Can I diagnose ABS? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-10-2004, 12:08 AM   #1
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Default Can I diagnose ABS?

Is ther some way to do it?

I've been through my brake system a million times, nothing is wrong with it that I can see...
I've checked things a million times, The only thing I can think is maybe the ABS is releasing pressure or something... Is the some way for me to test it?
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Old 06-10-2004, 12:19 PM   #2
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Default Re: Can I diagnose ABS?

Quote:
Originally Posted by Damemorder
Is ther some way to do it?

I've been through my brake system a million times, nothing is wrong with it that I can see...
I've checked things a million times, The only thing I can think is maybe the ABS is releasing pressure or something... Is the some way for me to test it?
Wish I knew...but I would still bet on it being a rear wheel cylinder even if there are no signs of leaks.

Good Luck!

Cheers,
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Old 06-10-2004, 01:38 PM   #3
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Default Re: Can I diagnose ABS?

Quote:
Originally Posted by Damemorder
Is ther some way to do it?

I've been through my brake system a million times, nothing is wrong with it that I can see...
I've checked things a million times, The only thing I can think is maybe the ABS is releasing pressure or something... Is the some way for me to test it?
What are the symptoms??
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Old 06-10-2004, 01:41 PM   #4
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Feels like I don't have enough brakes. The pedal feels too soft till about two inches down, then it feels right.
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Old 06-10-2004, 01:53 PM   #5
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Basic stuff....

How old'* the master cylinder? If it'* old, consider replacing. If it'* new, when you installed it did you bleed the cylinder itself on the bench before installing? I had a very similar issue with my T/A after I replaced the MC. Unbolted it and bench bleed it, bolted it back up and bleed each caliper, not it works great. You have an air pocket trapped somewhere and sounds like it'* right in the master cylinder.
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Old 06-10-2004, 02:03 PM   #6
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Yep it'* a new MC, and it was bench bled,

New Pads, rotors and calipers rebuilt

New shoes

Had it bled by a shop to make sure I'm not a retard, they said it didn't even need bled.
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Old 06-10-2004, 02:14 PM   #7
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Quote:
Originally Posted by Damemorder
they said it didn't even need bled.

Que??
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Old 06-10-2004, 02:16 PM   #8
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Are you making up words?
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Old 06-10-2004, 02:38 PM   #9
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How are bleeding down each caliper and wheel cylinder?

Best process I've found is to have someone in the car pressing and holding the brakes as I unscrew the bleeder. Use a piece of hose off the bleeder into a jar of clean brake fluid. And during the whole process NEVER let the master cylinder get low on fluid.
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Old 06-10-2004, 05:31 PM   #10
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I bled them four times my self, with my brother hitting the pedal, at the wheels.
The shop hooked up some sort of vacuum thingy
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