1972 Oldsmobile Cutlass Supreme Break Booster Problem? Unidentified sound?

5

Asked by Jan 06, 2014 at 02:03 PM about the 1972 Oldsmobile Cutlass Supreme

Question type: Maintenance & Repair

I was given a 1972 Oldsmobile Cutlass Supreme from a relative a few months ago and
up until a maybe a week ago i noticed a hissing sound coming from what it seems like
behind the dash on the left side of the steering wheel. Seems like its coming from the
break booster. Its not a hissing sound when i apply the breaks but a hissing sound
right from ignition and as i accelerate it also gets a bit louder. Anyone know what it
might be? The car is in great condition by the way, need to change the oil pan due to a
leak but in the meanwhile i'm keeping an eye on the level every few days. Thank You
guys.

2 Answers

86,615

From the description it sounds like the vacuum booster itself, the only real way to find it is to get a mechanics stethoscope and take out the metal probe unit and just use the hose and run along under the dash where the brake pedal rod goes through the firewall, if you hear a hiss right where the rod goes through then the booster is leaking, also check the booster check valve and main vacuum hose to the booster for any leaks.

Best Answer
3,695

And the good new is that if its the brake booster they are really easy to rebuild yourself. Buy a rebuild kit at the auto parts store and invest a sat afternoon and you're good to go. Having said that they rarely go so be sure to check all other vacuum lines in the area first like tennisshoes said.

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