Home » Public Forums » GMCnet » 80 mL Caliper Conversion Specifics
| 80 mL Caliper Conversion Specifics [message #351022] |
Sat, 28 December 2019 20:47  |
uprooted
Messages: 72
Registered: December 2019
Location: Hilliard, OH
Karma: 0
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I've got the calipers ground down and installed, and the rubber hoses test-fitted, but can't decide exactly how to bend the metal part of the lines to get them to work. When I look at the write up here https://www.gmcmotorhome.com/commodore/front_brake/index.html, It LOOKS like they bent the lines so that the banjo fitting is at a 90 degree angle from where it began. Can anyone confirm this and/or provide better or more specific photos?
Thanks in advance
Corey P /
Hilliard, OH /
1974 Glacier 26' /
3.70 FD /
ION Wheels
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| Re: 80 mL Caliper Conversion Specifics [message #351023 is a reply to message #351022] |
Sat, 28 December 2019 21:17  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Corey,
It has been many years since I did this conversion but I can guarantee you that I did not bend the lines 90 degrees. If I bent them at all, it was only slightly.
Do you possibly have the lines on the wrong sides? (Passenger vs. driver's side).
If you are talking about 90 degrees rotational when installing the banjo bolt, as I remember there is a nub on the cylinder that only allows you to install them in a certain orientation. Do you possibly have the calipers reversed? (passenger vs. Driver's side)
Sorry, It has been 15 years and I do not remember much about this, and I am not near my coach right now to go look.
Ken B.
Go Clemson
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] 80 mL Caliper Conversion Specifics [message #351025 is a reply to message #351023] |
Sat, 28 December 2019 21:22 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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The correct hose has combinsyy to ion steel and rubber. There it left and
right
On Sat, Dec 28, 2019 at 7:17 PM Ken Burton via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Corey,
>
> It has been many years since I did this conversion but I can guarantee you
> that I did not bend the lines 90 degrees. If I bent them at all, it was
> only slightly.
>
> Do you possibly have the lines on the wrong sides? (Passenger vs.
> driver's side).
>
> If you are talking about 90 degrees rotational when installing the banjo
> bolt, as I remember there is a nub on the cylinder that only allows you to
> install them in a certain orientation. Do you possibly have the calipers
> reversed? (passenger vs. Driver's side)
>
> Sorry, It has been 15 years and I do not remember much about this, and I
> am not near my coach right now to go look.
>
> Ken B.
>
> Go Clemson
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmcrvparts.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] 80 mL Caliper Conversion Specifics [message #351026 is a reply to message #351025] |
Sat, 28 December 2019 21:23 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Sorry, it is composed of steel and rubber left and right.
On Sat, Dec 28, 2019 at 7:22 PM Jim Kanomata wrote:
> The correct hose has combinsyy to ion steel and rubber. There it left and
> right
>
> On Sat, Dec 28, 2019 at 7:17 PM Ken Burton via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> Corey,
>>
>> It has been many years since I did this conversion but I can guarantee
>> you that I did not bend the lines 90 degrees. If I bent them at all, it was
>> only slightly.
>>
>> Do you possibly have the lines on the wrong sides? (Passenger vs.
>> driver's side).
>>
>> If you are talking about 90 degrees rotational when installing the banjo
>> bolt, as I remember there is a nub on the cylinder that only allows you to
>> install them in a certain orientation. Do you possibly have the calipers
>> reversed? (passenger vs. Driver's side)
>>
>> Sorry, It has been 15 years and I do not remember much about this, and I
>> am not near my coach right now to go look.
>>
>> Ken B.
>>
>> Go Clemson
>> --
>> Ken Burton - N9KB
>> 76 Palm Beach
>> Hebron, Indiana
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> --
> Jim Kanomata
> Applied/GMC, Newark,CA
> jimk@appliedairfilters.com
> http://www.appliedgmcrvparts.com
> 1-800-752-7502
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmcrvparts.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: 80 mL Caliper Conversion Specifics [message #351029 is a reply to message #351022] |
Sat, 28 December 2019 22:09 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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After thinking about it too much..... final answer was
To just get the lines where they need to be on the coach and it is easy to see how you need to bend them.
The biggest thing is how to mount the bracket to the a-arm and route the line. Just get in there and fit it up and you will see what has to happen. Small bend- maybe two trips back to the vice and back to re-fit to coach.
Make sure you file the casting edge on the knuckle itself. That is not documented well. The round part
Of the knuckle where the caliper sits, needs a little filing to clean up the casting. Caliper can rub there(was rubbing on a coach we did not do that to)
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: 80 mL Caliper Conversion Specifics [message #351032 is a reply to message #351022] |
Sun, 29 December 2019 07:44 |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
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Senior Member |
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I dont personally like bending prefab lines but if one must i would mount the line on the caliper, and carefully/limitedly bend the line to just clear what i need it too.....in my opinion you risk kinking the line if you try to get to gready with it.
One thing to keep in mind is you just need enough room to clear the ball joint nut...i wouldnt care if i had to remove the caliper to put the nut on or remove it.
Do the bend by hand, do not use plyers or the like....its probly not possible but if you could get a bending spring over the line it would help keep it from kinking...
Take your time and it might just work out.....YMMV and proceed at your own risk.
Rich Mondor,
Brockville, ON
77 Hughes 2600
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| Re: 80 mL Caliper Conversion Specifics [message #351037 is a reply to message #351022] |
Sun, 29 December 2019 08:30 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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What the pics show is totally different from what I have, I reversed the banjos. However, after looking, I'm going back and refitting them. I borrowed Zhookoff's pressure bleeder but it leaks at the seal. Inspection shows the rubber is creased here and there where it hits the edge of the master cylinder. A new rubber mat is in the offing tomorrow. Meantimes, I can run clear fluid forever out of the caliper bleed nipples, but no pedal. I suspect air in the master cylinder bores. Can the MC be bled on the coach? Take the lines off and fit the return tubes and pump till the bubbles if any go away? It's level, due to the front wheels are off and the cribbing is a bit low.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: 80 mL Caliper Conversion Specifics [message #351038 is a reply to message #351037] |
Sun, 29 December 2019 08:44 |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
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Senior Member |
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Yes it can....same way as a caliper....pump it up, hold pedal, open line....repeat on piston #2..then pump it up, hold etc...dont take the lines off or youll have air in the rest of the system.
Once you get a bit of a pedal move to bleeding the brakes....i always start the furthest away from the master, then opposing front, opposing back etc.....X pattern if possible to keep the propprtioning valve somewhat centered.
Johnny Bridges wrote on Sun, 29 December 2019 09:30What the pics show is totally different from what I have, I reversed the banjos. However, after looking, I'm going back and refitting them. I borrowed Zhookoff's pressure bleeder but it leaks at the seal. Inspection shows the rubber is creased here and there where it hits the edge of the master cylinder. A new rubber mat is in the offing tomorrow. Meantimes, I can run clear fluid forever out of the caliper bleed nipples, but no pedal. I suspect air in the master cylinder bores. Can the MC be bled on the coach? Take the lines off and fit the return tubes and pump till the bubbles if any go away? It's level, due to the front wheels are off and the cribbing is a bit low.
--johnny
Rich Mondor,
Brockville, ON
77 Hughes 2600
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| Re: 80 mL Caliper Conversion Specifics [message #351069 is a reply to message #351037] |
Mon, 30 December 2019 08:39 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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Johnny Bridges wrote on Sun, 29 December 2019 09:30<snip>
I suspect air in the master cylinder bores. Can the MC be bled on the coach? Take the lines off and fit the return tubes and pump till the bubbles if any go away? It's level, due to the front wheels are off and the cribbing is a bit low.
--johnny
Yes, it can. We(I) did this for my friend Greg last fall when we changed out his master cylinder because at least one seal had gone out. We were able to remove the old one, "bench bleed" the new one in place, and then carefully bleed the line at the master and he got pretty good brakes back right away.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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