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Old 09-28-2017, 10:35 AM   #1
Mryan
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Join Date: May 2016
Location: Madison WI
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Hissing from brake booster

I have a 71 k15 that while running has a hiss from the brake booster? unless my foot is on the brake pedal. Brake pedal pressure seems fine. Is this something that I should be concerned with or perhaps the start of a problem?
Any advice on what I should check?
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Old 09-28-2017, 10:51 AM   #2
kwmech
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Location: Colfax-California
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Re: Hissing from brake booster

Change the booster, cracked diaphram. Will lean out the engine and eventually fail
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Old 09-28-2017, 05:27 PM   #3
AussieinNC
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Re: Hissing from brake booster

kwmech is spot on...change out the booster before it fails on ya...

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Old 09-29-2017, 10:48 AM   #4
Mryan
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Re: Hissing from brake booster

10-4 Thanks for the help
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