04-18-2015, 03:05 PM
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#1
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Registered User
Join Date: May 2013
Location: North Alabama
Posts: 2,079
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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 ?
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04-18-2015, 03:09 PM
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#2
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Need For Speed
Join Date: Feb 2013
Location: Funville
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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.
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04-18-2015, 03:19 PM
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#3
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Registered User
Join Date: Nov 2009
Location: Winnipeg MB
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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.
Checking for continuity (this one is good):
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'99 black 986
Last edited by Mark_T; 04-18-2015 at 03:38 PM.
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04-18-2015, 03:33 PM
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#4
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Registered User
Join Date: Nov 2009
Location: Winnipeg MB
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You should be able to do all this without any disassembly other than unplugging the sensor connector to do the continuity test.
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'99 black 986
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04-18-2015, 03:35 PM
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#5
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Need For Speed
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Quote:
Originally Posted by Mark_T
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 cut the sensor, but only when the pad is sufficiently thin to allow this to happen.
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.
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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.
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2003 Boxster S
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04-18-2015, 03:37 PM
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#6
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Registered User
Join Date: Nov 2009
Location: Winnipeg MB
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Sorry, but you're wrong.
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'99 black 986
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04-18-2015, 03:38 PM
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#7
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I am my own mechanic....
Join Date: Feb 2013
Location: Salt Lake City, UT
Posts: 3,432
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Quote:
Originally Posted by KRAM36
Thickness of the pads have nothing to do with it. It's the rotors being so worn they cut through the wire.
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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.
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04-18-2015, 03:39 PM
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#8
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I am my own mechanic....
Join Date: Feb 2013
Location: Salt Lake City, UT
Posts: 3,432
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Quote:
Originally Posted by Mark_T
Sorry, but you're wrong.
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This...........
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'04 Boxster S 50 Jahre 550 Spyder Anniversary Special Edition, 851 of 1953, 6-sp, IMS/RMS, GT Metallic silver, cocoa brown leather SOLD to member Broken Linkage.
'08 VW Touareg T-3 wife's car
'13 F150 Super Crew long bed 4x4 w/ Ego Boost
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04-18-2015, 03:42 PM
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#9
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Registered User
Join Date: Nov 2009
Location: Winnipeg MB
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Exactly, and it is a lack of continuity through one or more of these circuits that causes the wear indicator to light up.
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'99 black 986
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04-18-2015, 03:51 PM
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#10
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I am my own mechanic....
Join Date: Feb 2013
Location: Salt Lake City, UT
Posts: 3,432
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Quote:
Originally Posted by Mark_T
Exactly, and it is a lack of continuity through one or more of these circuits that causes the wear indicator to light up.
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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.
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'04 Boxster S 50 Jahre 550 Spyder Anniversary Special Edition, 851 of 1953, 6-sp, IMS/RMS, GT Metallic silver, cocoa brown leather SOLD to member Broken Linkage.
'08 VW Touareg T-3 wife's car
'13 F150 Super Crew long bed 4x4 w/ Ego Boost
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04-18-2015, 04:05 PM
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#11
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Need For Speed
Join Date: Feb 2013
Location: Funville
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Ok, lets see what he finds out. I'm putting my money on the rotors.
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04-18-2015, 04:23 PM
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#12
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Registered Boxster abuser
Join Date: Oct 2011
Location: socal
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Probably just routed one of the wear indicator wires incorrectly and it got nicked.
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04-18-2015, 04:24 PM
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#13
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Registered User
Join Date: Dec 2012
Location: FL
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If you have been doing heavy braking like at the track one may have melted. Probably one of the fronts.
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04-18-2015, 05:40 PM
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#14
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I am my own mechanic....
Join Date: Feb 2013
Location: Salt Lake City, UT
Posts: 3,432
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Quote:
Originally Posted by KRAM36
Ok, lets see what he finds out. I'm putting my money on the rotors.
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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?? 
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'04 Boxster S 50 Jahre 550 Spyder Anniversary Special Edition, 851 of 1953, 6-sp, IMS/RMS, GT Metallic silver, cocoa brown leather SOLD to member Broken Linkage.
'08 VW Touareg T-3 wife's car
'13 F150 Super Crew long bed 4x4 w/ Ego Boost
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04-18-2015, 06:42 PM
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#15
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Need For Speed
Join Date: Feb 2013
Location: Funville
Posts: 2,112
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Quote:
Originally Posted by Timco
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.
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Grinding, pulsating and a lack of stopping power are signs of a bad brake rotor. If your brake pads have worn deep into your rotor, the lip on the outer edge of the rotor can cut into your pad wear sensors, causing a brake pad warning to appear in the instrument cluster - even if your brake pads are new. Rotors should be checked every time you service your brakes.
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2003 Porsche Boxster Roadster S H6 3.2L Braking Rotors - 99635140501KT - Front Brake Rotors - Pair 12.51" (318mm) - ES#2535370
__________________
2003 Boxster S
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04-18-2015, 06:48 PM
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#16
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Registered Boxster abuser
Join Date: Oct 2011
Location: socal
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If it's on the Internet it must be true.... lol
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04-18-2015, 06:51 PM
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#17
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Need For Speed
Join Date: Feb 2013
Location: Funville
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Quote:
Originally Posted by healthservices
If it's on the Internet it must be true.... lol
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It's on a very highly respected website and parts dealer. 
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Last edited by KRAM36; 04-18-2015 at 07:59 PM.
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04-18-2015, 06:59 PM
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#18
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Registered Boxster abuser
Join Date: Oct 2011
Location: socal
Posts: 1,014
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Quote:
Originally Posted by KRAM36
It on a very highly respected website and parts dealer. |
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?
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04-18-2015, 07:06 PM
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#19
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Registered Boxster abuser
Join Date: Oct 2011
Location: socal
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And I'd really be laughing my butt off though if we were wrong and you were right Kram.
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04-18-2015, 07:42 PM
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#20
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Need For Speed
Join Date: Feb 2013
Location: Funville
Posts: 2,112
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Quote:
Originally Posted by healthservices
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?
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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.
Quote:
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Grinding, pulsating and a lack of stopping power are signs of a bad brake rotor. If your brake pads have worn deep into your rotor, the lip on the outer edge of the rotor can cut into your pad wear sensors, causing a brake pad warning to appear in the instrument cluster - even if your brake pads are new. Rotors should be checked every time you service your brakes.
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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.
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