Brake booster

Asked by Dizy Oct 09, 2019 at 03:23 PM

Question type: Maintenance & Repair

Replaced master cylinder, bench bled,
bled at wheels, bled at cylinder (each
thing multiple times & not in this
order). During process of vehicle
bleeds, the brakes are rock hard,
maybe 1" of movement.
"Everything's back together"
I'm standing on my brakes & a fairly
loud pop happens when they fall to
the floor. I pump them, they react w/
little resistance & air throughout the
push, then slow release no sound

1 Answer


The air sound is the booster leaking so it needs replaced. But it also sounds l;ike you my have a Problem with air trapped in the anti-lock motor assembly or what is called the RABS valve, now a lot of them have a bleeder on then that helps in getting out all the air. Now if yous doesn't have a bleeder then you have to bleed the brakes with the key in the on position, then after all the air is out of the brake system carefully drive it to a dirt road and take up to around 30 MPH and hammer then brakes a few times then after that back up and hammer them again. This should reset the system. Hope it works for you. If it don't then the only other option is taking it to a shop that has a power bleeder.

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