2000 Silverado ABS recalls, help ????

[gremlin96]

Originally Posted by j cAT

if the tires pick up MUD that sticks to the tread this will cause the tires to slip when braking or starting out.

the 2000 silverado sensors are well protected from this type of exposure. on earlier GM trucks/vehicles the sensors were exposed to the elements . this would be true with the 1994 S10 pick up. this was big trouble for GM in those vehicles ..

most cases when the ABS acts up on this 2000 silverado and the many similiar vehicles now out there , its the front wheel hubs rusted out. this is easy to determine . since the sensor IS a magnet when the rust forms the sensor is quickly blinded to the encoder wheel in the hub.

with a constant sensor error the ABS LT will come on..

mine was on a 2004, when it was 3 monts old, it had not been on any mud yet. just a few gravel roads and mainly highway. it did not have over 5k miles on it when it was doing it. just driving it on the heavy sanded roads made the magnetite stick to the hub so the sensor would not pick up the signal. have you ever dropped a tool in sand and when you pick it up there is a fuzz on it thats magnetite. it sticks to any thing that is metal that has a bit of magnetic property. the hubs are grate magnets its very week but makes the stuff stick.

[j cAT]

Originally Posted by gremlin96

mine was on a 2004, when it was 3 monts old, it had not been on any mud yet. just a few gravel roads and mainly highway. it did not have over 5k miles on it when it was doing it. just driving it on the heavy sanded roads made the magnetite stick to the hub so the sensor would not pick up the signal. have you ever dropped a tool in sand and when you pick it up there is a fuzz on it thats magnetite. it sticks to any thing that is metal that has a bit of magnetic property. the hubs are grate magnets its very week but makes the stuff stick.

go to the auto part store and look at a 2004 hub assy. you will see that the sensor pick up is inside the hub bearing. no way exterior debris can get to it. a sealed unit. the other sensor is inside the transmission.

with gravel stuck in the tire tread this can cause slippage.

[ibbillyg]

Originally Posted by GMMerlin

Sorry I havent been cruising the boards here lately, but from the looks of it, you are on the right path.
Here is a copy of a GM bulletin that applies to you concerns of low speed ABS activation.
Someone else mentioned the problem of the ABS pump running all the time...that is a separate issue caused by an internal failure of the ABS module....there are NO RECALLS on these issues at this time.
On the subject of the ABS pump run on, there is a gentleman on these boards..I believe his name is Ken Spragg of circuit solutions that had a fix for this...If someone can get in touch with him and have him contact me, it would be greatly appriciated.



here is the bulletin

Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface) #03-05-25-007 - (09/29/2003)
Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface)
2002-2004 Cadillac Escalade, Escalade EXT

2003-2004 Cadillac Escalade ESV

1999-2004 Chevrolet Silverado

2001-2004 Chevrolet Suburban, Tahoe

2002-2004 Chevrolet Avalanche

2003-2004 Chevrolet Express

1999-2004 GMC Sierra

2001-2004 GMC Yukon, Yukon XL

2003-2004 GMC Savana

2003-2004 HUMMER H2

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 the wheel speed sensor mounting surfaces.

Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in the General Information sub-section of the Service Manual (SI Document ID #899664).
Disconnect both the front wheel speed sensor (WSS) connectors at the frame and harness.
Place a Digital Volt Meter (DVM) across the terminals of each WSS connector.
Rotate the wheel clockwise approximately one revolution per second. The minimum reading should be at least 350 ACmV's. If the reading is less than 350 ACmV's, remove the wheel speed sensor. Refer to the applicable Wheel Speed Sensor Replacement procedure in the ABS sub-section of the Service Manual. Plug the WSS bore in order to prevent debris from falling into the hub during service.
Clean the WSS mounting surface on the hub to remove any rust or corrosion using a wire brush, or equivalent.

Important
Make sure that the sensor sits flat on the hub. Check the sensor flange against a straight edge to ensure flatness. If the sensor flange is distorted, replace the sensor.


Apply a thin layer of bearing grease to the hub surface and sensor O-ring prior to sensor installation. Use ONLY Wheel Bearing Lubricant, P/N 01051344 (Canadian P/N 993037).
Install either the original sensor or a new one in the hub. Ensure that the sensor is seated flush against the hub. Refer to the applicable Wheel Speed Sensor Replacement procedure in the ABS sub-section of the Service Manual.
Place the DVM across the sensor terminals and recheck the voltage while rotating the wheel. The voltage should now read at least 350 ACmV's.

what is the sight for this bulletin

[j cAT]

Originally Posted by ibbillyg

what is the sight for this bulletin

this is the recall that applies to my 2000 silverado. your dealership must work with you to give you the info on you vehicles recall work completed concerning this.

If you have this problem post back first what vehicle you have mileage and whats exactly going on.

a rusted /defective hub bearing will also do this..you do not want the dealership replacing both hubs unless you got alot of cash.

[ibbillyg]

Originally Posted by j cAT

this is the recall that applies to my 2000 silverado. your dealership must work with you to give you the info on you vehicles recall work completed concerning this.

If you have this problem post back first what vehicle you have mileage and whats exactly going on.

a rusted /defective hub bearing will also do this..you do not want the dealership replacing both hubs unless you got alot of cash.

thanks for the quick reply - peace