brake pad warning light.

eddiemc05 · 24th June 2015, 18:02

I was under the impression that if my brake pads were worn so that the sensor had tripped, then the brake warning light would be on constantly as soon as the wire had broken etc... however my light comes on after ive been rolling for a short distance.. kinda like how the car locks itself when u get up to a speed..
The reason why im asking is because recently checking the brake pads i found they were pretty new and all sensors where in place and not already tripped... i even unplugged both front and rear sensors and checked for corrosion at plugs.. all was fine...
Can this light come on for any other reason... oh and my brake fluid res was also fine...
thanks

T-Cut · 24th June 2015, 18:49

Quote:

Originally Posted by eddiemc05

Can this light come on for any other reason...

If the sensor head isn't worn through, then there's an intermittant break in the circuit. The warning is popped on if the circuit is broken. It goes out when the circuit is completed again. Usually by sensor head wear, but not always. The front brake lead occasionally rubs on the driveshaft.

TC

Astraeus · 24th June 2015, 20:19

Quote:

Originally Posted by T-Cut

If the sensor head isn't worn through, then there's an intermittant break in the circuit. The warning is popped on if the circuit is broken. It goes out when the circuit is completed again. Usually by sensor head wear, but not always. The front brake lead occasionally rubs on the driveshaft.

TC

Just fixed a similar thing for a member tonight. Check the wiring from the sensor end very carefully for any break in the coating. The one tonight had a bit worn off exposing the metal in the two wires inside. Circuit complete light on.

Fixed by removing sensor, cutting cable at break, exposing small length of each wire. Tin with solder, then solder together. ( not forgetting to put on heat shrink first. ) cover the two joins with a bit of heat shrink each. Heat. Then pull on bigger bit of heat shrink to cover it all to keep out moisture. Light out!
Would be better to replace at some point but that fix should last a while if not forever.

Chris

eddiemc05 · 24th June 2015, 22:49

Thanks guys.. so the behaviour of the light is indicative of the wire being broken of stripped bare?
I have a new rear sensor lying about somewhere..

Mike Noc · 25th June 2015, 06:40

If you replace one of them cut the plug off the old one and solder the wire ends together and you can use it to plug in and quickly help to narrow down any future faults.

fridge · 21st July 2015, 09:04

I had same problem just popped a new sensor on and then tucked into top of engine space and works fine .

24th June 2015, 18:02	#1
eddiemc05 Gets stuck in Mg zt ctdi Join Date: Jul 2010 Location: newcastle n.i Posts: 537 Thanks: 76 Thanked 23 Times in 22 Posts	brake pad warning light. I was under the impression that if my brake pads were worn so that the sensor had tripped, then the brake warning light would be on constantly as soon as the wire had broken etc... however my light comes on after ive been rolling for a short distance.. kinda like how the car locks itself when u get up to a speed.. The reason why im asking is because recently checking the brake pads i found they were pretty new and all sensors where in place and not already tripped... i even unplugged both front and rear sensors and checked for corrosion at plugs.. all was fine... Can this light come on for any other reason... oh and my brake fluid res was also fine... thanks __________________ Mg zt 2004 cdti

24th June 2015, 22:49	#4
eddiemc05 Gets stuck in Mg zt ctdi Join Date: Jul 2010 Location: newcastle n.i Posts: 537 Thanks: 76 Thanked 23 Times in 22 Posts	Thanks guys.. so the behaviour of the light is indicative of the wire being broken of stripped bare? I have a new rear sensor lying about somewhere.. __________________ Mg zt 2004 cdti

25th June 2015, 06:40	#5
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,571 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	If you replace one of them cut the plug off the old one and solder the wire ends together and you can use it to plug in and quickly help to narrow down any future faults.

21st July 2015, 09:04	#6
fridge Newbie rover 75saloon Join Date: May 2015 Location: mallow Posts: 4 Thanks: 0 Thanked 0 Times in 0 Posts	I had same problem just popped a new sensor on and then tucked into top of engine space and works fine .