My booster is now making a hissing noise

2006 GMC ENVOY
202,120 MILES
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LAMARTHOLLMAN
  • MEMBER
  • 1 POST
Just replaced from end pads and rotors both sides. My booster is now making a hissing noise
Apr 22, 2018 at 5:53 AM
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.
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KASEKENNY
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 18,907 POSTS
Yeah, normally the hissing is a leaking diaphragm so you could rebuild it but it is easier and normally just as cheap to replace it.

Below is the process from the manual on how to replace this. Please let us know if you have questions with this.

Thanks
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Apr 9, 2021 at 7:51 PM
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