Home » Public Forums » GMCnet » Brake shoe adjustment
| Re: [GMCnet] Brake shoe adjustment [message #322895 is a reply to message #322889] |
Mon, 28 August 2017 22:25   |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Agreed, however, since he had just replaced the shoes the logical assumption would be that it worked, unless he screwed up the
reassembly.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of John Phillips
Sent: Tuesday, August 29, 2017 12:46 PM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Brake shoe adjustment
That is if it still works.
*John Phillips*
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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] Brake shoe adjustment [message #322896 is a reply to message #322892] |
Mon, 28 August 2017 22:23 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Agreed, only mentioned it as we've got newbies who may or may not know that they do that.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Terry
Sent: Tuesday, August 29, 2017 1:10 PM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Brake shoe adjustment
Rob, he wanted the initial setup after rebuilding the brakes, according to the original post.
No one
--
Terry Kelpien
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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: Brake shoe adjustment [message #322908 is a reply to message #322810] |
Tue, 29 August 2017 06:58 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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http://www.gmcmhphotos.com/photos/g6385-how-i-adjust-brakes.html
Sir, after assembly tighten adjusters tight. This will center shoes. Then loosen adjuster till the wheel free spins and will ring when tapped with wrench. There will still be a tight spot, but should be slight.
The National seal is a double lip seal and I usually don't seat the seal in the hub below the lip and just flush with the outer lip.
Rule of thumb on bearings and wheel cylinders is if one is bad or questionable is replace them all. Makes sleeping more relaxing.
On the brake shoes use sevier duty bonded shoes and the short shoe is primary and goes to the front. Replace springs also. Make sure the emergency brake cable is retracted all the way and not holding against the shoes.
On the bearing adjustment, tighten to 35 ft lb to seat seal then loosen and re tighten by hand only till cotter key will go in. There are 2 different holes in spindle for half a hole sdjustment. Never replace bearing without replacing race.
McCohens wrote on Mon, 28 August 2017 08:43Sorry for not searching this first. but I am headed to the driveway to replace all 4 sets of brake shoes on my 76 eleganza II. A leaking cylinder in one has prompted the work, and the wheels are off anyway for the new tires.
The manual says tighten adjusters until there is drag then back off 30 clicks. This seems like a lot, I was thinking more like just until there is no or very slight drag. Any small amount of drag would get worn off in the first few miles. BUT drum brake adjustment is a new thing for me, so please contribute to my education. Will check back later, should be a few hours to do all 4 wheels.
TIA
Randy
C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] Brake shoe adjustment [message #322920 is a reply to message #322908] |
Tue, 29 August 2017 09:06 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Even though I always reassemble a drum brake package with the auto adjuster, I never trust it to properly adjust the drum brakes, because we very very rarely backup. I manually adjust the drum brakes on our coach. I have run all different brake combinations over the last 18 years including 6-wheel disk setups. 2 years ago I got with Dave Lenzi and I now run the same setup as Dave has on his coach. I have 80MM on the front, Lee Harrison 12 1/2” rotors and 80MM on the middle bogie and Drums with a 15/16 slave on the rears. I do around 10K miles a year and I adjust my rear bogie drums one in the spring and once in the fall. I do basically what Charles B. does to adjust the rear drums.
JR Wright
GMC Great Laker MHC
GMC Eastern States Charter Member
GMCGL Tech Editor
GMCMI
78 GMC Buskirk 30’ Stretch
1975 GMC Avion (Under Reconstruction)
Michigan
> On Aug 29, 2017, at 7:58 AM, Charles Boyd wrote:
>
> http://www.gmcmhphotos.com/photos/g6385-how-i-adjust-brakes.html
> Sir, after assembly tighten adjusters tight. This will center shoes. Then loosen adjuster till the wheel free spins and will ring when tapped with
> wrench. There will still be a tight spot, but should be slight.
> The National seal is a double lip seal and I usually don't seat the seal in the hub below the lip and just flush with the outer lip.
> Rule of thumb on bearings and wheel cylinders is if one is bad or questionable is replace them all. Makes sleeping more relaxing.
> On the brake shoes use sevier duty bonded shoes and the short shoe is primary and goes to the front. Replace springs also. Make sure the emergency
> brake cable is retracted all the way and not holding against the shoes.
> On the bearing adjustment, tighten to 35 ft lb to seat seal then loosen and re tighten by hand only till cotter key will go in. There are 2 different
> holes in spindle for half a hole sdjustment. Never replace bearing without replacing race.
>
>
>
> McCohens wrote on Mon, 28 August 2017 08:43
>> Sorry for not searching this first. but I am headed to the driveway to replace all 4 sets of brake shoes on my 76 eleganza II. A leaking cylinder
>> in one has prompted the work, and the wheels are off anyway for the new tires.
>> The manual says tighten adjusters until there is drag then back off 30 clicks. This seems like a lot, I was thinking more like just until there
>> is no or very slight drag. Any small amount of drag would get worn off in the first few miles. BUT drum brake adjustment is a new thing for me, so
>> please contribute to my education. Will check back later, should be a few hours to do all 4 wheels.
>> TIA
>> Randy
>
> --
> C. Boyd
> 76 Crestmont
> East Tennessee
>
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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: Brake shoe adjustment [message #322929 is a reply to message #322810] |
Tue, 29 August 2017 10:48 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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What Chuck Boyd said.
--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: Brake shoe adjustment [message #322940 is a reply to message #322810] |
Tue, 29 August 2017 13:12 |
McCohens
Messages: 22
Registered: March 2016
Location: Chalfont, PA
Karma: 0
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Junior Member |
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You guys have been invaluable on this project. Here is the status.
The bad cylinder ruined the brakes and probably the bearing seal. A total mess in that one. Another was starting, the paint was peeling off the brake shoe but no puddle.
Doing all 4 cylinders, and you are right I would always wonder if all 4 were not replaced.
Got the right seals, finally and am using speedbleeders on all 4. Currently waiting for the rain to stop and 2 speedbleeders to finish.
The lisle greaser looks real good. Got one, and can't wait to use it.
On the adjustment thing, I would like to get them set myself, but will see if the adjusters work once it is on the road.
Got new springs also, but some did not match up well. The main ones for return fit perfectly and went in. But my arms are rather sore today after fighting all those springs.
If this happens again the back will get all disks, I forgot how much I hated drum brakes!
Again thanks to all for your information. Looking forward to the first real drive in 10 years and being able to stop again.
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| Re: Brake shoe adjustment [message #322941 is a reply to message #322810] |
Tue, 29 August 2017 13:23 |
77Royale
Messages: 461
Registered: June 2014
Location: Mid Michigan
Karma: 6
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Senior Member |
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Good to hear. If its been off the road a decade, I would certainly bleed every last drop of old brake fluid out of there. While your at it, what do the rubber brake hoses look like? If they are original you know its time to change those out as well. One of those things where a job to change out a 10 dollar part ends up costing a few hundred and 20 other parts. But, they are your brakes.... No other component on the coach is more important.
77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson carb and dizzy.
Mid Michigan
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| Re: Brake shoe adjustment [message #322946 is a reply to message #322810] |
Tue, 29 August 2017 15:15 |
McCohens
Messages: 22
Registered: March 2016
Location: Chalfont, PA
Karma: 0
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Junior Member |
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Yes Hoses were replaced in ~99 and look very good. This will be the second time for a bleed, so the flow is good and the fluid looks decent.
Already did the fuel lines, tanks were very clean inside. Way cleaner than they should have been, compared to other old cars I have had.
I am very lucky, so far. Engine has no leaks, coolant was nice and bright green but the thermostat was frozen. Compression is about 160 across the board. Tested roof AC, fridge, water system and all were good. I will do the water heater coolant lines, as they were not cracked but seemed a little soft.
If I am lucky the only remaining expense is a passenger side windshield, the crack is huge and has been growing over the last few years even with the coach sitting.
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| Re: [GMCnet] Brake shoe adjustment [message #322950 is a reply to message #322940] |
Tue, 29 August 2017 15:39 |
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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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Randy,
I would highly recommend you use Valvoline Synpower in the Lisle bearing greaser. In fact I'd use it on everything that needs
greasing EXCEPT the front wheel bearings IF you have zerk fittings to grease the bearings installed in the knuckles, then use Mobil
1.
The reason I say that is because you can see the color of the grease change from a ruddy brown to a bright red when the bearings are
full of fresh grease.
Having noted that there could be a change in the color of Valvoline, however, since I don't run it I can not speak from experience.
Yes, Valvoline Synpower (and Mobil 1) is "expensive" when compared to other grease, however, when compared to the costs associated
with bearing failures it's a no brainer.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Randy Cohen/Catherine McGinley
Sent: Wednesday, August 30, 2017 4:12 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Brake shoe adjustment
You guys have been invaluable on this project. Here is the status.
The bad cylinder ruined the brakes and probably the bearing seal. A total mess in that one. Another was starting, the paint was
peeling off the
brake shoe but no puddle.
Doing all 4 cylinders, and you are right I would always wonder if all 4 were not replaced.
Got the right seals, finally and am using speedbleeders on all 4. Currently waiting for the rain to stop and 2 speedbleeders to
finish.
The lisle greaser looks real good. Got one, and can't wait to use it.
On the adjustment thing, I would like to get them set myself, but will see if the adjusters work once it is on the road.
Got new springs also, but some did not match up well. The main ones for return fit perfectly and went in. But my arms are rather
sore today after
fighting all those springs.
If this happens again the back will get all disks, I forgot how much I hated drum brakes!
Again thanks to all for your information. Looking forward to the first real drive in 10 years and being able to stop again.
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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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