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Bleeding Antilock Brakes


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#1 TahoeMike

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Posted 09 June 2003 - 06:41 AM

I'm planning on flushing and bleeding the brake system on my '00 Silverado. Is this done any different with ABS or is it just like regular brakes? Thanks in advance for the help.
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#2 GnatGoSplat

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Posted 09 June 2003 - 09:54 AM

Bleeding is the same as long as no air gets into the ABS modulator.
If that happens, you will have to have the dealer run a Tech 2 bleed sequence on it.
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#3 Jersey Tahoe LT

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Posted 09 June 2003 - 10:26 AM

Could air in the madulator cause the ABS to engage just before I come to a stop? How much does that Tech 2 Bleeding sequence cost? Thanks in advance.

Later,
Brandon
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#4 Ben

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Posted 09 June 2003 - 12:30 PM

Could air in the madulator cause the ABS to engage just before I come to a stop?  How much does that Tech 2 Bleeding sequence cost?  Thanks in advance.

Later,
Brandon

There is TSB to fix ABS initiation on OBS. Don't think NBS has this problem. Issue is ABS sensor gets rust underneath and gets bad ground. Sensor disappears during low speed braking, so ABS computer thinks tire is skidding...so initiates.

Other is brake fluid on friction materials. Causes grabby behavior...no fix other than to change out the frction materials.

NEVER bleed the calipers via "C" clamp method with out opening the bleeder screws. Pushing the old stuff backwards into the ABS valve area will min require tech tool to open ABS valves to bleed to ruining the ABS valves ($$$$ replacement).

[edit]...forgot to list buddies personal Suburban/GM Truck help/info site. Freebie, so price to pay is pop ups.. #1 Son's Suburban/GM Truck info/help site Then go to the TSB section to look up the ABS TSBs.

Edited by Ben, 09 June 2003 - 12:32 PM.

-Ben pic of my rig
1996 3/4 ton GMC SLT Suburban K3500/7.4L/4:1/16x10/LT265-75R16E +148Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
1998 Mazda B2500 (1/2 ton) pickup, 2nd owner...
Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy [approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle] made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear)...
Sold the boat (looking for another): Trophy with twin 150's...
51 cylinders in household, what's yours?...

#5 Jersey Tahoe LT

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Posted 09 June 2003 - 01:00 PM

Well I looked at the site and found nothing in there TSB area. But I went to all Data and found nothing for the Tahoe but the 1999 Yukon 4x4 has a ABS sensor TSB. Why would Chevy not? It is the same thing. How can I talk to a dealer about this. Or at least find out what the TSB symptoms are?

Later,
Brandon
1999 Tahoe LT
Jersey Tahoe Pics
Jersey Tahoe at Car Domain

Onyx Black

APC Clear Corners
Lund Hood Shield
Vent Visors
Tail Light Covers
American Racing Outlaw II's
285/75-16 BFG All Terrain T/A KO's
Performance Accessories 3" body lift
Posted Image
Soon to Come:
K&N Drop in Air Filter
Dual Flowmaster 50 Series exit out the sides
Fogs in the tow hook location

#6 Jersey Tahoe LT

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Posted 09 June 2003 - 01:17 PM

Here is the GMC TSB #

02-05-25-002 JUN 02
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#7 Ben

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Posted 09 June 2003 - 01:37 PM

Well I looked at the site and found nothing in there TSB area.  But I went to all Data and found nothing for the Tahoe but the 1999 Yukon 4x4 has a ABS sensor TSB.  Why would Chevy not?  It is the same thing.  How can I talk to a dealer about this.  Or at least find  out what the TSB symptoms are?

Later,
Brandon

Original thread on another forum

TSB #02-05-25-006A - (11/26/2002) and there's another that haven't been able to find text: 99046B SERVICE BRAKES, HYDRAULIC:ANTILOCK


Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface) #02-05-25-006A - (11/26/2002)

Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface)
1999-2000 Cadillac Escalade

1995-1999 Chevrolet Silverado (Old Style)

1995-2000 Chevrolet Suburban, Tahoe (Old Style)

1995-2003 Chevrolet Astro Van, Blazer, S10

1995-1999 GMC Sierra (Old Style)

1995-2000 GMC Yukon, Yukon XL (Old Style)

1995-2001 GMC Envoy, Jimmy

1995-2003 GMC Safari Van, Sonoma

1995-2001 Oldsmobile Bravada

This bulletin is being revised to change model information. Please discard Corporate Bulletin Number 02-05-25-006 (Section 05 -- Brakes).

Condition
Some customers may comment on ABS activation at low speeds, usually below 8 km/h (5 mph). Upon investigation, the technician will find no DTCs set.

Cause
The cause of this condition may be an increased air gap between the wheel speed sensor and the hub reluctor ring due to rust and debris built up on the sensor mounting surface.

Correction
Measure AC voltage and clean wheel speed sensor mounting surfaces.

Raise the vehicle on a hoist.
Disconnect both the front wheel speed sensor harness connectors.
Place a DVM across the terminals of each sensor connector.
Rotate the wheel with hand speed and measure the ACmV's. The reading should be at least 350 ACmV's.
If the reading is between 200 and 350 ACmV's, remove the wheel, caliper and rotor in order to gain access to the speed sensor.
Remove the wheel speed sensor and plug the hole to prevent debris from falling into the hub during service.
Clean the speed sensor mounting surface on the hub to remove rust and corrosion.

Important
Make sure that the sensor sits flat on the hub. If the sensor flange is distorted, replace the sensor.


Apply a thin layer of bearing grease to the hub surface prior to sensor installation.
-Ben pic of my rig
1996 3/4 ton GMC SLT Suburban K3500/7.4L/4:1/16x10/LT265-75R16E +148Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
1998 Mazda B2500 (1/2 ton) pickup, 2nd owner...
Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy [approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle] made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear)...
Sold the boat (looking for another): Trophy with twin 150's...
51 cylinders in household, what's yours?...

#8 TahoeMike

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Posted 09 June 2003 - 03:37 PM

Thanks for the help! I surely would have "c-clamped" the calipers back without opening the bleeders as that's how I've done it on older cars. :thumbs:
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#9 Jersey Tahoe LT

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Posted 09 June 2003 - 03:50 PM

I have done the C-Clamp thing. Nothing happened luckilly. Will never do it again. Called the dealer. $150-$160 for TSB Service. Without the replacement of anything. I will be attempting this on my own this weekend. Doesn't seem that hard. I will let you all know how I do.

And thanks for posting that Info.

Later,
Brandon
1999 Tahoe LT
Jersey Tahoe Pics
Jersey Tahoe at Car Domain

Onyx Black

APC Clear Corners
Lund Hood Shield
Vent Visors
Tail Light Covers
American Racing Outlaw II's
285/75-16 BFG All Terrain T/A KO's
Performance Accessories 3" body lift
Posted Image
Soon to Come:
K&N Drop in Air Filter
Dual Flowmaster 50 Series exit out the sides
Fogs in the tow hook location

#10 Ben

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Posted 09 June 2003 - 04:11 PM

Also make sure to replace the bleeder screw caps.

Water gets in there withOUT the caps. Once in there, rust...

When bleeder is opened later, NEVER seals and allows air bubbles in.

Only resonable fix is replace caliper or cylinder. Guess you can remachine the seat surface, but then the bleeder screw will go too far into the casting....

Edited by Ben, 09 June 2003 - 04:12 PM.

-Ben pic of my rig
1996 3/4 ton GMC SLT Suburban K3500/7.4L/4:1/16x10/LT265-75R16E +148Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
1998 Mazda B2500 (1/2 ton) pickup, 2nd owner...
Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy [approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle] made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear)...
Sold the boat (looking for another): Trophy with twin 150's...
51 cylinders in household, what's yours?...