Brake ware light

[UtahWJR]

Light came on driving home tonight - just after driving over a rough section of road. Got home and shut off car. Waited a few mins and restarted. Ware light went off.

Could the rough road cause a sensor to throw a false reading? Anything i should check?

Bill

MY99 boxster

5 speed

[Loren]

One sensor on each wheel.

Could be a bad sensor but be sure to check the pads - front and rear.

[UtahWJR]

Is there any one of the sensors more prone to fail than the others?

What is the lower ware thickness on the pads?

Thanks.

[Loren]

Not really - front pads do wear faster as they do most of the stopping.

2 mm is the wear limit (beginning pad thickness is about 11 mm).

[bilabonic]

I get an fault on my now and again, once the faullt was 'hard on' for days so put car on axle stands and shorted them all out expecting the light to go out.

It did not ???

Do they have a certain resistance ? I always presumed its was just standard loop wire which is either cut or earthed as pad wears.

??????

[Loren]

I get an fault on my now and again, once the faullt was 'hard on' for days so put car on axle stands and shorted them all out expecting the light to go out.

It did not ???

Do they have a certain resistance ? I always presumed its was just standard loop wire which is either cut or earthed as pad wears.

??????

The brake wear light is turned on when any part of the circuit (all 4 wheels) is open.

Usually it is a broken sensor or bad connector.

[bilabonic]

I totally understand it's just a series circuit BUT i shorted mine at the plugs and it was still on, i know on some BMW's they have a resistor as well, thus if there's a short/damage in cabling it will also show as a fault.

This is senses open circuits and shorted circuits.

Poor Porsche design...lol

Edited April 26, 2011 by bilabonic

[Loren]

Racers short them all the time with no problems. So you still have an "open" whether at a connector or somewhere else in the circuit.