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Thread: EPB - Park brake module fixed IN SITU

  1. #1
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    EPB - Park brake module fixed IN SITU

    My EPB jammed up and made the screeching sound of death. I used the emergency release which got me on my way but the next time I tried the brake it made an even more deathly noise. I found a couple of youtube videos which replicated the exact same air-ratchet kinda noise which carries on for about 5 seconds. Most of these videos suggested the gears in the module have become mush and it must be replaced. I cant afford a whole new module at about $1600 for the part alone so I ordered the gear kit from the UK ($20 delivered) and whilst it was on the way I got looking at how hard it actually is to remove the module and overhaul the internal gearbox. VERY HARD. But during this research I found something interesting. Theres an inbuilt mechanism in that gearbox to protect the gears from tearing themselves apart if something jams. This is what makes the awful noise, meaning that most modules that are replaced because of the noise are actually fine. The other interesting thing is that the cover for the EPB module can be removed in-situ and the mechanism manually unjammed. I've just saved myself about $3000 in parts and labour and it only cost me $20 for a gear kit that I didn't even use.

    If you've got this issue read on and hopefully save some dollars.

    1. Watch this video to get an idea of what needs to be done. He has the module removed, but does what can be done in-situ.
    Land Rover Discovery 3 - Electronic Parking Brake (EP Failure & Repair - YouTube

    2. Jack rear of car up, slide under and find the module above the rear diff. Remove the 8 torx head screws that hold the cover on. Access by basically hugging the drive line and exhaust pipes so you can get both hands up there.

    3. Remove cover using a pry bar or long flathead screw driver. The cover is siliconed on so force is required. I used 2x long screwdrivers on the passenger side lower corner - leverage off the diff and eventually it should break enough silicone to get your hand in and pull it fully away.

    4. Unwind the jammed bar as shown in the video. This takes some effort. The bar needs to be rotated down towards you. I used a stumpy flathead screwdriver and levered off the internal plastic moulding which broke, but theres a solid area behind it which was strong enough to lever off and break the thread.

    5. Wind all the way until the re-latching mechanism clicks back into place.

    6. Test park brake. If its working again remove all the old silicone off the cover and module, re-apply some sealant and reverse the process.

    7. It should be noted that your EPB will likely only jam up like this if it's badly out of adjustment, causing the threaded bar to reach its limit and become stuck. Follow the instructions in Bodsy's Brake Bible linked below to adjust the brake shoes. This involves removing each rear wheel and adjusting the cable length each side. There are some video's on youtube that follow each step.
    https://www.disco3club.co.uk/gallery...ible_V1_6a.pdf

  2. #2
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    Here's a vid that shows all, including the protection mechanism and suss replacement parts, that turn out to be unnecessary:

    Range Rover Sport EPB Actuator Repair. - YouTube

    Maybe it's a follow on from the OP's link

  3. #3
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    Yep thats the exact video I referenced.

  4. #4
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    Prior to seeing that vid I thought the plastic gears etc in the EPB was just a shocker.

    The ratchet mechanism that prevents the gears shredding when the thing is jammed is well explained and changed my opinion about the whole set up.

    DL

  5. #5
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    I was the same. I did find a couple of other videos where there was damage to the gears, namely the very top gear in the arrangement. But the symptoms are different.
    If one hears the rattle gun carry on then the gearbox is most likely okay.

  6. #6
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    Park brake fix

    I have just completed the repairs on my park brake. I bought a 2006 Disko with a blown 4L V6 and had the motor rebuilt then found the park brake was Inoperative, the first thing I did was check the brake linings they were worn, the next was to remove the control module and disassemble it, on inspection of the plastic gears I found the largest gear had three teeth striped. I also found on line in E-Bay Uk a set of new brake cables which included new gears all up with new discks and brake linings the fix cost me $500Au and six hours work.

  7. #7
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    Quote Originally Posted by Rocksaw View Post
    I have just completed the repairs on my park brake. I bought a 2006 Disko with a blown 4L V6 and had the motor rebuilt then found the park brake was Inoperative, the first thing I did was check the brake linings they were worn, the next was to remove the control module and disassemble it, on inspection of the plastic gears I found the largest gear had three teeth striped. I also found on line in E-Bay Uk a set of new brake cables which included new gears all up with new discks and brake linings the fix cost me $500Au and six hours work.
    What were the symptoms of your inoperative EPB? I'm interested to know if it was still able to produce the "rattle gun" sound with the stripped teeth.

  8. #8
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    Quote Originally Posted by TopEndThom View Post
    My EPB jammed up and made the screeching sound of death.....

    5. Wind all the way until the re-latching mechanism clicks back into place.

    6. Test park brake. If its working again remove all the old silicone off the cover and module, re-apply some sealant and reverse the process.

    7. It should be noted that your EPB will likely only jam up like this if it's badly out of adjustment, causing the threaded bar to reach its limit and become stuck. Follow the instructions in Bodsy's Brake Bible linked below to adjust the brake shoes. This involves removing each rear wheel and adjusting the cable length each side. There are some video's on youtube that follow each step.
    https://www.disco3club.co.uk/gallery...ible_V1_6a.pdf
    I'm wondering if there is a clever way to pull the manual release then via the OBD/GAP Tool get the motor to wind the threaded rod until it re-latches as per the OP's step 5?
    2005 D3 TDV6 Present
    1999 D2 TD5 Gone

  9. #9
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    Quote Originally Posted by RANDLOVER View Post
    I'm wondering if there is a clever way to pull the manual release then via the OBD/GAP Tool get the motor to wind the threaded rod until it re-latches as per the OP's step 5?
    mine relatched itself.

    it was jammed on after a trip through a deep boggy mud hole. had to pull the manual release to get moving again. I flushed it out with fresh water as best I could. I cannot remember the exact procedure but there was a message on the dash to hold the EPB lever up for a while or something to that effect and it relatched and started working again. had it adjusted during the next service and it's been fine since.

    I did try bodsy's brake bible but when I got it serviced they said I'd ballsed it up so won't be doing it myself again.

  10. #10
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    Quote Originally Posted by Macadamia View Post
    mine relatched itself.

    it was jammed on after a trip through a deep boggy mud hole. had to pull the manual release to get moving again. I flushed it out with fresh water as best I could. I cannot remember the exact procedure but there was a message on the dash to hold the EPB lever up for a while or something to that effect and it relatched and started working again. had it adjusted during the next service and it's been fine since.

    I did try bodsy's brake bible but when I got it serviced they said I'd ballsed it up so won't be doing it myself again.
    I've had something similar happen, mine's been a bit noisy for a week or so, then the day before it stuck on, so I puled the emergency release cable and thought I'd have no EPB, but out of force of habit I pulled the switch up and it started working again. However yesterday it stuck on again, but it was easier to free this time as I put it in low range and drove it forwards and backwards a bit and it came off, so now I've put a cloth over the switch so I don't inadvertently use it, until I can get it to my mechanic.
    2005 D3 TDV6 Present
    1999 D2 TD5 Gone

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