Brakes!!!!!! 67 c-10 lwb

[ables477]

Okay, I have a 1967 C-10 LWB with a 283 (pulled from an Impala), 3 spd on floor.

Everything runs great, just no brakes. Makes it difficult to drive. I have replaced the master cylinder 3 times, new stainless steel lines from inline tube, new rubber hoses up front, new wheel cylinders on all four wheels (drum), and a used proprotioning valve.

I get excellent pressure to the front brakes, but nothing to the rear. I would have to guess that the proportioning valve is bad? I think that the second fluid resivor in the master cylinder is a reserve correct, not for the rear brakes.

Can I replace the proportioning valve with an aftermarket proportioning valve? If so which one? I have noticed that most of them say disc-drum and disc-disc. My truck is a drum-drum. I just want to get the thing on the road without going broke. Help!!!!!!

[rage'nrat638]

ok.....when you put the master cyl.on does it try to spit brake fluid at you??????

sounds to me like your rod that goes into the master cyl. is out to far.....thus ....when you release the pedal....it never goes all the way in.....

trust me try it .... been there done that.....

[Bowtie67]

ther are two lines coming out of the master cylinder, one is for the front, one is for the rear and I believe the bowl closet to the cab is for the rear brakes, you should be able to blead it right at the master, then go to the proportioning valve and do the same here where it comes out of valve, then go to rear brakes and bleed both rears, make sure you are checking the master to not let it run out of fluid, if you can get good pressur to the rear wheel cylinders, you should be all set. have some one hold brake and try turning rear wheels, if wheels still turn check adjustment. I haven't seen to many proportioning valves go bad but I suppose they could.

[Gordo]

Someone correct me if I'm wrong but, I believe the drum brake system does not use a proportion valve. The piece you have (or should have) is only a distribution block.