Brake pedal goes to the floor when I start it

Tiny
EMMA ADAMS
  • MEMBER
  • 2004 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 180,000 MILES
I put new brake lines new rotors, calipers, pads, bled the master cylinder. I have ABS brakes. I bought a scanner tool I bled the ABS system. Also, when the engine is off I got full pedal, when the engine is running I push on the pedal it goes to the floor.
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Tuesday, August 25th, 2020 AT 1:32 PM

1 Reply

Tiny
ASEMASTER6371
  • EXPERT
Good evening,

This sounds like you still have air in the system.

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

When you bled the system, did you use a pressure bleeder? With it being a truck, using someone to push the pedal will not force the air out of the system.

I would rent a pressure bleeder and bleed the system.

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

I also noticed you did not replace the master cylinder. That may be the issue.

https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder

Roy
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Tuesday, August 25th, 2020 AT 3:55 PM

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