Assuming you have a dual-reservoir master cylinder block off the front or back brakes and try to adjust the system if the pedal returns you may have a defective or blocked port in your master cylinder.

Also you can reduce a spongy pedal by removing the check value from the master when using disk brakes and in-line residual check values.

Brake Trouble Shooting Guide

Deep pedal

· Air trapped in fluid
· master cylinder too small
· incorrect pedal ratio (too high)
· Rotors warped
· Calipers not mounted square\
· check value out of adjustment or blocked

Pedal to floor

· Air trapped in fluid
· old or contaminated fluid
· master cylinder failure
· caliper or line leaks
· linkage failure


Good luck...