I just finished putting 13" Cobra brakes on the front of my Thunderbird and 11.65" Lincoln brakes on the rear. I used a 92 5.0 Mustang booster and a 94 Cobra Master Cylinder. I have a gutted prop valve from an 87 5.0 Mustang (bottom rear of the valve split with a t-fitting for the front two brakes, bottom front going to a FMS proportioning valve (by Wilwood - 1/8 27 npt) via 3/16" line and then out to the rear via the stock 1/4" brake line.
So the whole system bled out great, everything seemed all good. But when we got the car going, the pedal pushed extremely hard and wouldn't lock any brakes up (rear prop valve fully open or closed), even on gravel. So you have the push the pedal as hard as you can and the car barely slows...
So the whole system bled out great, everything seemed all good. But when we got the car going, the pedal pushed extremely hard and wouldn't lock any brakes up (rear prop valve fully open or closed), even on gravel. So you have the push the pedal as hard as you can and the car barely slows...