Got a break wear light
 

But the pads are new 4 months ago, any way to tell which wheel it is short of taking each off and swapping out the sensor ?

The wire gets cut by the rotor, has nothing to do with how new your pads are. Sounds like you need new rotors. You can buy rotors with new wires as a package deal.

Um I don't think you're correct there. The nub of the sensor gets worn through when the pads wear down enough to expose it. I mean, yes, the rotor does wear through the sensor, but only when the pad is sufficiently thin to allow this to happen. The sensor is there to monitor brake pad wear, not rotor wear. Your rotors could be paper thin and that alone will not cause the indicator light to go on.

In this case it sounds like it might be just a bad connection. Check the connectors to the sensors to see if one has worked loose or fallen off. Could also be a defective sensor, which you can determine by checking for continuity through the sensor with your multimeter. Also check and see if the section of wire between the sensors has been pinched or broken.

http://members.shaw.ca/mtharris/sensor1.jpg

Checking for continuity (this one is good):

http://members.shaw.ca/mtharris/sensor2.jpg

You should be able to do all this without any disassembly other than unplugging the sensor connector to do the continuity test.

Thickness of the pads have nothing to do with it in this case. It's the rotors being so worn they cut through the wire.

Sorry, but you're wrong.

The sensor tip is inserted into the pad. When the pad wears enough the wire makes contact with the rotor once it's exposed through the worn pad. This is the only way they trip unless one is unplugged or damaged.

This...........

Exactly, and it is a lack of continuity through one or more of these circuits that causes the wear indicator to light up.

Or if the wire shorts to ground the second the jacket wears off. I had a pad light and it came on when the pads were wet and it shorted to ground through the rotor.

Ok, lets see what he finds out. I'm putting my money on the rotors.

Probably just routed one of the wear indicator wires incorrectly and it got nicked.

If you have been doing heavy braking like at the track one may have melted. Probably one of the fronts.

It's just not possible, bro. The wire is even clipped into the pad retaining bracket so it cannot possibly touch the rotor. Only a micrometer can check the rotor thickness.

Please. I'm begging you. Think about it.

If not, make it $100??;)

Well then these guys are giving out bad information.

2003 Porsche Boxster Roadster S H6 3.2L Braking Rotors - 99635140501KT - Front Brake Rotors - Pair 12.51" (318mm) - ES#2535370

If it's on the Internet it must be true.... lol

It's on a very highly respected website and parts dealer. :rolleyes:

LMAO

Not to attack you but...

logically, look at where the sensors are mounted, they are on the brake pads and the wear portion of the pads no less. How is it possible that it can measure the thickness of the rotor?

And I'd really be laughing my butt off though if we were wrong and you were right Kram.

Reread what I posted. It has nothing to do with reading the the thickness of the rotor, it has to do with the rotor being so worn out the edge of the rotor cuts the wire.

2003 Porsche Boxster Roadster S H6 3.2L Braking Rotors - 99635140501KT - Front Brake Rotors - Pair 12.51" (318mm) - ES#2535370

If I'm wrong, then I'm wrong, but this is what I have read from a very well respected Porsche parts seller. I didn't just pull it out of the air.