ABS Sensor Broke Off inside Hub----HELP !!

[MNSubbie]

I am putting in lower ball joints in my 2000 Blazer, and needed to take the hub out to get clearance. Tried to take the ABS Sensor out of the hub and ended up breaking it off. Now, there is a pc stuck down in the hole and I can't figure out how to get it out. I can't be the only one who's experienced this??? Anyone have advice on how to get that old piece out of there??

[Airjer_]

Its much easier to unplug the sensor from the harness up on the frame rail (for future refference). Then remove the two fasteners that hold the brackets. I'm thinking you might be replacing the assembly. You can try heating up a small self tapping screw and melting it into the plastic part that is stuck in there.

[old_master]

On 4WD vehicles, the sensor is part of the hub assembly, it is not serviced separately. Don't waste your time trying to remove the piece. On 2WD vehicles the sensor is bolted to the steering knuckle and can be serviced separately.

[Airjer_]

The ABS sensor is Serviceable on a 2000 blazer 4WD.



The napa part # is 531157 and they run about $75

If I remember right there is a TSB on these style of sensors. The problem is the get corrosion under the mounting hole that causes excessive gap. The solution is to remove the sensor (if possible) clean the mating surface, apply some dielectric grease, and reinstall. It might have been for the full size trucks but they used the same setup as these.

[djd99]

Originally Posted by Airjer_

The ABS sensor is Serviceable on a 2000 blazer 4WD.



The napa part # is 531157 and they run about $75

If I remember right there is a TSB on these style of sensors. The problem is the get corrosion under the mounting hole that causes excessive gap. The solution is to remove the sensor (if possible) clean the mating surface, apply some dielectric grease, and reinstall. It might have been for the full size trucks but they used the same setup as these.

For not too much more you can buy the whole bearing assembly, the only way Id replace just the sensor is if the truck had very low miles.

[old_master]

Originally Posted by Airjer_

The ABS sensor is Serviceable on a 2000 blazer 4WD.



The napa part # is 531157 and they run about $75

If I remember right there is a TSB on these style of sensors. The problem is the get corrosion under the mounting hole that causes excessive gap. The solution is to remove the sensor (if possible) clean the mating surface, apply some dielectric grease, and reinstall. It might have been for the full size trucks but they used the same setup as these.

Thank you! I stand corrected, I too remember the TSB.

[basc]

You are correct on the TSB regarding excess rust buildup under the abs sensor.

Operating conditions seen:

Under 5 mph ABS will engage and a slight throbbing in the brake pedel can be felt (with or without using the brske pedal)

Repair proceedure:

Remove Tork bolt from speed sensor in hub, lightly sand area and apply die electric grease, re-install sensor.

Best way to remove the sensor after removing Tork bolt is to twist the sensor back and forth while pulling.

Removing the damaged sensor:

Needle nose plyers, small flat head scew driver, slowly pick away at the remaining component until cleaned out.

[wafrederick]

You are going to waste your time getting broken part of the sensor out.To save time,buy a new wheelbearing instead.