'89 C2500 rear brakes lock up

[ASJT3]

Originally Posted by j cAT

I also agree that the brake valving will not cause your issue .. as was mention though the front brakes may not be doing the proper brake effort , so the rears are doing most of the braking... this may mean the brake hoses are bad to the front calipers, or the many other reasons that the front brake pads are not being applied at the proper force to balance the vehicles front to rear brake effort..........

with bleeding the front brakes , this should show , open the bleed screw place hose on the fitting and have a helper hit the brakes see how the brake fluid flows...

with bleeder screw open use C clamp push back caliper see what the brake fluid looks like dirty/air/discolored >>>>.

always use a clear tubing so you can see what the brake fluid looks like coming out the bleeder screw...

You were right, both front brake hoses were clogged. I replaced brake hoses, solved problem. Thanks!

[corem]

In my experience I would bleed brakes the correct order from right rear to left rear and right front to left front. his allows the proportioning valve to center and allow the correct pressure. The shoes could have been contaminated at one time and clean to look good also. Then there could be an issue with drum surface. It its glazed they will grab. Or the drums are over sized and should have been replaced.

[Schurkey]

Originally Posted by corem

In my experience I would bleed brakes the correct order from right rear to left rear and right front to left front. his allows the proportioning valve to center and allow the correct pressure. The shoes could have been contaminated at one time and clean to look good also. Then there could be an issue with drum surface. It its glazed they will grab. Or the drums are over sized and should have been replaced.

Did you miss this part?

Originally Posted by ASJT3

You were right, both front brake hoses were clogged. I replaced brake hoses, solved problem. Thanks!