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Emergency brake actuator for 2001 GMC Sierra 1500

I'm looking for the e-brake actuators for a 2001 GMC Sierra 1500 4wd. It's the device with the notched gear that lets you adjust up your e-brake Dealer price is $93 a piece. Are there any after markets out there?

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They used those on the full sized trucks and suv's so you might want to try a salvage yard..

Posted on Jan 22, 2009

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Sounds as if the transfer case control module has gone bad and grounded the circuit to the 4 low actuator. The module is located behind the headlight switch in the dash. You could try tapping the actuator on the transfer case lightly with a hammer to see if it releases.

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Dec 13, 2011 | 2005 GMC Sierra 1500 Hybrid

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I have a 2001 GMC Sierra Pickup that has electronic 4WD that will not engage. If you press the buttons to enter from 2HI to 4HI, 4LO, Etc. the choice of the button changes (lights up) but the truck does...


fullyjr.

Engaging from 2WD - 4HI/Lo requires movement of the vehicle. very low speed under 5mph, push button should engage. the vehicle has to be moving.

Feb 04, 2010 | 2001 GMC Sierra Crew Cab

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I am trying to replace the 4wd drive actuator on my 2004 gmc.how do i get the spline on the transfer case to line up with the spline on the actuator?


Rotate the actuator until the spline goes on partially, then rotate to align with mounting bolts. May need to turn wheels while doing the final rotation.

Jan 15, 2010 | 2005 GMC Sierra 2500HD 4WD

1 Answer

Had 2001 GMC Sierra in 4WD Auto and went to put in 4 hi. then Service 4WD light came on and selector wouldn't let me select anything and the truck stayed in 2 hi.


On the full size, the front actuator is electric, not vacuum.

When in 4wd mode, a switch on top of the transfer case conducts 12 volts out to the actuator. Wire #50 (brown) is the 12v feed, and it conducts to the light blue wire (#900) to the actuator.
When shifted out of 4wd, the switch opens up and no voltage goes to the actuator.

Check voltage at the connector for the front actuator (at the front differential - it looks like a large bullet that threads into the front diff.) If it has 12 volts, the actuator is the problem. If it does not have 12 volts, check the transfer case switch and the power feed to the transfer case.

I'll assume it is the actuator, if the plug to the actuator is getting 12 volts when in 4wd.
The way this actuator works, is it is a sealed chamber that gets heated by voltage. When it heats, the pin in the end swells and pushes a shift fork in the front differential. The shift fork engages a spline on the passenger side of the differential, and boom! you have 4WD.

GM offered an upgrade to this actuator that is a motor instead of a heated device. However, it requires a small harness addition, a spacer, and a new actuator. It is about a $150 to $200 option.

Good luck. The actuator is usually the problem 90% of time but recheck all of the wire harness just to maker sure there is no short before replacing any parts.

Jan 07, 2010 | 2001 GMC Sierra Crew Cab

1 Answer

4wd will not engage on my 1996 GMC Sierra 1500 pickup


Ok the drive shaft will spin thats good. remove the front driff actuator and see if the plunger extents. if it doesn't check that the power and grond ar ok. If they are then replace the actuator. Just so you know the two actuator may be diffrent. If it has been replaced no problem. If it hasn't ever been replaced then ther is a updated part it come as a kit witha harness spacer and actuator.

Dec 14, 2009 | 1996 GMC Sierra

1 Answer

Wont shift from 2WD to 4WD. 4WD indicator switch blinks (light) but 2WD switch light never goes out.


check switch , fuse and relay if good check cable hoses and wiring at transfer are not damaged or disconnected -check actuator for proper movement actuator has a tendency to stick lube actuator rod if necessary

Oct 30, 2009 | 2005 GMC Sierra 2500HD 4WD

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I have a 2001 GMC 1500 HD. The pushbutton four


see if the front driveline engages, then move to the front wheels if they do not engage check the actuator on the front diff

Aug 21, 2009 | 2001 GMC Sierra 1500HD

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