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Author Topic: Brakes Trouble Shooting  (Read 150 times)
Hero Member
Posts: 689

69 RS Z/28 52E

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« on: March 03, 2015, 11:54:03 AM »

I've recently had my brakes requiring stiff pedal pressure from my foot. 69 Camaro with front discs. At first I suspected that my calipers were frozen, but I also have a hissing noise which seems to be at the carb throttle bores. I can hear it when the air cleaner is on, but it is noticeably louder when I remove the air cleaner. It been suggested that my brake booster might be bad? Hoe would one check the booster?

Jimmy V.
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« Reply #1 on: March 03, 2015, 12:30:04 PM »

Jimmy, By your own post title (trouble shooting), I would say you may be close to the culprit being under air cleaner. First: Check all hoses and fittings especially where you hear noise.  One way is to get a long piece (arm length) of hose, fuel line size works well, and put one end to your ear and use your other hand to move around area described till you can pinpoint where noise is coming from or visually inspect by taking off all related components (not booster though) and inspect condition, looking for a split or crack. To check your booster, I would use a vacuum pump, like the ones used to suck down an A/C system and see if the booster holds a vacuum.

Putting you First...Keeps me First. Talent on loan from God. Helping the hobbyist and exposing the fraud
1969 SS/RS 396 coupe Hugger Orange X22 712 bought in 79
1969 SS 350 coupe LeMans Blue 713 bought in 79
1969 307 4spd. coupe Daytona Yellow 711 bought in 85
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« Reply #2 on: March 03, 2015, 09:59:56 PM »


I suspect the booster check valve may be involved. Try this link out for some easy checks:

All kinds of things to consider, but be methodical and you'll find it. Let us know -

Regards -

1968 Z28 BRG/W
1969 Z28 X77 LeMans/W
1969 X66 L78 Cortez/BVT
1969 Z11 L48
Mike S
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« Reply #3 on: March 04, 2015, 02:30:36 PM »

 I had a '69 Grand Prix develop a bad booster check valve that caused a hard brake symptom and a very noticeable 'hisssss' sound coming from the firewall/booster area but mainly when I applied the brakes.


67 LOS SS/RS L35 Hardtop - Original w/UOIT
67 NOR SS/RS L35 Convertible - Restored
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