Warning sensor (pads)

[martin_a]

Just wondering - on the W202 are there pad wear sensors front and rear?

The light came on this morning but I only had the front ones done a few months ago so doubt it is them (that and the light flickered a bit as a the pad wore down). Today, solid orange light straight on.

Is there a chance a sensor has popped or something with the cold or does it mean i need rear pads? The car walked the MOT just two weeks ago and the tester said nothing about worn pads.

Cheers,

m.

 

[Supacool1]

Fronts only duder! Time for a pad change. Not that expensive from eurocar parts for the lot.

 

[martin_a]

Thanks chap,

Seriously though... only had them done a matter of a few months and 2000 miles ago. Can't be out already so suspect a sensor failure somewhere!

Mind, the car was intermittantly telling me I had a light out last week. Its now decided it hasn't so perhaps an electrical gremlin sneakign in with the cold!

m.

 

[Supacool1]

Could be a dodgy sensor or some dirt or something.... They are around 2 pounds from eurocar parts. I had a host of things appear on the dash but my pads were really low! As a measure one pad had total of 2 mm of brake material left. I had the BAS light come on and light the whole thing up like a xmas tree. Could be an electrical gremlin-just monitor the dash for a few days....

 

[martin_a]

Cheers! Wondered if it was a bit of muck or something. I'll see what happens and potentially buy s couple and try to fit.

If it's not raining at the weekend i'll get the wheel off.

m.

 

[martin_a]

Right, nice chap at the garage has confirmed pads are fine but still showing up a change. He says its likely to be a bad earth somewhere but if it is due to cold/damp, once the sensor has been tripped is that it? Does it need replacing as it will always give a 'change' reading?

anyone any ideas?

thanks!

m.

 

[GordonTarling]

The system relies on the sensor wire touching the disc and making an earth to put the light on. You either have a faulty sensor or an earth fault somewhere on the wiring to it.

 

[martin_a]

Cheers Gordon. I'm going to order some more and see if that sorts it. The light flashes on driving down the road so it is most disconcerting!

m.

 

[Ian B Walker]

The wire from the pad sensor can sometimes foul the retaining clip and cause an earth. Look for a bare wire on the sensor.