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Suspension & Braking Forum by BimmerWorld
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Old 07-17-2014, 05:07 PM   #1
bayos04
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How thick are factory brake pads?

The warning light came on in my 330. To my eye I have a fair bit left. I did the reset (turn the key on for 30s then off) and the warning light has not come back on (around 100 miles on it since the reset). But I don't know if that is what is supposed to happen, it coming on in the first place was just an electrical bug.

This is the worst pad...
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Last edited by Solidjake; 07-17-2014 at 05:27 PM.
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Old 07-17-2014, 05:13 PM   #2
Dirtybrd
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Seems like a fluke. That pad is about 50% worn. Aftermarket and factory pads will be the same thickness
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Old 07-17-2014, 05:38 PM   #3
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Check the brake fluid.
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Old 07-17-2014, 07:15 PM   #4
eneka
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if the brake pad light triggers, it won't reset until you replace the sensor. The light is a yellow circle with two lines around it.
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Old 07-17-2014, 07:19 PM   #5
Gunsnbacon
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Brake fluid +1 but it might cause your pedal to feel spongy as well.

Check inside pads and your sensor alignment and you might want to replace them if faulty (relatively inexpensive)

Which brake light? Is it orange, red, does it show a rotor and pad?

Red light sometimes for faulty/stuck brake or hand brake on

Orange light for holding down your DSC button also maybe faulty sensors... rare though

The orange circular light for faulty or missing sensors
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Old 07-17-2014, 11:13 PM   #6
bayos04
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This is the warning light that came on...
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No squishy feel, but I will check the fluid in the morning. Thanks all!


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Old 07-17-2014, 11:15 PM   #7
eneka
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That is the brake pad wear light. There is one on the drivers front and one on passenger wheel. Check those.
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Old 07-19-2014, 12:34 AM   #8
bayos04
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Fluid level is fine.

So the question I have is, after I do a re-set would the indicator come back on after a while if there really was a low pad? Or did I just tell the car to ignore the problem completely?

Thanks
James


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Old 07-19-2014, 05:45 AM   #9
jfoj
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Quote:
Originally Posted by bayos04 View Post
Fluid level is fine.

So the question I have is, after I do a re-set would the indicator come back on after a while if there really was a low pad? Or did I just tell the car to ignore the problem completely?

Thanks
James
There is no reset for the brake pad wear indicator by turning the ignition on or doing anything else, not sure where you got this idea.

The brake pad wear sensors is a simple series circuit that has a nub in the brake pad that will wear though and open the series circuit and cause the pad wear light to come on. These sensors are consumable and need to be replaced once they wear through, this is how the light is reset.

You either have a flaky sensor, which is hard to have, the sensor wire has damage or a wire is broken inside the insulation in the sensor or the sensor connector is loose or corroded.

A good inspection of the sensors and wiring is what you need to do next.

If I recall correctly the sensors are pn the LF and RR inner most pad?
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Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

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Old 07-19-2014, 08:41 AM   #10
bayos04
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I read about the reset elsewhere on this site. And it worked, the warning light is not on now, and has not come back on after a week and around 150 miles of driving.

I am upgrading the suspension next weekend and will do a more through inspection then.

Thanks all.


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Old 07-23-2014, 08:54 AM   #11
bayos04
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Now this is really strange. The light came back on in the middle of a 20 mile trip, then turned off by itself halfway through the return trip. Looks like I have an electrical gremlin to chase.


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Old 07-26-2014, 02:25 PM   #12
bayos04
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So I took off the tires and checked the sensors. There is a good 1/4" to 3/8" gap on the rear and 1/2"+ on the front, so it is not the sensors making contact with the disk. There is no apparent damage to the wires or connecting blocks. Fluid is 2/3rds of the way up between min and max. I did a brake test (got up to around 45MPH on a wet road and hammered on them) and it stopped like a champ, ABS worked just as I think it should.

Any idea what else to check???? Should I just replace the sensors even though they look fine?

Thanks
James


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