Brake problem let me know your thoughts

[benno505]

It sounds like a vacuum boosted system without any vacuum to power it, just like you suggested.

Post up exactly which Wilwood calipers you have (p/n) and/or their piston area, along with the bore size of the master cylinder you're using. Also, ;et us know what size (diaphragm diameter) and configuration (single, dual, etc) of brake booster are you running? The booster may not matter since it sounds like you probably have single digit vacuum levels anyway, but a quick test of the booster should tell you whether it's contributing much, if anything, to the braking equation. Start the car, warm it up, turn off the ignition and then apply the brakes multiple times to clear the booster. Apply the brakes firmly and start the engine, the pedal should noticeably drop as the vacuum assist kicks in. If it doesn't, then the booster is probably getting in the way more than it's helping.

Tobin
KORE3

thanks and sorry for late reply

front brake are 4 piston 2 piece 12.19" rotors (wilwood forged dynalite) part no. 140-11547-R
Rear brake are 4 piston 2 piece 12.19" rotors (wilwood forged dynalite) with internal park brake.
7/8" bore dual tandem master cylinder
wilwood 4 port prop valve
right stuff detailing brake booster 8" Right Stuff Detailing Brake Boosters RPB8001
started the car with pedal on and it barely moved.



what would be best option to get them working for now and future will be a hydroboost?