How to Test Brake Booster? - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

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post #1 of 2 (permalink) Old May 17th, 01, 06:32 PM Thread Starter
Senior Tech
Join Date: Jan 2001
Location: Raleigh, NC
Posts: 1,046

77 Type LT ... In a rare instance of not having the the CD player going, at a stop light today I heard a faint sound, like sucking air. When I took my foot off the brake, the sound went away.. Press the brake, I hear it again. I am assuming there is leak in the booster... the cars does run a bit rough at cold start-up ... however, I see no degraded performance in the brake system... the pedal feels fine...Is there any way to detect a bad booster other than a stiff brake pedal...I am assuming that the car is running lean because of the rough cold idle ... maybe the booster is the cause ... I can't find a leak anywhere else and the carb ( rochester 2bbl ) was rebuilt a couple of months ago... I am asking because places I've check want to sell booster/master cyl together ... any and all suggestions would be welcomed and appreciated ... thanks in advance commendatiopn
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post #2 of 2 (permalink) Old May 19th, 01, 08:34 PM
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Join Date: Sep 2000
Location: Glendale,AZ.U.S.A.
Posts: 984

What you are describing sounds like a bad booster.One way to check it is...start the car,let it run for a few minutes,then shut it off.Let it sit for 5 minutes,then pull the check valve off the booster.You should hear a rush of air.If not, make sure the check valve is good.If it's good,the booster is bad.

68 z28 ,68 rs 327 ,73 454 vette, 2 goofy kids
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