Question about 1993 Chevrolet Astro

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ABS and brake light are on in dash, how to diag problem?

ABS and brake light just popped on and now pulls hard to left when braking.

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  • fushion3 Dec 04, 2008

    I found the info I was looking for regarding the ABS. I ran the diag by connecting pins "A" & "H" and reading the flashes of the ABS light. I got codes 61 & 62 which revile a pressure difference between the front calipers and shut down the system. This makes sense because of the pulling issue, I will bleed the system tomorrow and hopefully will find the left caliper has air...problem solved.

  • fushion3 Dec 05, 2008

    rpm,

    Don't take this the wrong way, I'm sure your a knowledgeable person, but the info I gathered on the system and understanding the hydraulic flow lead me to fixing the problem. I didn't say ABS "put" different pressure on different wheels as you suggest, but pressure sensors within the system can detect different pressures and if they are out of given parameters this can turn the ABS light "on" as a soft fault. I did have an air bubble in the left side that came out while bleeding the ABS module. I reset the ABS system to turn out both the brake light and ABS light and test drove and like I said, problem solved. There was absolutely nothing wrong with the caliper or hose, the air in the system wouldn't allow for even application of the front brakes, it was simple hydraulics.


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Good luck with that, but ABS system isn't going to put different pressure to different wheels, it's constant pressure. Bleeding the system isn't going to help, you have a bad caliper. Make sure you change the brake hose when you change the caliper.

Posted on Dec 04, 2008

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Sound like you have a bad brake caliper if you keep driving it it will lock up and you will be stuck it will start smoking soon

Posted on Dec 04, 2008

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