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How to find and change Brake Pedal Switch
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armalites
 


Member Since: 17 Aug 2013
Location: Herefordshire
Posts: 1918

2005 Discovery 3 TDV6 S Auto Buckingham BlueDiscovery 3

That's correct, if you look bake through the thread you will see the old/new picture that Iggy posted showing both as exactly the same.
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Nanocom One 
 
Post #159511318th Jan 2016 12:09 pm
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pfm
 


Member Since: 18 Jan 2016
Location: all over the place
Posts: 3

United Kingdom 2008 Discovery 3 TDV6 HSE Auto Stornoway GreyDiscovery 3

Embarassed Thanks - cant believe that I did not spot that

Looks like I'm good then. Spent sunday worrying for nothing Thumbs Up
  
Post #159511718th Jan 2016 12:13 pm
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Silly Old Hector
 


Member Since: 16 Sep 2016
Location: Brecon
Posts: 2

Wales 2005 Discovery 3 4.0 V6 Petrol SE Auto Bonatti GreyDiscovery 3

This fix worked brilliantly. Thanks for posting.
  
Post #170677916th Sep 2016 10:06 am
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Iceman08
 


Member Since: 22 Sep 2014
Location: Hereford
Posts: 2284

United Kingdom 2010 Discovery 4 3.0 TDV6 HSE Auto Santorini BlackDiscovery 4

Where is the best place to buy the switch from?

Are there varying levels of quality?!

Great write up Iggy Thumbs Up
   
Post #175020117th Dec 2016 12:20 pm
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sean 471
 


Member Since: 26 Apr 2011
Location: Sheffield
Posts: 2990

United Kingdom 2007 Discovery 3 TDV6 Pursuit LE Auto Java BlackDiscovery 3

Yes that's fine
  
Post #175023317th Dec 2016 2:10 pm
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Sea Raider
 


Member Since: 01 Nov 2016
Location: None
Posts: 4450


Iceman08 wrote:
Where is the best place to buy the switch from?

Are there varying levels of quality?!

Great write up Iggy Thumbs Up


Less than £15 delivered from Rimmer for a genuine one for me last week
  
Post #175023417th Dec 2016 2:11 pm
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Stewykablooey
 


Member Since: 24 Jun 2016
Location: Uk
Posts: 7

United Kingdom 2009 Discovery 3 TDV6 SE Auto Stornoway GreyDiscovery 3

Changed this switch after multiple fault messages and worked a treat no more HDC, suspension Faults etc. Thanks all who have posted on this thread. Thumbs Up
Has anyone encountered engine management fault light due to dodgy brake light bulbs?
  
Post #178363025th Feb 2017 4:28 pm
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Charliecloud
 


Member Since: 31 Jul 2014
Location: Tonbridge
Posts: 980

United Kingdom 2005 Discovery 3 4.4 V8 HSE Auto Bonatti GreyDiscovery 3

Excellent 'How To' - Thanks.

When...... I have to do mine,I now know how easy it is Thumbs Up
  
Post #178368325th Feb 2017 6:22 pm
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Stewykablooey
 


Member Since: 24 Jun 2016
Location: Uk
Posts: 7

United Kingdom 2009 Discovery 3 TDV6 SE Auto Stornoway GreyDiscovery 3

Changed brake light / tail light bulbs and have not had engine warning light since. The brake light circuit seems to trigger other faults so I would recommend replacing these to see if it helps before spending loads on expensive diagnostics.
  
Post #178372525th Feb 2017 7:07 pm
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hugeviking
 


Member Since: 08 Jun 2010
Location: cotswolds
Posts: 1481

United Kingdom 2006 Discovery 3 TDV6 S Manual Cairns BlueDiscovery 3

I had these faults in the past week HDC not available etc, i changed the switch for one i had been carrying in the car for about 2years and the fault went but not straight away, it occurred about another five times before it stopped completely. Could it take a few presses of the brake pedal to calibrate the switch.

Andi.
  
Post #178379525th Feb 2017 9:25 pm
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hugeviking
 


Member Since: 08 Jun 2010
Location: cotswolds
Posts: 1481

United Kingdom 2006 Discovery 3 TDV6 S Manual Cairns BlueDiscovery 3

To add to my above post, the switch has been rolling around in the rear cubbybox for all this time. I can't guarantee that the switch plunger hadn't been moved, maybe this caused it to need to settle down a bit.

Andi.
  
Post #178429826th Feb 2017 9:09 pm
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BrianX
 


Member Since: 11 Dec 2005
Location: Bolton UK - it may be 'grim up north' but at least you get gravy on yer' chips.
Posts: 217

England 2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

To anybody who has done the switch replacement and still has all the issues listed on here, check your rear bulbs. One of the brake bulb filaments fell apart on mine then shorted across the brake filament and rear light filament giving very similar results. Changing the switch and bulb sorted my problem, even though in my case it might not have been the switch at all, but since it is such a cause of bad things I thought it best to replace anyway. I even chucked a new spare switch in the glove box 'just in case'.
 '
'
'05 Disco3 TDV6 - gone
'06 Disco3 TDV6 - gone
'08 Freelander 2 - gone
'98 P38 V8/LPG - gone
'02 L322 V8 - gone
'02 Freelander 1 - gone
'05 Disco 3 TDV6 - SWMBO
'06 L322 V8 - current
 
 
Post #203034220th Feb 2019 9:36 am
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loully
 


Member Since: 06 Oct 2010
Location: hertfordshire
Posts: 13

United Kingdom 2010 Discovery 4 3.0 TDV6 HSE Auto Santorini BlackDiscovery 4

Morning chaps, does anyone know if the switch can be adjusted for the bake lights to come on earlier or later on the brake pedal travel at all? I seem to get brake lights on just resting my foot on the brake pedal. You can also here the gear release selector engaging. Any ideas?
  
Post #203232427th Feb 2019 8:50 am
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BrianX
 


Member Since: 11 Dec 2005
Location: Bolton UK - it may be 'grim up north' but at least you get gravy on yer' chips.
Posts: 217

England 2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

As far as I can tell the switch auto-adjusts when you fit it. As you turn it to lock into position it releases the plunger, after which I'm not sure that further adjustment is possible. I've seen other threads on here suggesting that the whole unit will just become unusable if you faff around with it.

Having said that, I did dismantle the old switch and although it might be a bit of a fiddly job I can't see why it couldn't be 'reset' so to speak. I cleaned the connections up on it and used it for a couple of days while waiting for the replacement to arrive and it worked ok for me, so I guess with a bit of care it doesn't just self destruct upon removal.

The first replacement I got wasn't genuine LR and didn't have the auto-adjust. Neither did it work!! Replaced with a genuine and haven't had any issues since - although it was only about 2 weeks ago.

I know the fitting instructions say differently, but I recon (please don't take this as gospel) that if you depressed the brake pedal just slightly when refitting the switch it would cure your problem, but without further investigation I guess it could just as easily brick the adjustment mechanism.
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'
'05 Disco3 TDV6 - gone
'06 Disco3 TDV6 - gone
'08 Freelander 2 - gone
'98 P38 V8/LPG - gone
'02 L322 V8 - gone
'02 Freelander 1 - gone
'05 Disco 3 TDV6 - SWMBO
'06 L322 V8 - current
 
 
Post #203233227th Feb 2019 9:02 am
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BrianX
 


Member Since: 11 Dec 2005
Location: Bolton UK - it may be 'grim up north' but at least you get gravy on yer' chips.
Posts: 217

England 2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

Another solution just came to mind but would be wise to get advice from others on the forum - stick a small spacer of some type (only a mm or two) onto the brake pedal arm where the switch plunger hits it. That would/could delay activation of the switch by enough for it to ignore your 'light touch'?
 '
'
'05 Disco3 TDV6 - gone
'06 Disco3 TDV6 - gone
'08 Freelander 2 - gone
'98 P38 V8/LPG - gone
'02 L322 V8 - gone
'02 Freelander 1 - gone
'05 Disco 3 TDV6 - SWMBO
'06 L322 V8 - current
 
 
Post #203234127th Feb 2019 9:27 am
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