1991 Oldsmobile Cutlass Air in brakelines, where's it comin

MANGUMMIKE

MEMBER
1991 OLDSMOBILE CUTLASS
6 CYL
FWD
AUTOMATIC
77,000 MILES

Hi, I've been getting air in my brake lines, mostly near my passenger rear caliper, and there does not appear to be any fluid leak. Reservoir level fluctuates with application of brakes but no change in overall level. I've replaced the brake master cylider about a month ago and rotors and pads all-around four months ago. Did not see anything to raise concern then. I do get engine speed fluctuation with the application of the brakes. May be a vacuum leak to the power booster. Any ideas? Could a potential vacuum leak cause air to get into my brake system, or is it likely a bad caliper? Thanks

Friday, February 27th, 2009 AT 4:05 PM

1 Reply

MERLIN2021

MECHANIC
17,250 POSTS

Likely a caliper remove it and pull the dust boot back to inspect it, some assembly fluid is OK, but a heavy amount of wetness isnt! If they check out OK pull the master away from the booster, is it dry in between? Now as for the speed change, the plastic piece the vacuum hose goes to is the check valve, take it of, and try sucking thru both ends, air should only pass one way. Replace it if you can suck air thru both ends.

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Friday, February 27th, 2009 AT 4:10 PM