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02-21-2003, 08:34 PM
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#1 |
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Registered User
Join Date: Nov 2002
Posts: 427
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Brake problem
Sometimes when it gets very cold, the brakes act as if the power brake assist (on a 72) is not working. Sorta like trying to use the brakes with the key off. You have to push real hard.
Planning on getting all the old fluid out of there and replacing it with new. But, is there a possibility that moisture has gotten into the power assist and is freezing up? If so, how do I fix it? Replacement? Again, if so, does the master cylinder have to be replaced also? Thanks |
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02-24-2003, 10:40 AM
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#2 |
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Mike
Join Date: Jan 2003
Location: west chester pa
Posts: 2,473
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The first thing to do is what you said,change the fluid.Check the condition of the rubber vac line.
__________________
70'c/10, 71 suburban4x4 402bb, 72suburban 4/6 drop, 72k/5 4x4 blazer 4" lift 35 tires |
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02-24-2003, 01:02 PM
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#3 |
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Registered User
Join Date: Feb 2003
Location: Bremerton, WA
Posts: 86
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Had the exact same problem on an AMC Matador once. The rubber grommet for the vacuum line on the booster was old and cracked. It only leaked when it was cold (rubber was more brittle).
$.79 and 90 seconds of work fixed it. (that price was 12 years ago) 
__________________
'72 GMC C20, "2500 Super Custom", Custom Camper, New 454 '93 K2500 Suburban, Old 454 (157K) |
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02-24-2003, 04:41 PM
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#4 |
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Registered User
Join Date: Mar 2002
Location: Springfield, VA
Posts: 460
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Check the white check valve that goes into the power brake booster where the grommet is. You should be able to get one or two applications of power brakes after your engine has been turned off. If not the check valve and/or the grommet may both be shot.
__________________
1971 Shortbed 350/350 w/ Posi-traction 3:73's 1996 Chevy Silverado TJ in Springfield, Virginia Likes old Chevy trucks Drinks Miller MGD 
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