Close
QUESTIONS

RepairPal is your advocate for car care advice and guidance

Q: Soft brake pedal on 1994 Mazda Navajo

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Replaced Master cylinder (2 times), Vaccuum booster, calipers, rotors, pads, wheel cylinders, drums and shoes. Had HCU bled at ford dealership. pressure bled system 2 times, still pedal sinks to floor. If pumped will build pressure. Soft application will sink to floor. HELP
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
Get a Repair Estimate
Guaranteed by certified locations nationwide. Learn more
RepairPal estimates are guaranteed at over 1,700 quality certified locations nationwide. Learn more
Sounds like you surely replaced just about everything.

The only possible causes of issue at this point are:
1) air in the lines
2) faulty master cylinder.

Obviously, the master cylinder being replaced twice makes this part less likely to be bad. However, it is possible.

Try to bleed the system thoroughly again - get some assistance if needed.
Thank you for reply. Could bad HCU be an issue? 4 wheel abs system. The most current feedback I received from Ford is possible valve stuck in HCU. Will try to pressure bleed brakes with new machine, used cheap vaccuum set up last 2 times. Once again, thank you for the reply.....
Very much doubt an HCU. Usually, a failed HCU with a stuck valve will cause a pull, but not a soft pedal.
Didn't find what you were looking for?