Home » Public Forums » GMCnet » [GMCnet] Disk Brakes Install
| [GMCnet] Disk Brakes Install [message #189469] |
Wed, 07 November 2012 13:15  |
Gary Berry
Messages: 1002
Registered: May 2005
Karma: -1
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Senior Member |
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Hey All;
Just finished installing the disk brake setup for the rear of the
Stretch. I came in with very good OEM brakes and now I hardly have
any. I've bled the lines a number of times. I have adjusted up the
e-brake on the rear calipers and they appear to be working fine, but I
still have very little brake when I move the coach. With the engine
off, and I touch the brakes, there appears to be plenty of pedal and
the feel is firm. When I start the coach and I have my foot on the
pedal, the pedal moves about half way down it's stroke. As I push
harder on the pedal, it appears to go to the internal stop of the
master cylinder. Now I've always had good brakes. The last 750 miles
I've had superb brakes. So, is the stock MC not able to supply enough
fluid to the 4 new calipers? If not, is there another MC I should be
looking at? How come the pedal is full up with the engine off but goes
to half stroke when it is on? Is it a brake bleeding issue? Thanks for
any help.
--
Gary and Diana Berry
73 CL Stretch in Wa.
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| Re: [GMCnet] Disk Brakes Install [message #189470 is a reply to message #189469] |
Wed, 07 November 2012 13:29  |
Dwayne
Messages: 418
Registered: October 2007
Location: White Rock BC
Karma: 0
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HI Gary;
I too had the rear drums changed with Disc's installed including the
reaction arms and Sway bars.
This was done by Jim Hupy with a little of my help (grunt work). I was
told it takes between 500 and 1000 miles
to break the pads in. Well I drove home approx 400 miles and braking got
better as we went. I still have in the
original MC and will replace it with the one provided with the Jim K kit.
The new one is larger.
Also will be adding a new Booster that is supposed to give a softer pedal.
Also got the Line Lock
system for parking. I tore out the original parking brake cables.
I also have the Manny 1-ton front end with larger disc's.
On our recent 14,500 mile trip I figure I drove more than 1500 miles with
front brakes only
and that included our trip through the Bronx and New York City - (Park Ave,
Broadway, thru the Met Life Bldg
and finalizing with a Forbidden trip thru the Holland Tunnel to Jersey
City.)
Regards
Dwayne JAcobson
White Rock, BC
77 Kingsley
On Wed, Nov 7, 2012 at 11:15 AM, Gary Berry <duallycc@gmail.com> wrote:
> Hey All;
>
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Dwayne & Sharon Jacobson
White Rock, BC
77 Eleganza II
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| Re: [GMCnet] Disk Brakes Install [message #189476 is a reply to message #189474] |
Wed, 07 November 2012 14:09 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Gary, resist the urge to really use the brakes hard, but don't be gentle,
they will perform better when the metallic linings are broken in. It is
normal for metallics to perform better when they are warm. As far as pedal
goes, if it feels spongy, you likely still have some air lurking in there
somewhere. Look at your calipers and be sure that the bleeder fittings are
at the 12:00 o'clock position when installed. If they are not, they are
likely switched side to side. The casting marks on the calipers say L and R
but that is for rear hung calipers. Your front hung caliper brackets need
the calipers swapped side to side so the bleeder are up. Yes the p30 mc has
increased volume to handle the discs, and should be used. Also, the disc
brake equalizing valve is recommended.
Jim Hupy
Salem, Or
On Nov 7, 2012 11:46 AM, "Gary Berry" <duallycc@gmail.com> wrote:
> Hey Dwayne;
>
> Thanks for the info. Were your initial symptoms the same as mine? I
> can stop, but not very good, and the pedal is at the end of it's
> stroke. It keeps moving, but slows gradually. If I have to wait for
> the pads to break in, I guess I can do it. I still have another 750
> miles to go before I get home.
>
> Gary and Diana Berry
> 73 CL Stretch in Ca.
>
>
> On Wed, Nov 7, 2012 at 11:29 AM, Dwayne Jacobson
> <dwayne@havenproperties.ca> wrote:
> > HI Gary;
> > I too had the rear drums changed with Disc's installed including the
> > reaction arms and Sway bars.
> > Dwayne JAcobson
> _______________________________________________
> GMCnet mailing list
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| Re: [GMCnet] Disk Brakes Install [message #189490 is a reply to message #189469] |
Wed, 07 November 2012 17:37 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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Gary,
I installed the Harrison system on the second axle. It seems to me that on these aftermarket systems, that upon install, the pads are not perfectly parallel with the discs, so it takes some time for the pads to wear parallel to the discs. While you are wearing the pads in, the system is bending some because of the lack of parallelism. (is that a word?) That makes the pedal feel spongy...like it has air in the system. Before you install the discs, you must take a 80 grit paper and a DA sander and scratch the shit out of both sides of the discs. This will assist in the bedding of the pads. When I first stepped on the brakes, I had almost nothing. I went out and hit the brakes hard for several hard stops. The brake light came on every time. Things got better, so I did it some more. Finally got it to a point that I could drive it 40 miles home. Now the more I drive it, the better the brakes get, and the brakes are quite a bit better than the drum system that I had. Be patient, and use the brakes hard. They get much better...
| Gary Berry wrote on Wed, 07 November 2012 13:15 |
Hey All;
Just finished installing the disk brake setup for the rear of the
Stretch. I came in with very good OEM brakes and now I hardly have
any. I've bled the lines a number of times. I have adjusted up the
e-brake on the rear calipers and they appear to be working fine, but I
still have very little brake when I move the coach. With the engine
off, and I touch the brakes, there appears to be plenty of pedal and
the feel is firm. When I start the coach and I have my foot on the
pedal, the pedal moves about half way down it's stroke. As I push
harder on the pedal, it appears to go to the internal stop of the
master cylinder. Now I've always had good brakes. The last 750 miles
I've had superb brakes. So, is the stock MC not able to supply enough
fluid to the 4 new calipers? If not, is there another MC I should be
looking at? How come the pedal is full up with the engine off but goes
to half stroke when it is on? Is it a brake bleeding issue? Thanks for
any help.
--
Gary and Diana Berry
73 CL Stretch in Wa.
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Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] Disk Brakes Install [message #189501 is a reply to message #189490] |
Wed, 07 November 2012 18:30 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Larry,
When I rebuilt the brake system on Double Trouble I used Carbon Metallic brake pads in the front and middle wheel calipers at the
recommendation of Dave Lenzi.
He instructed me to sand the disks as you have noted below to clean out the pores in the cast iron. He noted that material would
transfer from the pads to the disks which would greatly reduce the wear of the disks. Since GM was very generous in allowing the
1.120 inch thick disk to wear down to 1.17 (0.030) before it had to be replaced.
People that have driven Double Trouble are impressed with its braking even though it still has drums on the rear.
Regards,
Rob M.
-----Original Message-----
From: Larry
Gary,
I installed the Harrison system on the second axle. It seems to me that on these aftermarket systems, that upon install, the pads
are not perfectly parallel with the discs, so it takes some time for the pads to wear parallel to the discs. While you are wearing
the pads in, the system is bending some because of the lack of parallelism. (is that a word?) That makes the pedal feel
spongy...like it has air in the system. Before you install the discs, you must take a 80 grit paper and a DA sander and scratch the
shit out of both sides of the discs. This will assist in the bedding of the pads. When I first stepped on the brakes, I had almost
nothing. I went out and hit the brakes hard for several hard stops. The brake light came on every time. Things got better, so I did
it some more. Finally got it to a point that I could drive it 40 miles home. Now the more I drive it, the better the brakes get,
and the brakes are quite a bit better than the drum system that I had. Be patient, and use the brakes hard. They get much better...
Larry :)
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Disk Brakes Install [message #189508 is a reply to message #189470] |
Wed, 07 November 2012 18:50 |
lonestranger
Messages: 35
Registered: October 2012
Location: Bradenton FL
Karma: 0
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Member |
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| Dwayne wrote on Wed, 07 November 2012 14:29 |
HI Gary;
I too had the rear drums changed with Disc's installed including the
reaction arms and Sway bars.
This was done by Jim Hupy with a little of my help (grunt work). I was
told it takes between 500 and 1000 miles
to break the pads in. Well I drove home approx 400 miles and braking got
better as we went. I still have in the
original MC and will replace it with the one provided with the Jim K kit.
The new one is larger.
Also will be adding a new Booster that is supposed to give a softer pedal.
Also got the Line Lock
system for parking. I tore out the original parking brake cables.
I also have the Manny 1-ton front end with larger disc's.
On our recent 14,500 mile trip I figure I drove more than 1500 miles with
front brakes only
and that included our trip through the Bronx and New York City - (Park Ave,
Broadway, thru the Met Life Bldg
and finalizing with a Forbidden trip thru the Holland Tunnel to Jersey
City.)
Regards
Dwayne JAcobson
White Rock, BC
77 Kingsley
On Wed, Nov 7, 2012 at 11:15 AM, Gary Berry <duallycc@gmail.com> wrote:
> Hey All;
>
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One consideration I might point out relative to the line lock system, at least on those I have looked at, is that they are only for a parking brake, as opposed to also a backup brake system, as is the case with "mechanical" parking/emergency brakes on the calipers. This is due to the fact that the mastercylinder/brakes must be functional to engage the line lock, whereas the mechanical caliper brake is cable activated. (In fact, at one time, I believe the DOT did not accept them as approved parking brakes for that reason.) I mention this as several years ago (on the way to Flagstaff, for a Corsa Convention), as I got off the interstate with the PB,while trailering our 66 Monza, our new MC failed and luckily everyone in front of us was making a left turn; as I made a brakeless 30mph right turn at the bottom of the ramp, before I was able to get the "Green Hornet" stopped!! This was with a dual chamber MC. Just a thought.
[Updated on: Wed, 07 November 2012 19:01] Report message to a moderator |
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| Re: [GMCnet] Disk Brakes Install [message #189541 is a reply to message #189501] |
Wed, 07 November 2012 20:45 |
Kosier
Messages: 834
Registered: February 2008
Karma: 1
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Senior Member |
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Rob,
Look at those numbers again and check your math. Actually, the math is
good, the numbers are not.
Gary Kosier
-----Original Message-----
From: Rob Mueller
Sent: Wednesday, November 07, 2012 7:33 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Disk Brakes Install
Larry,
When I rebuilt the brake system on Double Trouble I used Carbon Metallic
brake pads in the front and middle wheel calipers at the
recommendation of Dave Lenzi.
He instructed me to sand the disks as you have noted below to clean out the
pores in the cast iron. He noted that material would
transfer from the pads to the disks which would greatly reduce the wear of
the disks. Since GM was very generous in allowing the
1.120 inch thick disk to wear down to 1.17 (0.030) before it had to be
replaced.
People that have driven Double Trouble are impressed with its braking even
though it still has drums on the rear.
Regards,
Rob M.
-----Original Message-----
From: Larry
Gary,
I installed the Harrison system on the second axle. It seems to me that on
these aftermarket systems, that upon install, the pads
are not perfectly parallel with the discs, so it takes some time for the
pads to wear parallel to the discs. While you are wearing
the pads in, the system is bending some because of the lack of parallelism.
(is that a word?) That makes the pedal feel
spongy...like it has air in the system. Before you install the discs, you
must take a 80 grit paper and a DA sander and scratch the
shit out of both sides of the discs. This will assist in the bedding of the
pads. When I first stepped on the brakes, I had almost
nothing. I went out and hit the brakes hard for several hard stops. The
brake light came on every time. Things got better, so I did
it some more. Finally got it to a point that I could drive it 40 miles
home. Now the more I drive it, the better the brakes get,
and the brakes are quite a bit better than the drum system that I had. Be
patient, and use the brakes hard. They get much better...
Larry :)
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| Re: [GMCnet] Disk Brakes Install [message #189546 is a reply to message #189541] |
Wed, 07 November 2012 21:02 |
mickeysss
Messages: 1476
Registered: January 2012
Karma: 0
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Senior Member |
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for brake pads i use ceramic pads they do not smell as bad and they last longer on all my vans.
mickey
77 palm beach
if i get pads for the gmc i would look for these. What is the pad part number for ceramic pads or the metallic pads?
On Nov 7, 2012, at 6:45 PM, Kosier wrote:
> Rob,
>
> Look at those numbers again and check your math. Actually, the math is
> good, the numbers are not.
>
> Gary Kosier
>
> -----Original Message-----
> From: Rob Mueller
> Sent: Wednesday, November 07, 2012 7:33 PM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Disk Brakes Install
>
> Larry,
>
> When I rebuilt the brake system on Double Trouble I used Carbon Metallic
> brake pads in the front and middle wheel calipers at the
> recommendation of Dave Lenzi.
>
> He instructed me to sand the disks as you have noted below to clean out the
> pores in the cast iron. He noted that material would
> transfer from the pads to the disks which would greatly reduce the wear of
> the disks. Since GM was very generous in allowing the
> 1.120 inch thick disk to wear down to 1.17 (0.030) before it had to be
> replaced.
>
> People that have driven Double Trouble are impressed with its braking even
> though it still has drums on the rear.
>
> Regards,
> Rob M.
>
> -----Original Message-----
> From: Larry
>
> Gary,
>
> I installed the Harrison system on the second axle. It seems to me that on
> these aftermarket systems, that upon install, the pads
> are not perfectly parallel with the discs, so it takes some time for the
> pads to wear parallel to the discs. While you are wearing
> the pads in, the system is bending some because of the lack of parallelism.
> (is that a word?) That makes the pedal feel
> spongy...like it has air in the system. Before you install the discs, you
> must take a 80 grit paper and a DA sander and scratch the
> shit out of both sides of the discs. This will assist in the bedding of the
> pads. When I first stepped on the brakes, I had almost
> nothing. I went out and hit the brakes hard for several hard stops. The
> brake light came on every time. Things got better, so I did
> it some more. Finally got it to a point that I could drive it 40 miles
> home. Now the more I drive it, the better the brakes get,
> and the brakes are quite a bit better than the drum system that I had. Be
> patient, and use the brakes hard. They get much better...
>
> Larry :)
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] Disk Brakes Install [message #189554 is a reply to message #189546] |
Wed, 07 November 2012 21:35 |
Dwayne
Messages: 418
Registered: October 2007
Location: White Rock BC
Karma: 0
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Senior Member |
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We just finished a 14500 mile trip.
Had rear brake failure somewhere in the Maritimes. Drove thru Boston,
Bronx, New York, Jersey City using front brakes only. Finally in Gettysburg
had all rear shoes, bearings and cylinders replaced.
Drove down to New Orleans then across lower Texas then noticed more
difficulty in stopping.
To be cont.
Dwayne
White Rock
77 Kingsley
On 2012-11-07 7:00 PM, "Mickey Space Ship Shuttle" <mickeysss@me.com> wrote:
> for brake pads i use ceramic pads they do not smell as bad and they last
> longer on all my vans.
>
> mickey
>
> 77 palm beach
>
> if i get pads for the gmc i would look for these. What is the pad part
> number for ceramic pads or the metallic pads?
>
>
>
>
>
> On Nov 7, 2012, at 6:45 PM, Kosier wrote:
>
> > Rob,
> >
> > Look at those numbers again and check your math. Actually, the math is
> > good, the numbers are not.
> >
> > Gary Kosier
> >
> > -----Original Message-----
> > From: Rob Mueller
> > Sent: Wednesday, November 07, 2012 7:33 PM
> > To: gmclist@temp.gmcnet.org
> > Subject: Re: [GMCnet] Disk Brakes Install
> >
> > Larry,
> >
> > When I rebuilt the brake system on Double Trouble I used Carbon Metallic
> > brake pads in the front and middle wheel calipers at the
> > recommendation of Dave Lenzi.
> >
> > He instructed me to sand the disks as you have noted below to clean out
> the
> > pores in the cast iron. He noted that material would
> > transfer from the pads to the disks which would greatly reduce the wear
> of
> > the disks. Since GM was very generous in allowing the
> > 1.120 inch thick disk to wear down to 1.17 (0.030) before it had to be
> > replaced.
> >
> > People that have driven Double Trouble are impressed with its braking
> even
> > though it still has drums on the rear.
> >
> > Regards,
> > Rob M.
> >
> > -----Original Message-----
> > From: Larry
> >
> > Gary,
> >
> > I installed the Harrison system on the second axle. It seems to me that
> on
> > these aftermarket systems, that upon install, the pads
> > are not perfectly parallel with the discs, so it takes some time for the
> > pads to wear parallel to the discs. While you are wearing
> > the pads in, the system is bending some because of the lack of
> parallelism.
> > (is that a word?) That makes the pedal feel
> > spongy...like it has air in the system. Before you install the discs,
> you
> > must take a 80 grit paper and a DA sander and scratch the
> > shit out of both sides of the discs. This will assist in the bedding of
> the
> > pads. When I first stepped on the brakes, I had almost
> > nothing. I went out and hit the brakes hard for several hard stops. The
> > brake light came on every time. Things got better, so I did
> > it some more. Finally got it to a point that I could drive it 40 miles
> > home. Now the more I drive it, the better the brakes get,
> > and the brakes are quite a bit better than the drum system that I had. Be
> > patient, and use the brakes hard. They get much better...
> >
> > Larry :)
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Dwayne & Sharon Jacobson
White Rock, BC
77 Eleganza II
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| Re: [GMCnet] Disk Brakes Install [message #189555 is a reply to message #189554] |
Wed, 07 November 2012 21:42 |
Dwayne
Messages: 418
Registered: October 2007
Location: White Rock BC
Karma: 0
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Senior Member |
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Got to Phoenix . Could not touch 2 rear drums Super Hot. Felt drag thru
pedal and noise coming ftom rear. Took drums off. Parts of shoe system fell
out. Damaged drum. Removed one whole system on pass.RR drum and drove with
3 rear brakes to Salem Oregon.
On the whole trip I only had 1 time I got cut off and had to hammer on the
pedal. Stopped before making a crush job on the guys car.
Dwayne
White Rock
77 Kingsley
On 2012-11-07 7:35 PM, "Dwayne Jacobson" <dwayne@havenproperties.ca> wrote:
> We just finished a 14500 mile trip.
> Had rear brake failure somewhere in the Maritimes. Drove thru Boston,
> Bronx, New York, Jersey City using front brakes only. Finally in Gettysburg
> had all rear shoes, bearings and cylinders replaced.
> Drove down to New Orleans then across lower Texas then noticed more
> difficulty in stopping.
> To be cont.
> Dwayne
> White Rock
> 77 Kingsley
> On 2012-11-07 7:00 PM, "Mickey Space Ship Shuttle" <mickeysss@me.com>
> wrote:
>
>> for brake pads i use ceramic pads they do not smell as bad and they last
>> longer on all my vans.
>>
>> mickey
>>
>> 77 palm beach
>>
>> if i get pads for the gmc i would look for these. What is the pad part
>> number for ceramic pads or the metallic pads?
>>
>>
>>
>>
>>
>> On Nov 7, 2012, at 6:45 PM, Kosier wrote:
>>
>> > Rob,
>> >
>> > Look at those numbers again and check your math. Actually, the math is
>> > good, the numbers are not.
>> >
>> > Gary Kosier
>> >
>> > -----Original Message-----
>> > From: Rob Mueller
>> > Sent: Wednesday, November 07, 2012 7:33 PM
>> > To: gmclist@temp.gmcnet.org
>> > Subject: Re: [GMCnet] Disk Brakes Install
>> >
>> > Larry,
>> >
>> > When I rebuilt the brake system on Double Trouble I used Carbon Metallic
>> > brake pads in the front and middle wheel calipers at the
>> > recommendation of Dave Lenzi.
>> >
>> > He instructed me to sand the disks as you have noted below to clean out
>> the
>> > pores in the cast iron. He noted that material would
>> > transfer from the pads to the disks which would greatly reduce the wear
>> of
>> > the disks. Since GM was very generous in allowing the
>> > 1.120 inch thick disk to wear down to 1.17 (0.030) before it had to be
>> > replaced.
>> >
>> > People that have driven Double Trouble are impressed with its braking
>> even
>> > though it still has drums on the rear.
>> >
>> > Regards,
>> > Rob M.
>> >
>> > -----Original Message-----
>> > From: Larry
>> >
>> > Gary,
>> >
>> > I installed the Harrison system on the second axle. It seems to me that
>> on
>> > these aftermarket systems, that upon install, the pads
>> > are not perfectly parallel with the discs, so it takes some time for the
>> > pads to wear parallel to the discs. While you are wearing
>> > the pads in, the system is bending some because of the lack of
>> parallelism.
>> > (is that a word?) That makes the pedal feel
>> > spongy...like it has air in the system. Before you install the discs,
>> you
>> > must take a 80 grit paper and a DA sander and scratch the
>> > shit out of both sides of the discs. This will assist in the bedding
>> of the
>> > pads. When I first stepped on the brakes, I had almost
>> > nothing. I went out and hit the brakes hard for several hard stops. The
>> > brake light came on every time. Things got better, so I did
>> > it some more. Finally got it to a point that I could drive it 40 miles
>> > home. Now the more I drive it, the better the brakes get,
>> > and the brakes are quite a bit better than the drum system that I had.
>> Be
>> > patient, and use the brakes hard. They get much better...
>> >
>> > Larry :)
>> >
>> > _______________________________________________
>> > GMCnet mailing list
>> > Unsubscribe or Change List Options:
>> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>> >
>> > _______________________________________________
>> > GMCnet mailing list
>> > Unsubscribe or Change List Options:
>> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>
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Dwayne & Sharon Jacobson
White Rock, BC
77 Eleganza II
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| Re: [GMCnet] Disk Brakes Install [message #189564 is a reply to message #189506] |
Wed, 07 November 2012 22:22 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Garry,
The one that I and others have used in the last few years on the GMC
is an AutoZone part#M1668. Also you will need to swap the lines for
the front and rear on the master cylinder.
http://www.gmcmhphotos.com/photos/cadilac-disk-brakes/p3729.html
JR Wright
78 Buskirk Stretch
Michigan
> Hey Guys;
>
> If I do need the P30 MC, do I need to use a special rod for the
> Booster? Where can I get the P30 MC? Are they readily available at
> Napa, AZ, or O'Reillys? Thanks...
>
> Gary and Diana Berry
> 73 CL Stretch in Wa.
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] Disk Brakes Install [message #189571 is a reply to message #189541] |
Wed, 07 November 2012 23:59 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Gary,
Douh!
The disk is 1.20" thick NOT 1.120"!
1.20" - 1.17" = 0.030"!
Regards,
Rob M.
-----Original Message-----
From: Kosier
Rob,
Look at those numbers again and check your math. Actually, the math is
good, the numbers are not.
Gary Kosier
-----Original Message-----
From: Rob Mueller
Larry,
When I rebuilt the brake system on Double Trouble I used Carbon Metallic
brake pads in the front and middle wheel calipers at the
recommendation of Dave Lenzi.
He instructed me to sand the disks as you have noted below to clean out the
pores in the cast iron. He noted that material would
transfer from the pads to the disks which would greatly reduce the wear of
the disks. Since GM was very generous in allowing the
1.120 inch thick disk to wear down to 1.17 (0.030) before it had to be
replaced.
People that have driven Double Trouble are impressed with its braking even
though it still has drums on the rear.
Regards,
Rob M.
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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