My booster is now making a hissing noise

2006 GMC ENVOY
202,120 MILES
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LAMARTHOLLMAN
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Just replaced from end pads and rotors both sides. My booster is now making a hissing noise
Apr 22, 2018 at 5:53 AM
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KASEKENNY
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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