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Old 01-21-2019, 07:13 AM   #1
JayG
On the slippery slope
 
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Join Date: Mar 2014
Location: Austin and Palm Springs
Posts: 3,793
Garage
Exclamation Weird brake problem

My pedal is soft. It travels more than what I would call normal before you can feel the brakes start to grab

When the car is off (no boost) the pedal is rock hard
I have replaced the master cylinder and the system has been flushed and bled twice, so I an very confident that there is no air in the system. ABS works properly. The ABS pump has been tested with a PWIS and is fine

The brake lines are newer and SS. Pads and rotors are newer

When the car is running and you have brake boost the pedal is soft.

Our theory is there is too much boost.
Could that be the case?
Can a booster fail in such a way that it increases boost?

I need to get the wrapped up fast as I am planning on going to the track this week

I guess I could always disconnect the booster and go with manual brakes

Your suggestions are very welcomed
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2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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