brakes will not pump up?

2005 CHEVROLET IMPALA
150,000 MILES • 4.0L
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BILL PAXSON
  • MEMBER
  • 1 POST
Replaced rotors, master cylinder booster. My question is bench bled master cylinder we get all kinds of fluid out of 2 of the 4 ports other 2 don't seem to have much fluid and brakes wont pump up to capacity. #rd master cylinder and new booster what are we doing wrong? This is a non ABS auto.
Jun 15, 2023 at 12:04 PM
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STRAILER
  • ✓Experienced Mechanic
  • 55,694 POSTS
It sounds like you still have air in the master cylinder. here is a video to help you see what's going on and how to get the air out. You will need four bleed lines which the video only shows two but the process is the same.

https://youtu.be/WDxvEQrMkBg

This guide may help as well:

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

Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
Jun 16, 2023 at 3:27 AM
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