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#1
01-12-2009, 11:56 AM
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Red brake light on, front locks up ?
I have 88 Silverado RWD, red brake light on in dash, in winter front brakes lock up and slide easily. pretty scary! No fluid lose, new front pads, calipers, and slide bolts. The pedal seems a little soft until half way down then they lock up in front as soon as i feel some pressure. have not removed rear drums to inspect yet. Could this be caused by worn out rear linings or possibly a bad brake booster. any help would be appreciated.
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#2
01-12-2009, 02:08 PM
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Re: Red brake light on, front locks up ?
Definitely check the rear brakes for wear and proper adjustment. Also make sure the parking brake is completely disengaged...there is no low fluid level sensor. Finally, if the fluid is old, dark, and green, flush it out with fresh fluid and make sure they are bled of any air...furthest wheel to closest to the master cylinder.
My guess is that the rear brakes were dragging and have become glazed...I like to use a 3M rust and paint stripping wheel attached to an electric drill to remove the glaze from the shoes as well as the drum surface, try to get a nice cross-hatch pattern. Hope this helps!
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Current Garage: 2009 Honda CR-V EX 2006 Mazda 3i 2004 Chevrolet Silverado 2500HD 2003 GMC Envoy XL 2000 Honda ST1100 2000 Pontiac Sunfire Vehicle History: 2003 Pontiac Vibe AWD - 1999 Acura Integra GS - 2004 4.7L Dakota Quad Cab 4x4 - 1996 GMC Jimmy 4wd - 1995 Chevrolet C2500 - 1992 Toyota Camry LE 2.2L - 1992 Chevrolet S10 Ext. Cab 4.3L - 1995 Honda ST1100 - 1980 Yamaha XS400 - 1980 Mercury Bobcat.
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#3
01-12-2009, 07:31 PM
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Re: Red brake light on, front locks up ?
The red brake light in the dash being on, and the parking brake is off, usually means that the proportioning valve has sensed a leak in the front or rear system. When this happens the valve closes off the suspected leaking system (front or rear) and turns on the brake light.
Since you have front brakes, suspect the rears for leaks, or the rears are way out of adjustment, or a faulty proportioning valve. Make sure the parking brake is not on (as said previously). Then pull the wire off the proportioning valve. If the light goes out, then there you have it.
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57 Chevy 210 65 Olds 442 Convertible (Another one sold) 75 GMC Vandura 3/4 Ton 1999 K2500 Old Body Style Suburban (Gone but not forgotten) 05 Dodge Ram 3500/5.9 Cummins 2012 Toyota FJ Cruiser
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#4
01-14-2009, 12:35 AM
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Re: Red brake light on, front locks up ?
I did notice the fluid is dark looking probably never changed, ill try that while checking rear linings and lines for leaks. Didnt think of the proportioning valve, ill try to disconnect that wire and see if light goes out. Also does anyone know how to read ABS codes with MIL after jumping the diagnostic Connector. Thanks for the Help
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