OK all you brake experts out there, I have a brake problem that I can’t seem to figure out.
I can’t for the life of me get a solid pedal. If I pump them several times they get marginally better, but still not a good pedal feel. I’ve bleed the brakes about 4-5 times now and there is NO air coming out what so ever. I tapped on all the calipers to help remove residual trapped air. I re-aligned the front solid mount calipers to the rotors and they are now as good as they can be. Even with the 8 to 1 pedal ratio I still feel that the pedal is way too soft. I can’t even hold the car still with the line lock.
Here are the components:
3000lb drag only car, 70 Buick GSX replica, (GM A body).
These are manual brakes with 4 wheel disc.
In the front I have a Wilwood disc brake conversion kit with vented rotors. (This setup is slightly used from a street strip application, hence the vented rotors).
Front - Dynalite Billet 4 piston calipers (Pistons are 1.75” diameter).
Rear – GM Metric calipers (Piston is 2.5” diameter).
Wilwood dual master cylinder with 1” bore.
3/16 brake lines and stainless flex lines.
The system is plumbed with the rear portion of the master going to the front brakes. It goes through a line lock and a proportioning valve. (the proportioning valve is currently wide open).
The front portion of the master feeds the rear calipers.
I have an 8 to 1 pedal ratio.
What else can I try?? Do I have the wrong master bore size?
I posted on several sights so far. There has been suggestions but nothing conclusive.
I have Bowling Green coming up soon and I want to bring this new car!