“A Fila In Section: 05 - Brakes
. . Bulletin Ne. O2-05-25-006
Service Bulletin Date: September, 2002

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Subject: Antilock Brake (ABS) Activation At Low Speeds
(Clean Wheel Speed Sensor Mounting Surface)

Models: 1999-2000 Cadillac Escalade -

1995-1999 Chevrolet Silverado (Old Style)
1995-2001 Chevrolet Suburban, Tahoe ~
1995-2003 Chevrolet Astro Van, Blazer, 310
1995-1989 GMC Slerra {id Style)
1995-2001 GMC Envoy, Jimmy, Yukon, Yukon XL“
1995-2003 GMC Safarl Van, Sonoma

© 1995-2001 Oldsmobile Bravada —
with 4WD or AWD

Conditlan 4. Rotate the wheel with hand speed and measure
Some customers may comment on ABS activation at tha ACmV's. The reading snoukd be at least
low speeds, usually below 8 kivh (5 mph). Upon 350 ACM's.
investigation, the technician will find no OTCs set. 5. If the reading is between 200 and 350 ACm\s,
Cause remove the wheel, caliper and rotor In order to
The cause of this condition may be an increased air gain accass fo the speed sensor.
gap between the wheel spead sensor and the hub 6 Remove the wheel speed sensor end piug the
reluetor ring due to rust and debris built up on the sansor hole to prevent debris from falling into the hub
mounting surlace. during service.
Correction 7. Clean the spead esnsar mounting surface on the
Measure AG voltage and clean wheel speed sensor hub to remove rust and corrosion.
mounting surfaces. Important: Make sure that the sensor sits fiat on tha
1. Raise the vahicie an a holst. hub. If the sensor flange le distorted, replace the
2. Disconnect both the front wheel speed sensor Sensor.
hamess connectors. 8. Apply a thin layer of bearing grease to the hub
3. Place a DVM across the terminals of each sensor aunece prior ta sensor insteliation.
connector,

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Page 2 September, 2002 Bulletin No.: 02-05-25-006
9. Install either the original sensor or a new one in Warranty Information
the hub and secure tha sengor. Enaura that the For vohiclos repairad under warranty, use:
sensor |e seated flush agalnai the hub. Pa a ©@
10. Ingtall the rotor, the caliper and the wheel. Labor
11. Placa the DVM across the sensor tarminals and Operation Description Labor Time
recheck the voltage while rotating the wheel by Use
hand. The vollage should now read at least Hedi2 Sencar, Wheel Spaed published
350 ACmVv's. (Front Beth) - Replace labor
operation time
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