About 70 miles later my pedal goes to the floor?

1991 BUICK PARK AVENUE

250,000 MILES • 3.8L • V6 • FWD • AUTOMATIC

DUSTIN6030

MEMBER
1 POST
FOLLOW

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

Jan 28, 2015 at 5:18 PM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.

HMAC300

CAR REPAIR CONTRIBUTOR
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.

Jan 29, 2015 at 6:14 AM

STRAILER

CAR REPAIR CONTRIBUTOR
54,193 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.

Image (Click to enlarge)

Aug 13, 2024 at 4:24 PM