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Brake Pad Warning Light
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Robbie
 


Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932

United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4
Brake Pad Warning Light

I've got my brake pad warning light coming on intermittently and not something I have come across before. The warning systems that share the same earth splice and terminal stud are all ok, so the issue is isolated to the brake pad sensor loop.

Any suggested locations to look for damage on the wiring loom?

(ie it is cold out there, the plastic is all stiff and I'm not exactly at full strength at the moment, so pointers appreciated)

Question
 Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

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Post #20250693rd Feb 2019 12:45 pm
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Bardley
 


Member Since: 02 May 2018
Location: Hertfordshire
Posts: 437

United Kingdom 2011 Discovery 4 3.0 TDV6 HSE Auto Santorini BlackDiscovery 4

Are your brake pads known to be okay? Got to be first looksee rather than go wiring fault first off?
 2011 MY D4 HSE
Previously 2001 D2 TD5, 1996 D1 300Tdi, 1985 90 2.2 petrol.
Bikes! KTM, BMW, British, Classics and others.
 
 
Post #20250763rd Feb 2019 1:17 pm
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Robbie
 


Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932

United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

Pads are fine. The warning circuit works by physically severing a sacrificial wire loop when the pad drops below a set thickness. An intermittent warning should not be possible as you have to physically replace the sense wire to make the warning go away.
 Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

Diagnostics for:
Defender, FL2, D3, D4, Evoque, RRS & FFRR
A not-for-profit enterprise


 
 
Post #20251203rd Feb 2019 3:44 pm
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Emmet McKnight
 


Member Since: 19 Jan 2018
Location: Derry
Posts: 265

Ireland 2006 Discovery 3 TDV6 HSE Auto Zermatt SilverDiscovery 3

A new sensor is about £5, in fact I bought the front and rear for £8 as I’m having the same issue, yet to fit them.
  
Post #20251373rd Feb 2019 4:13 pm
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Bardley
 


Member Since: 02 May 2018
Location: Hertfordshire
Posts: 437

United Kingdom 2011 Discovery 4 3.0 TDV6 HSE Auto Santorini BlackDiscovery 4

Yep. Know how it wrks.
Doesn't say that you chked pads in your post and have no idea of your skills.
 2011 MY D4 HSE
Previously 2001 D2 TD5, 1996 D1 300Tdi, 1985 90 2.2 petrol.
Bikes! KTM, BMW, British, Classics and others.
 
 
Post #20252373rd Feb 2019 8:31 pm
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Disco_Mikey
 


Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20713

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

See this with faulty sensors, or when they fall out the pad...
 My D3 Build Thread

TDV8 Retrofit Build Thread 
 
Post #20252433rd Feb 2019 8:51 pm
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Sea Raider
 


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


I had similar on the rear offside when I first bought the motor, turns out the little spring clip that holds the sensor onto the pad had decided to go off on holiday and hte sensor was moving about on the pad.

New sensor sorted it out
  
Post #20252593rd Feb 2019 10:09 pm
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Robbie
 


Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932

United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

Bardley wrote:
Yep. Know how it wrks.
Doesn't say that you chked pads in your post and have no idea of your skills.


Ok.
 Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

Diagnostics for:
Defender, FL2, D3, D4, Evoque, RRS & FFRR
A not-for-profit enterprise


 
 
Post #20253364th Feb 2019 9:24 am
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Robbie
 


Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932

United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

Disco_Mikey wrote:
See this with faulty sensors, or when they fall out the pad...


Sea Raider wrote:
I had similar on the rear offside when I first bought the motor, turns out the little spring clip that holds the sensor onto the pad had decided to go off on holiday and hte sensor was moving about on the pad.

New sensor sorted it out


If only a sensor change was easy(!) but I will buy both and take it from there. Both of them look fine and feel secure so presuming there is an intermittent open somewhere.

Thumbs Up
 Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

Diagnostics for:
Defender, FL2, D3, D4, Evoque, RRS & FFRR
A not-for-profit enterprise


 
 
Post #20253384th Feb 2019 9:33 am
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stew 46
 


Member Since: 01 Dec 2011
Location: cornwall
Posts: 10146

England 2005 Discovery 3 TDV6 SE Manual Siberian SilverDiscovery 3

Bardley wrote:
Yep. Know how it wrks.
Doesn't say that you chked pads in your post and have no idea of your skills.


I expect Robbie has forgot more about electrics than many of us know Bow down Thumbs Up
 -------------------------------------------------
if you cant hold on dont let go , it ill come in handy for something even if you never use it.
D3 SE 05,
110 s wagon 300 tdi SOLD
h top transit
crew cab transit
transit connect
ausa dumper, muck truck .
peljob 2.5 digger
06 L 200 crew cab 
 
Post #20253394th Feb 2019 9:35 am
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Robbie
 


Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932

United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

Don't worry Stew, I seem to get more stupid with every passing day.

Laughing
 Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

Diagnostics for:
Defender, FL2, D3, D4, Evoque, RRS & FFRR
A not-for-profit enterprise


 
 
Post #20253644th Feb 2019 11:31 am
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jamez79
 


Member Since: 03 Sep 2018
Location: Staffordshire
Posts: 565

United Kingdom 2012 Discovery 4 3.0 SDV6 XS Auto Indus SilverDiscovery 4

I broke a sensor when changing the rear pads and discs and epb. I didn't have a spare so left it attached, wire was still intact but plastic had broken when i removed it as was brittle. I got an intermittent warning. changed the sensor and all fixed.
   
Post #20269079th Feb 2019 11:37 am
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Ali1971
 


Member Since: 13 Jun 2016
Location: Dalgety Bay
Posts: 817

Scotland 2012 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

Question ? Does the rear handbrake shoes let you know when they are worn? Just thinking about an ongoing fault currently which pops up from time to time?
  
Post #202719510th Feb 2019 11:47 am
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jamez79
 


Member Since: 03 Sep 2018
Location: Staffordshire
Posts: 565

United Kingdom 2012 Discovery 4 3.0 SDV6 XS Auto Indus SilverDiscovery 4

Rear pads have a warning. I think (so could be wrong) the only warning the rear hand brake pads give are when the epb mechanism starts squealing.
   
Post #202720510th Feb 2019 12:38 pm
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Ali1971
 


Member Since: 13 Jun 2016
Location: Dalgety Bay
Posts: 817

Scotland 2012 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4



Getting this and not going away anytime soon !! Red P flashes. Now wonder if it’s a bad connection somewhere??
  
Post #202721510th Feb 2019 1:11 pm
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