Brake pedal goes to floor while running

Tiny
DYESCHICK
  • MEMBER
  • 1997 CHEVROLET 1500
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 185,000 MILES
Replaced master cylinder booster, rear wheel cylinders and calipers bled several times. Good pedal until engine is started. Problem started after hitting a pothole. Wheel bearings seem okay.
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Sunday, February 2nd, 2020 AT 7:07 AM

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Tiny
DUFFDIVER
  • EXPERT
Hi,

The brake pedal will drop when you start the vehicle this normal and the pedal will fade a little when sitting in the service bay it will feel different when driving. If the brake goes to the floor there is a leak or the brake system has air in it. So check for brake fluid leaks and repair if necessary.

Bleed the system starting at the master cylinder very important to bleed all air from the master cylinder. Start bleed manually at the master cylinder waiting 10 seconds between bleed cycles. Do the same for all components that is to be bleed. please do not judge the pedal until it's on the road.. I'm attaching repair guides for you to reference to. Let us know if you need any more information.

https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor..

Thank you,
Joe T.
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Sunday, February 2nd, 2020 AT 4:21 PM

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