After replacing brake booster brake pedal goes to the floor

Tiny
MS. LISA
  • MEMBER
  • 2002 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 167,000 MILES
Vehicle has no brakes after changing the brake booster, adding new lines, recap brake fluid, bled, and fairly new master cylinder. The brakes goes right to the floor and you hear air. Can someone help me?
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Sunday, July 28th, 2019 AT 5:06 AM

3 Replies

Tiny
SCGRANTURISMO
  • EXPERT
Hello,

This could be a problem with the vacuum hose going to your brake booster or the brake booster check valve. In the diagrams down below I have included a factory diagnostic troubleshooting flowchart for your vehicle's brake assist system as well as instructions for the removal and installation of the vacuum brake boost check valve and hose. Please go through these guides and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Sunday, July 28th, 2019 AT 8:41 AM
Tiny
MS. LISA
  • MEMBER
I will check. Thank you
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Sunday, July 28th, 2019 AT 8:47 AM
Tiny
KEN
  • ADMIN
If I can jump in here. does this car have ABS? if so you may need to have the ABS valve opened using a scan tool while bleeding to get the air out. This guide can help as well:

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

Please run down this guide and report back.

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Tuesday, July 30th, 2019 AT 1:09 PM

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