I had a wheel cylinder that was leaking on My 1979 GMC 7000 grain truck. Replaced both wheel cylinders while everything was torn apart. There are two adjusting bolts on the back side of the backing place that hold the brake shoes close to the brake drum. The purpose is so when you push the brake pedal the brake shoes will contact the brake drum quickly and you will not have to "pump" the brakes in order to make contact. There is one adjusting cam for each brake shoe. My question is this - how tight or close to the brake drums do you want the brake shoes?? What I have done so far is turn the bolt until the cam pushes the brake shoe so the wheel no longer turns then backed the bolt/cam off maybe 1/8 of a turn so the wheel turns freely but you can still hear the brake shoe rubbing on the brake drum. Thanks for your input.
- Thread starter andy r
- Start date
Just turn them to lock wheel tight and back of like you did. It is a guessing game you get used to after adjusting several which I am sure you hope you never have to . I have found over the years that the self adjusting brakes used in more modern vehicles tend to have the brakes drag more than the manual adjusted ones. Fact is , I have left out a few self adjusters on my own vehicles over the years as I hate dragging brakes.
farmall 400
Member
I really think they would be self adjusting if all the pieces are still in place. Loosen off just enough so you dont hear them drag in the drum but still hold when pushing the pedal. on a ton truck you back up and tap your brakes while rolling in revevrse and they will adjust themselves. someone with a service manual could explain it better. be careful first time you load it check your stopping power a couple times before you get in a tight. good luck sz
ADB-Ia
Member
- Location
- New Sharon, IA
Copied from the manual of my old Ford - "Turn the adjusting cam of the forward shoe until the shoe is forced against the drum and causes a drag. Turn the cam in the opposite direction until the wheel can be turned without feeling any drag. Adjust the rear shoe in the same manner."
I haven't been into the back brakes. The front brake linings were really thick - about like new. Old girl only has 8000 miles on her. Maybe I won't be in the back brakes anytime to soon. They look like the same type of system with two wheel cylinders each. Do they have the same bolt/cam device to hold the brake lining up against the drum like the front wheels do??? Crawled under the back and I couldn't find the bolt/cam that tightens up the shoes. Just wondering. Thanks.
No self - adjusting here. Two adjustable cams hold the brake shoes close to the drum. Cams are adjusted from the outside of the backing plate. Pistons in the wheel cylinders just doesn't retract as much. When you push the brake pedal the amount brake fluid it takes to get the shoe to the drum is in specification. If the shoes are to far away from the drum it takes a couple pumps to get good brakes.
The rear brakes probably have the star wheel adjusters that you work on through the slotted hole that is supposed to have a plug in it . One on top and one on bottom or slight possibility , just one on bottom. I still have a couple adjuster tools in my box but a home made one out of an old broken screwdriver handle was far better. I used to service IH school busses at work. Did I say I hated trucks. Thought so.
Similar threads
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.
Copyright © 1997-2024 Yesterday's Tractor Co.
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy