Brake wear indicator light on but ...
07-06-2010, 05:41 PM
#1
Racer
Thread Starter
Brake wear indicator light on but ...
Greetings fellow Rennlisters;
During my last Auto X, the 'brake wear indicator light' came on indicating worn brake pads. I pulled the pads to change them out but noticed that they were only 50% worn (as compared to the new pads). Why should I be changing pads that early? When your 'brake wear indicator light' comes on, how much remaining pads do you have? I spoke with a Porsche repair facility today, who mentioned that the indicator should come on when the pads are 75% worn. If so, I wonder what is triggering the indicator light?
Any thoughts, or ideas really appreciated...
During my last Auto X, the 'brake wear indicator light' came on indicating worn brake pads. I pulled the pads to change them out but noticed that they were only 50% worn (as compared to the new pads). Why should I be changing pads that early? When your 'brake wear indicator light' comes on, how much remaining pads do you have? I spoke with a Porsche repair facility today, who mentioned that the indicator should come on when the pads are 75% worn. If so, I wonder what is triggering the indicator light?
Any thoughts, or ideas really appreciated...
07-06-2010, 06:17 PM
#2
Rennlist Member
Join Date: Oct 2005
Location: Elburn, IL
Posts: 124
Likes: 0
Received 0 Likes
on
0 Posts
The sensors are simple plastic blocks with a wire inside that wears through when the pads get thin enough for the rotor to wear down the plastic and break the circuit. It seams likely that the circuit has been broken via a broken lead wire or other dodgey connection. The plastic part can also break loose from the pads and encroach on the rotor vs the rotor encroaching on it.
They are not expensive or hard to install. Just swap in a new sensor, being careful not to force the plastic block into the steel pad backing.
They are not expensive or hard to install. Just swap in a new sensor, being careful not to force the plastic block into the steel pad backing.
07-06-2010, 06:45 PM
#3
Racer
Thread Starter
The sensors are simple plastic blocks with a wire inside that wears through when the pads get thin enough for the rotor to wear down the plastic and break the circuit. It seams likely that the circuit has been broken via a broken lead wire or other dodgey connection. The plastic part can also break loose from the pads and encroach on the rotor vs the rotor encroaching on it.
They are not expensive or hard to install. Just swap in a new sensor, being careful not to force the plastic block into the steel pad backing.
They are not expensive or hard to install. Just swap in a new sensor, being careful not to force the plastic block into the steel pad backing.
Thanks for the reply...
07-06-2010, 06:55 PM
#4
Rennlist Member
Join Date: Nov 2008
Location: Mooresville, IN (Life Long Cheesehead)
Posts: 5,815
Likes: 0
Received 54 Likes
on
35 Posts
Doesn't the sensor go on when the circuit is broken? Can you use a pencil shaped circuit tester to see which sensor has failed? Is your warning light on all the time now?
07-06-2010, 07:00 PM
#5
Racer
Thread Starter
"Sneaky Pete" the indicator light only comes on when I use the brake hard. On start up no light, normal driving (stopping and starting) no light, jump on the brakes aggressively and the indicator light is on and stays on until car is turned off.
07-06-2010, 11:32 PM
#6
If you still have the 2 piston rear calipers, brake wear can be quite extreme. My light would come on at about 50% wear, so I eliminated the sensors. You probably should have at least 50% left on your pads prior to tracking your car. I have a set of 4 piston caliper that I will install soon and then I will run a better pad for the track.
07-07-2010, 12:30 AM
#7
Pro
Join Date: Oct 2003
Location: Calgary, Alberta. CANADA
Posts: 608
Likes: 0
Received 0 Likes
on
0 Posts
That is not the standard behaviour of the the brake check at startup.
You may have a different problem with the ABS brain and not in the sensors..
You may have a different problem with the ABS brain and not in the sensors..
Trending Topics
12-10-2015, 02:15 AM
#8
how did you eliminate the sensors
If you still have the 2 piston rear calipers, brake wear can be quite extreme. My light would come on at about 50% wear, so I eliminated the sensors. You probably should have at least 50% left on your pads prior to tracking your car. I have a set of 4 piston caliper that I will install soon and then I will run a better pad for the track.
