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Old 10-17-2005, 11:24 AM   #1
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Default Unusual Breaking Issue

Here'* whats happening

When breaking - moving slowly like creeping at a stop light
I feel a rumble in the pedal and she don't stop without some
hard pressure on the pedal.

Seems as though it'* the ABS system kicking in but it'*
a dry pavement suituation and very slow speeds usually.

happened about 3 or 4 times over the last couple of months.

Over the weekend it happened at speed.
Just what I need - more grey hair!

So what then? what sensors are triggered for the ABS
that I can service or replace. Anyone else have similar
issues - with some resolve? - wheel bearing? Hall sensor?
I'm at a loss but need to R&R before the snow flies....

Thanks for the consideration!
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Old 10-17-2005, 12:52 PM   #2
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Ive got a few ideas on this one. A- You could have some blockage in one of your lines causing a feedback, but Ive never heard of that happening before, B- one of your caliper pistons could be jammed back and each attempt at it pushing out could be causing the kickback.

Solutions- Check all your lines around the wheels and take off the front two wheels and visually inspect the brake cailber and ABS sensors. If you have the tools, and Im sure someone will chime in on this, take off your caliper and look at the pistions and make sure there isnt any damage, altho unless your car was in an accident before, there really shouldnt be any. So if it was, Id check, otherwise stick to checking the ABS system. Also check your relays to make sure its not tripping or shorting itself out.
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Old 10-17-2005, 05:23 PM   #3
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Can you tell if the noise is from the front or the back? If from the back, perhaps this technical service bulletin would apply...

Rear Brakes - Moaning/Humming Noise

File In Section: 05 - Brakes

Bulletin No.: 00-05-23-001A

Date: September, 2001

TECHNICAL
Subject:
Rear Brake Moan/Hum Noise During Brake Apply
(Replace Rear Disc Brake Pads)

Models:
2000-2001 Buick LeSabre, Park Avenue
1998-2000 Cadillac Seville
2000 Cadillac DeVille
2001 Oldsmobile Aurora
2000-2001 Pontiac Bonneville

Attention:
This repair DOES NOT apply to rear brake grunt/groan, pulsation or squeal.

This bulletin is being revised to add a model and to update the model years. Please discard Corporate Bulletin Number 00-05-23-001 (Section 05 - Brakes).

Condition

Some customers may comment on a moan type noise coming from the rear of the vehicle when applying the brakes. This condition may be more prevalent during city stop-and-go or mountainous driving situations. In rare cases, this moan type noise can also occur during the first or second application of the brakes when the brakes are cold.

As the vehicle slows down from 48 km/h to 0 km/h (30 mph to 0 mph), the rear moan type noise may produce a low resonating "hum".

Cause

This condition may be due to pad vibration being transmitted to the caliper assembly resulting in a low frequency resonance.

Correction

Replace the existing rear disc brake pads with a new rear disc brake pad service kit.

The new rear disc brake pads will reduce the vibration being transmitted to the caliper assembly. Refer to the Disc Brakes sub-section of Brakes in the Service Manual for replacement procedures.
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Old 10-17-2005, 07:48 PM   #4
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If you feel the brake like you were on ice but on pavement...

this happen to me this spring, it was a bad wheel speed sensor, but you will need the bearing itself, it come in one piece. Bearing+wheel speed sensor

Bearing = $$ (i replace 2 of them in 1 year and a half)


If you really hate when the ABS engage, you can unplug temporarly the wheel speed sensor (the plug on the bearing, just one is enought) but you will loose all ABS till you replug it.For the time you are getting your bearing...


Goodluck


Mike
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Old 10-18-2005, 10:35 AM   #5
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Default Thanks A TON

Thanks Guy'*

I really appreciate the effort on all your behalf'*

Of course I'm thinkin the speed sensor (hall effect?)
since it'* the most expensive repair I'd imagine it'*
the issue...

Yes well described as ICE on dry pavement...

I'm heading toward a full break replacement soon anyway

So I can disable the ABS system by pullin' a pigtail off the
bearing assembly? Cool... this disables the TCS as well?

Thanks again for the help!
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Old 10-19-2005, 08:02 PM   #6
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Yes, unplug the wire close to the bearing will disengage ABS, stabilitrak and traction control, wich is recommended if you go on the quarter mile track to get better time....
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