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Re: [GMCnet] Brake shoe adjustment [message #322920 is a reply to message #322908] Tue, 29 August 2017 09:06 Go to previous messageGo to previous message
powerjon is currently offline  powerjon   United States
Messages: 2446
Registered: January 2004
Karma:
Senior Member
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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