CX-9 Brake Booster Replacement Issues

zizaspeed

Member
:
2008 CX-9 AWD
2008 Mazdaspeed3
Hi everyone,

Really hoping to get some help on this issue I'm having. Long story short, 2008 CX-9 with 220k miles, a faulty brake booster was identified so I replaced the booster with the Cardone - reman unit.

After installing it, putting everything back together and bleeding the brakes, the brake pedal is nice and firm while the car is off but when the car is running, the pedal goes to the floor.

I'm wondering if maybe there is a vacuum leak, perhaps the check valve is bad but am unsure at this point what could cause this to happen. Any ideas? Thanks!
 

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