Re: [No EFI] ABS Help Needed

["Programmer" <nwester@eidnet.org>]

Guess what brake squeel does ?? Sets up a resonance frequency on
the rotor that the wheel sensor can actually pick up. The ABS computer then
gets false signals and you can get false triggering. You can even get false
triggering on a rough road...and yes--contaminated fluid is a real problem
with ABS...nobody likes to flush anymore <G>.
Lyndon.
-----Original Message-----
From: Mike Turner/ENGR/HQ/KEMET/US <MikeTurner@kemet.com>
To: gmecm@diy-efi.org <gmecm@diy-efi.org>
Date: April 28, 2000 9:01 AM
Subject: [No EFI] ABS Help Needed


>Where might one find any information on troubleshooting, communicating
>with, replacing, etc. an ABS unit for a late 86 (ie 87) Corvette?
>
>Ours has developed a couple symptoms. The first occurs just after mild
>brake application. On release of the pedal, the abs kicks in and the pedal
>starts vibrating for a short period. The other symptom is the ABS light
>coming on sometimes after this event but not always. ABS action during and
>after hard braking looks and feels normal.
>
>I have considered a complete brake line flush including the lines to the
>abs unit. Removal and replacement of the abs unit looks non-trivial to my
>untrained eye. My local vette experts indicate fluid contamination should
>not cause this symptom. A sticking pad or caliper could fool the abs (ok
>the wheel may actually be locked up and abs is just doing its job but seat
>of the pants says no wheels are locked since car is slowly rolling). Ditto
>a flaky wheel sensor.
>
>Additional info:
>Calipers replaced a few months ago. Symptoms did not immediately appear
>after replacement.
>Brake pads are hawk autocrossers which squeal impressively.
>Rotors are stock.
>
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