The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Rear brakes locking up before front

Ekliptix · 07-23-2022, 06:29 PM

I had my truck in the shop a while back. They found the diaphragm had a leak, so it was replaced. They added a preset proportioning valve.

Since driving the truck, the rear brakes lock up well before the front. I've been told adjusting the rear drums within the drum won't help.

My next step was going to buy a simple valve like this, to turn down the pressure doing to the rear brakes.

Any other ideas??

07-23-2022, 06:29 PM	#1
Ekliptix Registered User Join Date: Aug 2013 Location: Calgary, Alberta Posts: 676	Rear brakes locking up before front - tips? I had my truck in the shop a while back. They found the diaphragm had a leak, so it was replaced. They added a preset proportioning valve. Since driving the truck, the rear brakes lock up well before the front. I've been told adjusting the rear drums within the drum won't help. My next step was going to buy a simple valve like this, to turn down the pressure doing to the rear brakes. Any other ideas?? __________________ 1972 Cheyenne Super SWB PS, PB, Tach, A/C, Tilt. Drivetrain: Built 402BB, TCI Streetfighter 700R4, 2,500 stall, Eaton posi, 3.73. Suspension/Chassis: ECE 4.5/6.5 drop, CPP nitrogen shocks, CPP front and rear sway bar, CPP cross members. Exhaust: 3" exhaust with x-pipe, Spintech 3000 mufflers, Hooker ceramic coated headers. Best 1/4 mile time: TBD.