I've been playing around with this for months now. I have GM front discs, S-10 rear with the clip in wheel cylinders (not positive of the year or the bore sizes), and the mid-70's Ford master cylinder (manual disc/drum) that was recommended and I thought is common to these cars. Wilwood 2lb residual valve to the front and Wilwood 10lb to the rear with a screw type proportioning valve to the rear (adjusted for full rear brakes). Every single part of the entire braking system is new and I double checked that everything is installed and adjusted correctly. The rear brakes just do not work well. I've tried two different residual valves to the rear and tried removing the proportioning valve.
If I test it in the grass, the fronts lock up and the rears will not unless I really stand on the brake pedal. And there is a delay from the time the fronts work to the time the rears do, which I think is built into the master for safety? On the road, the fronts lock up easily and the rears seem to do nothing. I had a situation last fall where a herd of deer ran out into the road in front of me. I hit the brakes and the fronts locked up and I skidded to the side of the road. Missed one by inches... Afterwards I looked at the marks and there were only two from the fronts.
I realize that locking the brakes is not desirable for most efficient braking, but for testing purposes I should be able to lock them in the grass easily I would think. Especially since the brakes were designed to stop a vehicle twice the weight.
Maybe the master cylinder is just not compatible with the rear? Maybe I need a master like the Corvette style? Any advice would be helpful.
If I test it in the grass, the fronts lock up and the rears will not unless I really stand on the brake pedal. And there is a delay from the time the fronts work to the time the rears do, which I think is built into the master for safety? On the road, the fronts lock up easily and the rears seem to do nothing. I had a situation last fall where a herd of deer ran out into the road in front of me. I hit the brakes and the fronts locked up and I skidded to the side of the road. Missed one by inches... Afterwards I looked at the marks and there were only two from the fronts.
I realize that locking the brakes is not desirable for most efficient braking, but for testing purposes I should be able to lock them in the grass easily I would think. Especially since the brakes were designed to stop a vehicle twice the weight.
Maybe the master cylinder is just not compatible with the rear? Maybe I need a master like the Corvette style? Any advice would be helpful.