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  View original topic: Rear brakes locking up
theregoeslouis Wed Sep 29, 2021 3:50 pm

Well recently I’ve noticed my rear drum brakes locking up before my front disc brakes.
Front brakes are good and same with drum brakes.

Where should I start?

Jeff Geisen Wed Sep 29, 2021 4:09 pm

Remove wheels, then the drums and see if grease is leaking out of the axle seals.

aeromech Wed Sep 29, 2021 4:52 pm

Yes, pull the rear drums and look for leaks

airschooled Wed Sep 29, 2021 7:04 pm

Sorta depends on the year bus…

If you have a late bay with a proportioning valve, I would run the Bentley tests on rear brake pressure. It sounds like they're locking prematurely, so either they're getting too much pressure, or your friends are in really bad shape… Start looking for a good used proportioning valve now, as they're not made new and I don't think the rebuild kits are any good, if they exist.

Robbie

SGKent Wed Sep 29, 2021 9:24 pm

could be

rears are too tight
rears are contaminated
fronts aren't working well
front side of master is needs bleeding or is failing
pistons in front calipers are not sliding smoothly
proportioning valve is going bad

Could be any of the above.



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