LR3 parking brake motor screeching

[busrider]

The parking brake motor/actuator on my LR3 is making a load screeching sound when the parking brake switch is pulled and the brake applied. After several seconds of screeching I get a Parking Brake warning indicator on the dash. Does the parking brake motor/actuator have a clutch device that might be slipping and hopefully just in need of a simple adjustment or is the prognosis more dire?

Thanks in advance for your feedback...

[Sasquatch]

Out of adjustment.

[Prodigy999]

Agreed. Out of adjustment or if the shoe has been dragging (the rotor will be burned on the hub area) and the material has burned off.

[busrider]

Is the adjustment made at the motor, the rear rotor/drums or both? I had just installed new rear pads and rotors/drums when the problem began. I did manually adjust the rear shoes upon reassemble and I believe that portion of adjustment is correct.

Thanks for your comments thus far...

[joesamm]

Going thru a similar situation with the eBrake.The eBrake assy was replaced 6 mos. ago under warranty for screeching, etc. Replaced rotors and pads at 61K on a 2007 LR3. Adjusted eBrake shoes but didn't bleed system or hook up LR3 to diag any codes. After driving some 300 miles with no issues, eBrake system unexpectedly locked up rear wheels while sitting in lane waiting for the light to change. Had to use the cable-release technique (manual pg 148) to free wheels and drive off. However, eBrake shoes were now dragging and I trashed whole assembly-rotors, eBrakes, etc. getting the truck home. My dealer won't cover the repairs to the eBrakes under the warranty-they are claiming that using after market rotors voids that warranty. My independent shop told me that my mistake was not bringing the truck in after doing the brake job to bleed the system and adjust the eBrake components but, they have seen lots of these eBrake failures and nobody knows why they're failing.
Take your truck to your dealer or independent and have the system checked-you might save yourself about $1100.00 more, for doing your own brake job.

[LR3inRVA]

does following the emergency brake resetting procedure prevent all of this from happening, or is there something LR has to do to the computer to tell the system the rotors have been replaced?

[srownin]

Originally Posted by busrider

Is the adjustment made at the motor, the rear rotor/drums or both? I had just installed new rear pads and rotors/drums when the problem began. I did manually adjust the rear shoes upon reassemble and I believe that portion of adjustment is correct.

Thanks for your comments thus far...

Hey,

Did you ever get a response on how to adjust this? I am looking at the same problem and possibly replacing the epb actuator. Would rather save the $ and adjust if I can...

Thanks,
Scott

[stmcknig]

I believe one wrinkle when replacing the rear park brake shoes is that the EPB needs to be set to mount mode or service mode which will drive the cables to the fully extended position to allow you to mount the shoes and adjust them. Once done the EPB is then put into latch to take up the slack.

When I had to have my EPB replaced at a local indie shop because they couldn't get it to relatch, I was told that the failure to slack off the cables first was a major cause of problems later on with grabbing shoes or EPB that wouldn't release properly.

I believe the often quoted Bodsy Brake Bible should give you more information and I think you can do it without having a Faultmate handy. You'll find many references to the BBB on the Disco3 co uk site.

[bbyer]

The download etc is free - best deal you will get on the Forum tonight anyway. Yes, there is a parking brake procedure; sounds like some are learning about it the expensive way. All is explained in the download.

Link on disco3 to Bodsy’s Brake Bible

DISCO3.CO.UK Photo Gallery - Bodsy's Brake Bible


Download the latest version; v1.6a as of when I typed this and over 3,700 views now.

Bodsy keeps updating it as he tunes the 36 page pdf up.

The best part is probably towards the end, (page 27/36 and onwards), re the electronic parking brake.

It is black art stuff, (well leading edge, maybe bleeding); also the set and unset procedure applies when doing just a normal rear pad change.

If you ignore the set unset procedure, then a few miles down the road, the squealing will start.

The fronts are more normal, but the rears, not!

You actually have three pair of brake assemblies to deal with: (1), the front pair of rotors, and pads, (2), the rear pair of rotors and pads, and then (3), the parking brake pair of drums and shoes – yes, drums and shoes.

That is why you can use the parking brake as a “dynamic” system to safely slow the vehicle from highway speeds. The owner’s handbook explains the procedure as below.

Dynamic operation: In an emergency, the park brake can be applied dynamically’, i.e. with the vehicle travelling at more than 3 km/h (2 mph). Pulling up on the lever and holding it up gives a gradual reduction in speed. The brake warning indicator will illuminate accompanied by a harsh sound and a ’Caution! Parkbrake applied’ appears on the message screen. The stop lamps will illuminate. Releasing or depressing the lever will cancel the parkbrake application.