Fox Brake booster keeps failing.
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Shakerhood
Dirt-Old 20+Year Member
I know its grasping at straws, but did you check the vacuum tree to make sure it is free of any cracks?
Would be easier to just get a vacuum gauge and put it on the car and see what it does or build smoke machine and check for leaks.
mikestang63
SN Certified Technician
Only thing I can think of is you may have a bad soft line, seal, wheel cylinder and when it gets hot the line expands to the point your pedal sinks
I thought that too but it must be the booster since the MC can be unbolted and my brake pedal still won't return.
Unless the booster relies on the spring pressure in the master cylinder.
Unless the booster relies on the spring pressure in the master cylinder.
Boosters are typically constructed with a return spring that returns the brake pedal to the original position. Vacuum just reduced the effort that it takes to overcome the spring pressure. So once the vacuum is removed and there is no pressure on the brake pedal rod then the booster diaphragm should return to the orignal position.
Binding in the pedal/ pedal assembly?
With the pedal bound, can you unclip the booster rod from the pedal and see what is free? Pedal or booster?
I'm suspicious that you've gotten multiple boosters in a row with the same issue. Needs to be something that has remained with the car after changing all the parts that you have.
It is the booster itself which is consistently failing. MC can be removed and the pedal can be disconnected
85GTStangGuy
Advanced Member
Might be worth double checking that...
Previously....
That's just strange that you are having multiple boosters fail for the same issue. Have they both been Cardone remans?
Both new Cardones. They have lifetime warranty but its far too late to get a refund. I might try spraying some lubricant into the pedal side of the booster. Any ideas what type I should use? I know some oils are bad for seals.
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