Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Performance and Technical chat

Reply
 
LinkBack Thread Tools Display Modes
Old 12-08-2014, 01:51 PM   #1
Registered User
 
Join Date: Nov 2014
Location: London
Posts: 10
Break service warning reset.

I can't find anything on this so I apologise if I am duplicating an old thread...

I fitted new front disks/rotors and pads onto my 2002 Boxster S this morning, easy enough. I've driven the car and after a few miles the disks and pads seem to be bedding in nicely and the car is driving well. Unfortunately I now have a warning that comes on every time I start up (I'm at work now but from memory it's something like) "Breaks service now" it clears by pulling the computer stork towards me but a break warning light remains on and the warning is displayed after every start up.

Is there something I can do to clear this without paying a dealer to plug their diagnostic gear in?
Shadow_40 is offline   Reply With Quote
Old 12-08-2014, 01:54 PM   #2
Registered User
 
The Radium King's Avatar
 
Join Date: Apr 2010
Location: Canada
Posts: 2,874
did you replace the brake pad sensors or reuse the old ones?
The Radium King is offline   Reply With Quote
Old 12-08-2014, 02:06 PM   #3
Registered User
 
Join Date: Nov 2014
Location: London
Posts: 10
I fitted new sensors
Shadow_40 is offline   Reply With Quote
Old 12-08-2014, 02:09 PM   #4
still plays with cars...
 
BoxsterSteve's Avatar
 
Join Date: May 2011
Location: Baden, ON, Canada
Posts: 1,069
Garage
As Radium King suggests, if you have re-used your old wear sensors, it's most likely that's where your problem lies.
Replace them, or do as I did. Mine are stripped and spliced together, sealed with shrink tubing and zip tied to the back side of the strut. Presto, no more pad warning light. I'm OK with that because I visually inspect the brakes twice per driving season, so the pad warning sensors are just unnecessary fluff to me.
__________________
Six speed 2000 Boxster S
Arctic Silver on Metropol Blue | Arctic Silver console, spoiler frame & bumperettes | Crios mod | Technobrace | RoboTop module & modified convertible top relay for one-touch roof operation
BoxsterSteve is offline   Reply With Quote
Old 12-08-2014, 02:27 PM   #5
Registered User
 
Join Date: Nov 2014
Location: London
Posts: 10


I changed the disks because they were severely corodedon the back but the pads had loads of material left on them. I assumed the computer detected that I had done something and therefore threw up a code that must be cleared. Are you saying that's not how it works and that the computer is detecting an existing problem with the new wear sensors?
Shadow_40 is offline   Reply With Quote
Old 12-08-2014, 03:05 PM   #6
Registered User
 
BYprodriver's Avatar
 
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,168
Garage
When the pads are worn enough on the side where the sensor wire is inserted, to contact the rotor, it breaks the electric circuit. This lights the brake warning light. If the pad is still too thin to protect the sensor wire it will light up the warning light again.
__________________
2000 S Speed YellowLN 3.6L cylinders & pistons, triple row IMSB upgrade, R&R connecting rods, billet tensioner paddle,oilpump driveshaft.Heads rebuilt by F6I with new valves & springs.Cayman airbox & MAF housing, 996 intake plenum & 75mm T/B. NHP sport converters &Dansk muffler

Last edited by BYprodriver; 12-09-2014 at 01:11 PM.
BYprodriver is offline   Reply With Quote
Old 12-08-2014, 03:32 PM   #7
Registered User
 
Join Date: Nov 2014
Location: London
Posts: 10
Ok let me clarify... My old pads are thick, loads of material left on there and the sensor wire never got anywhere near the disks. I have fitted new sensors into my new pads these have also never come into contact with the disks.
Shadow_40 is offline   Reply With Quote
Old 12-08-2014, 05:15 PM   #8
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,393
The system is very simple - if the circuit is broken (like when the sensor is worn by the rotor), then the brake service light is illuminated. And it will stay illuminated until circuit continuity is restored. No computers, no calculations, just a simple circuit.

And the sensor isn't really a sensor - it is simply molded plastic with a loop of wire in it so when the rotor wears it down, the wire connection is broken. Then the circuit opens and the brake service light comes on. Its about as smart as a rock. Or a twig.

Since you installed new sensors, my guess is that one of the sensors isn't making a solid connection where the sensor wire connects to the vehicle harness. Disconnect and reconnect each brake sensor from the vehicle harness (making sure that you have a nice firm connection and it is fully seated) to see if this solves the problem.

Otherwise, then you may have received a bad sensor that has an open circuit. You can test each sensor (checking for continuity) using a multimeter to see if this is the cause.
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor

Last edited by thstone; 12-08-2014 at 05:23 PM.
thstone is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 03:17 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page