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IAmJamesBond
Member Since: 18 Feb 2021
Location: W Sussex /Surrey
Posts: 3
  
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| Discovery 4 Electronic Parking Brake EPB switch not working |
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Oh the infamous Discovery 4 Electronic Parking Brake issue.
Hello All
I own a 2012 Discovery 4 3.0 SDV6 HSE; it was driving fine last night at 20.00 but using it this morning at 10.00, there is now an issue. It was a cold night and today has been cold.
Location: South East England, on a farm, clay soil (lovely muddy winters, joyous dusty summers)
Driving: No off-roading but our access is by farm tracks, mainly road driving.
Warnings: Absolutely no indication that an issue was about to happen. No warning lights have appeared since.
Fuses: Both have been checked and are fine
Issue:
Disengaging the EPB: Car is running/ foot on the brake pedal/ Press EPB switch down– Nothing happens (Sound – none) (red Parking Brake Lamp stays on in the instrument cluster).
Works:
Disengaging the EPB: Car is running/ foot pressed down on accelerator- At a certain point, the EPB disengages, I do not feel brake resistance as the car moves (I cannot hear an EPB actuator noise. I cannot hear any brake rubbing noise) (red Parking Brake Lamp turns off).
Engaging the EPB: When I stop the car, I put the car into ‘P’/ pull up the EPB switch- The EPB engages, I can feel the Parking Brake is engaged (I can hear the EPB actuator move the Parking Brake) (red Parking Brake Lamp turns on).
I understand there can be numerous EPB issues, so I am wondering about a good place to start.
Does anyone have an idea where the problem may be?
As I cannot hear a rubbing/ grinding sound, am I going to do any damage using the car until I have fixed the issue?
Any help/ pointers would be much appreciated.
Thank you All
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 4th Nov 2021 10:21 pm |
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Hades76
Member Since: 09 Feb 2021
Location: Petaling Jaya
Posts: 3
 
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This happened to me a few weeks ago. Went to the mechanic and found out that the parking brake servo within the disc has failed ( my left side ).
Bought a new kit ( new left and right and replaced it ). Now it works fine.
If the main servo in the center fails, you will hear a loud noise.
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| 8th Nov 2021 6:50 am |
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IAmJamesBond
Member Since: 18 Feb 2021
Location: W Sussex /Surrey
Posts: 3
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Hello Hades76
Thank you for your input, I appreciate it!
All points noted.
For now, I have ordered a new EPB switch as that seems like the best (easiest) place to start (I am praying that will resolve the issue).
Update from my last post:
The dashboard now comes up with a parking brake warning message and a flashing red 'P' (EPB symbol) as I am driving (needless to say, I have stopped driving it). Still no unusual sounds.
I will give updates on my findings....
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| 8th Nov 2021 12:25 pm |
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IAmJamesBond
Member Since: 18 Feb 2021
Location: W Sussex /Surrey
Posts: 3
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The Good News!
It was a simple (cheap and fast) replacement of the EPB switch! Phew!
So my information about weather, driving conditions etc. was irrelevant.
What I should have mentioned is that my wife* sometimes drives it and I allow the children* to clamber about (not on public roads of course) so....
Water, coffee, anything that spills is probably more relevant.
*Projection! Being a 'brave' and 'chivalrous' man-child, I have chosen to pass the blame onto my family (a well used and wise strategy)!
When I get a moment, I will detail how I replaced the switch....
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| 10th Nov 2021 11:50 pm |
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nigethecat
Member Since: 11 Sep 2016
Location: Marnoch
Posts: 4252
 
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You need to hope that Mrs Bond doesn’t start reading the forum pages!… otherwise you will be shaken and most definitely stirred  I want to see the sweets before I get into your windowless van... I'm not stupid!
Corris Grey D4 Commercial SE 2016
Zermatt Sliver 2007 D3 SE manual (gone)
Indus Silver D4 HSE 2015 (gone)
Bonatti Grey D3 HSE 2006 (gone)
White D3 S (LHD) 2007 (gone)
Firenze Red D4 HSE 2014 (gone)
Black RRS 3.6TDV8 2008 (gone)
Rusty Green Defender 110 1997 (gone)
Black FL2 HSE 2013 (gone)
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| 11th Nov 2021 8:53 am |
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Glendaruel
Member Since: 17 Sep 2022
Location: Dunoon
Posts: 1
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No parking light , no sound , nothing .So thought it must be the parking brake switch , ordered a new one , before replacing the old one , I took it apart and the rockers that press down on the circuit board seemed to be stuck , loosened them replaced and worked fine . So at least I knew it was the switch , I still replaced it with the new one though . £90 for the new switch and 30min work , wish all disco repairs were like it 😂😂
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| 21st Nov 2024 12:17 pm |
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