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#761319 07/10/2011 9:28 PM
Joined: Apr 2011
Posts: 174
J
Wrench Fetcher
Wrench Fetcher
J Offline
Joined: Apr 2011
Posts: 174
So im now onto the brake stage... i've never ever done anything with drum brakes. I'm familiar with disc brakes but this is all new here.

Any advice? ive got my rear tires off curently

Joined: Jun 2004
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W
Riding in the Passing Lane
Riding in the Passing Lane
W Offline
Joined: Jun 2004
Posts: 8,597
I take it it is a 1/2 ton. Get a good pair of brake spring pliers. Do one side at a time so you can use the other for reference. O-haul or replace the wheel cyl. If there is any signs of grease from the axle replace the axle seals. These are pretty basic & simple.


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
In the Gallery Forum
Joined: Apr 2011
Posts: 174
J
Wrench Fetcher
Wrench Fetcher
J Offline
Joined: Apr 2011
Posts: 174
its actually a 1 ton... is it any more complicated than a 1/2 ton or 3/4?
Ive realized most vendors only sell brake parts up to 3/4 ton

Joined: Apr 2011
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J
Wrench Fetcher
Wrench Fetcher
J Offline
Joined: Apr 2011
Posts: 174
So i took off one drum (the other was already off) and took a couple of pics... i don't even know where to begin
Driver's rear
Again
Passenger's rear
Again

Last edited by Josh_51GMC; 07/11/2011 12:03 AM.
Joined: Mar 2002
Posts: 9,115
'Bolter
'Bolter
Joined: Mar 2002
Posts: 9,115
I would start with the shop manual. I have a 1 Ton with the same brakes and when they are restored, they work great. I would take lots of photos as you take them apart and try to save everything.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
Joined: Apr 2011
Posts: 174
J
Wrench Fetcher
Wrench Fetcher
J Offline
Joined: Apr 2011
Posts: 174
I completely forgot to mention that the brakes are shot, im going to start with an overhaul of the master cylinder, but i dont know what to look for... also the passenger side rear is seized which is why the PO took the drum off

Joined: Sep 2010
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B
Shop Shark
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Joined: Sep 2010
Posts: 575
Josh,

Like Truckernix said - the shop manual is pretty descriptive.

Master cylinder comes apart fairly easy in a vise. Once its opened and you've removed the plunger etc, you can inspect the cylinder walls for pitting. Pitting is bad - There are options for honing / sleeve - or you could just replace the whole thing for just over $100. A rebuild kit is available from most vendors for cheap.

ALL my brakes were seized when I got my truck, and the neighbors got to hear some choice language as I removed the drums! I ended up buying all new wheel cylinders.

Finally - yes, you won't find rear 1-ton drums very easily. My guy machined them lightly to try and preserve them. If you can find some in a yard - grab em.

My brake work here... http://1949chevy.com/index.php/brakes/

Good luck

Joined: Feb 2003
Posts: 452
H
Shop Shark
Shop Shark
H Offline
Joined: Feb 2003
Posts: 452
Those are Huck brakes. Pre-Bendix. harder to find parts, but work well. NOT self adjusting, and both ends of the wheel cylinder need to be adjusted regularly. I had my 3/4T shoes relined at a truck shop. They did good work. Just my opinion, but a dual cylinder master is a good idea. I got a mounting kit from a local shop and a drum-drum master for a 72 3/4t from NAPA. All new lines. Works great, and peace of mind.
If you need to do bearing work, you will need the proper socket for the hub. Look at the internal ring nut after you pull the axle shaft so you know how many teeth you need on your socket. If you find one, buy it! It's a good $20-30 investment which will save you time searching when you need it. I believe mine was marked for 67-72 3/4T 4wd, but it fits and works. Your axle should be the same HO52.
It would be nice to find a newer truck that had brake drums similar enough to use, but no luck yet.

Good luck and enjoy your truck.


Current fleet (subject to change w/o notice)
\'49 GMC 3/4-Ton , 60 Austin Healey Frog-eye Sprite (some assembly required), 2011 Dodge Avenger, 2015 Jeep Cherokee. No, they don't all run.
My other ride is a (B737)no, (B767)no, A320.... Update... was Embraer E190, now Boeing B787.

Knowledge is a wonderful thing, but ignorance means you don't know you can't do something.
Joined: Apr 2011
Posts: 174
J
Wrench Fetcher
Wrench Fetcher
J Offline
Joined: Apr 2011
Posts: 174
Thanks Highflyer, and BigTonka thanks for the link to your rebuild, i know ill be running back and forth between computer and truck to see what to do next :P


Moderated by  Phak1, Woogeroo 

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