Afternoon all I'm in need of some advice on my rear brake issues.
Here is some background info, FFR kit which supplies all the braking components from a 99/04 mustang twin piston front and single piston rear calipers with standard non slotted rotors. I have installed a 7" dual diaphragm booster fitted with a XB master cylinder with an in built prop valve.
Here's the issue the pedal requires a lot of pressure to stop the car and only at the bottom of the pedal does the front end want to lock up. After testing/bedding in the brakes they feel weak and almost non assisted by the booster . I have had the bosster rebuilt and the master cylinder stainless steel sleeved I have replaced the pads for softer ones and tested again now the car dips the front end a little better but still requires a lot of pressure. After the brake checks the front rotors are really hot but the rears feel cool, I have fitted a aftermarket prop valve and wound it all the way on and off but no change I have checked the vacuum on the booster and that's up in the 20s so I am now at a complete loss. Any help or recommendations would be appreciated thank you
Regards Psycho
