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About 70 miles later my pedal goes to the floor?

Tiny
DUSTIN6030
  • MEMBER
  • 1991 BUICK PARK AVENUE
  • 3.8L
  • V6
  • FWD
  • AUTOMATIC
  • 250,000 MILES
I have replaced my front brakes pads and rotors due to being worn. About 70 miles later my pedal goes to the floor. Pump the brakes does not build any pressure. There are no leaks the master cylinder is full. I put the car on a hoist and the passanger front wheel is the only one that works. Would this be the master cylinder?
thank you
dustin
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Wednesday, January 28th, 2015 AT 5:18 PM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Sounds like it or air in system I'd go with master first. Here is a guide to help you replace the brake master cylinder

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

Please let us know what happens.
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Thursday, January 29th, 2015 AT 6:14 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Here is a video to help you bench bleed the master which needs to be done before installation.

https://youtu.be/WDxvEQrMkBg?si=Ip7jaBmWqudoSYav

also, this guide may help as well

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

Check out the images (below). Please let us know what happens.
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Tuesday, August 13th, 2024 AT 4:24 PM

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