Re: [No EFI] ABS Help Needed

["nacelp" <nacelp@bright.net>]

> Guess what brake squeel does ?? Sets up a resonance frequency on
> the rotor that the wheel sensor can actually pick up.

Does this mean the speed sensors are reluctor types?.
Whoda thought.

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>.

Seems like, why flush, sell more $$ work later.   Seems like the world is
getting less and less mechanic friendly
Grumpy


> 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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