Home » Public Forums » GMCnet » Brake shoe adjustment
Brake shoe adjustment [message #322810] |
Mon, 28 August 2017 07:43 |
McCohens
Messages: 22 Registered: March 2016 Location: Chalfont, PA
Karma: 0
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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
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Re: Brake shoe adjustment [message #322811 is a reply to message #322810] |
Mon, 28 August 2017 07:50 |
77Royale
Messages: 461 Registered: June 2014 Location: Mid Michigan
Karma: 6
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Id tighten until it starts to drag and back off a few clicks. While your in there, Id clean and pack each bearing if it hasn't been done in a while. Mobil 1 or Synpower.
The smaller (less friction material) of the two shoes goes FORWARD.
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 #322817 is a reply to message #322810] |
Mon, 28 August 2017 08:21 |
jhbridges
Messages: 8412 Registered: May 2011 Location: Braselton ga
Karma: -74
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There's a test for those seals. On a flat surface, you should be able to pass a drill bit (1/4"? Someone help me here) betwee nthe seal material and the surface. Sometimes you are given seals with the sealing face too close to the side of the seal away from the bearing. Those have problems sealing properly.
--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 #322818 is a reply to message #322810] |
Mon, 28 August 2017 08:26 |
77Royale
Messages: 461 Registered: June 2014 Location: Mid Michigan
Karma: 6
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Senior Member |
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SKF 21771 is the seal, I have found correct ones from Napa. (while your there pick up a bearing packer) That makes the job a bit better.
Yes, 1/4 inch drill bit or flat stock that will fit inside the inner part of the seal.
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 #322819 is a reply to message #322810] |
Mon, 28 August 2017 08:34 |
JohnL455
Messages: 4447 Registered: October 2006 Location: Woodstock, IL
Karma: 12
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Be sure you understand the wheel bearing adjustment sequence involving a torque wrench to seat and then the loosening, finger tightening and pinning procedure. A Lisle bearing bench greaser is a nice tool to have.
John Lebetski
Woodstock, IL
77 Eleganza II
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Re: Brake shoe adjustment [message #322821 is a reply to message #322810] |
Mon, 28 August 2017 08:37 |
JohnL455
Messages: 4447 Registered: October 2006 Location: Woodstock, IL
Karma: 12
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Important is after finger tightening, if no holes line up, loosen to the next alternate hole do not tighten. Note where the holes are before nutting and how they alternate.
John Lebetski
Woodstock, IL
77 Eleganza II
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Re: Brake shoe adjustment [message #322822 is a reply to message #322815] |
Mon, 28 August 2017 08:53 |
Bullitthead
Messages: 1411 Registered: November 2013
Karma: 5
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Put a spare wheel and tire on with a couple of nuts and get a helper to spin the wheel while you adjust if you can. With or without the helper, when properly adjusted the wheel will spin (freewheel)just less than 1 full turn after you stop trying to keep it spinning. Then go and apply the brake and release and check the free spin again. You will probably then get to adjust it up 3-5 clicks to get it just right. If they are new brake shoes, you will have to repeat this last adjustment after several stops. If your self-adjusters work properly, you shouldn't have to repeat the last adjustment if you back up and stop several times, hard enough to make them work.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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Re: Brake shoe adjustment [message #322832 is a reply to message #322810] |
Mon, 28 August 2017 11:00 |
jhbridges
Messages: 8412 Registered: May 2011 Location: Braselton ga
Karma: -74
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I got four seals from Advance, they had to order two of them. All four had the same number stamped in the metal part. First two were Federal, second two weren't. Only difference - the Federal ones had an orange sealer painted on the contact surface of the seal housing while the others didn't. Until I put some sealer on them as well.
--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 #322849 is a reply to message #322810] |
Mon, 28 August 2017 14:50 |
77Royale
Messages: 461 Registered: June 2014 Location: Mid Michigan
Karma: 6
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Senior Member |
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Since your already into the wheel cylinders, take a moment to put a few careful wraps of teflon tape on the bleeder screws. You will thank yourself for it then next time you have to bleed the system.. (and cudos to Matt C for passing the info on)
77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson carb and dizzy.
Mid Michigan
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Re: [GMCnet] Brake shoe adjustment [message #322855 is a reply to message #322825] |
Mon, 28 August 2017 15:10 |
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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,
Here you go:
http://www.gmcmhphotos.com/photos/rear-axle-seals-skf21771/p36356-says-made-in-the-usa.html
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: Tuesday, August 29, 2017 12:30 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Brake shoe adjustment
OK, go the packer and grease, mid cylinders and seals, but I think the seals are wrong. They don't carry SKF sold me National
8974S. The lip of the
seal to the edge of the metal is .240 but the dimension from the lip to the flat side(outer) is .260
Are these OK or do I have to keep hunting. My parts guy, who is pretty good, said SKF 21771 is NLA. Maybe just for him though.
Shoes are new, so I am not too concerned about adjustment initially. They will need to bed to the drums and further adjustment is
planned. Looking
forward to being able to stop this beast.
Just did master cylinder and prop vales, new fuel lines and tires. After a 10 year nap we are getting close to hitting the road
again. Maybe...
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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 #322856 is a reply to message #322825] |
Mon, 28 August 2017 15:18 |
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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 just thought of something that no one has mentioned, the rear brake shoes adjust themselves automatically whenever you backup and
hit the brakes. You could go to a large parking lot and back up and stop repeatedly until they're adjusted.
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: Tuesday, August 29, 2017 12:30 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Brake shoe adjustment
OK, go the packer and grease, mid cylinders and seals, but I think the seals are wrong. They don't carry SKF sold me National
8974S. The lip of the
seal to the edge of the metal is .240 but the dimension from the lip to the flat side(outer) is .260
Are these OK or do I have to keep hunting. My parts guy, who is pretty good, said SKF 21771 is NLA. Maybe just for him though.
Shoes are new, so I am not too concerned about adjustment initially. They will need to bed to the drums and further adjustment is
planned. Looking
forward to being able to stop this beast.
Just did master cylinder and prop vales, new fuel lines and tires. After a 10 year nap we are getting close to hitting the road
again. Maybe...
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Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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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 #322889 is a reply to message #322856] |
Mon, 28 August 2017 21:45 |
johnd01
Messages: 354 Registered: July 2017 Location: Sacrameot
Karma: -1
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Senior Member |
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That is if it still works.
On Mon, Aug 28, 2017 at 1:18 PM, Rob Mueller
wrote:
> Randy,
>
> I just thought of something that no one has mentioned, the rear brake
> shoes adjust themselves automatically whenever you backup and
> hit the brakes. You could go to a large parking lot and back up and stop
> repeatedly until they're adjusted.
>
> 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: Tuesday, August 29, 2017 12:30 AM
> To: gmclist@list.gmcnet.org
> Subject: Re: [GMCnet] Brake shoe adjustment
>
> OK, go the packer and grease, mid cylinders and seals, but I think the
> seals are wrong. They don't carry SKF sold me National
> 8974S. The lip of the
> seal to the edge of the metal is .240 but the dimension from the lip to
> the flat side(outer) is .260
> Are these OK or do I have to keep hunting. My parts guy, who is pretty
> good, said SKF 21771 is NLA. Maybe just for him though.
> Shoes are new, so I am not too concerned about adjustment initially. They
> will need to bed to the drums and further adjustment is
> planned. Looking
> forward to being able to stop this beast.
> Just did master cylinder and prop vales, new fuel lines and tires. After
> a 10 year nap we are getting close to hitting the road
> again. Maybe...
>
> _______________________________________________
> 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
>
--
*John Phillips*
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Johnd01
John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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