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1992 chevy astro brake question

3 messages,  Last post on Sep 15, 2009 at 5:19 PM

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#1 of 3 1992 chevy astro brake question by onlyhuman3 Aug 25, 2009 (1:30 pm)
we have a 1992 chevy astro the abs and brake light stays on and the brake pedal is hard to push would this mean the master cylinder needs replacement, thanks donna Replies to this message: Steve_01 (Aug 25, 2009 5:06 pm)
#2 of 3 Re: 1992 chevy astro brake question [onlyhuman3] by Steve_01 Aug 25, 2009 (5:06 pm)
Replying to: onlyhuman3 (Aug 25, 2009 1:30 pm) The most likely cause for the hard pedal is the vacuum assist unit. That's the unit that the master cylinder is bolted to. It's what gives you POWER brakes. On some models, like mine which happens to be an all wheel drive model, chevy uses a hydraulic assist instead of a vacuum powered style.
#3 of 3 2001 Astro ABS/Brake light stays on by old_gmer Sep 15, 2009 (5:19 pm)
I am stumped. Over a year ago my ABS/brake light started coming on while driving and staying on. It goes off just as soon as the engine is keyed off and restarted, which would indicate an intermittent problem. I figured it was just a front wheel sensor going bad. I knew about all of the issues GM has had with these front sensors so I took both sensors out and cleaned them. No change. I then replaced both sensors with OEM service parts and again no change. I recently changed both front wheel bearings, which you can only get with new sensors as part of the assembly, and again, no change. I have checked the connectors at the ABS module and don't see any corrosion. Anyone have any suggestions on where to look next? This is really frustrating.

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