Break pad sensor failing allowing pads to eat rotors
Has anyone else had this trouble with the sensors not working? How are you to know when the pads need changing other than looking at them yourself?
Does 400$ sound about right for the work to be done at the dealer?
Thanks!
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You should have them check the sensors and calipers to verify there are no defects....those repairs would be covered under warranty. Wear items like brakes, tires etc. are never covered unless there's a serious f'k up that you can convince them is not normal wear.
I have 62k on my E and 34k on my C....the E has about 35% of the brakes left..the C was over 60%.
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Thanks for the feedback!
you should be able to see how much of the pads are left by just looking at it...
well... I thought you don't have to pay since it's under maintenance? or warranty...
I am going to need front pads and rotors soon. My dealer (Chicago area) quoted $560 so $400 is a bargain! Has anyone gotten prices in the Chicago area?




I'd go look at the pads, or just tell them you'll be having them done elsewhere....for less.
If the sensor didn't come on, likely it's not that it failed, just that it's not gotten down that far yet.
Most likely you only need pads if this is the first go around.
My dealer told me I needed new pads front and rear and wanted
660 to replace just the pads, when they already had it on a lift
with the wheels off. Replacing pads with a car already on a lift with the wheels off is a 15 minute job per axle.
The pads cost 80 bucks per axle, so they wanted 500 in labor for a 1/2 hour of actual work not covered under warranty.
I told them I didn't apprecaite they're trying to take advantaghe of me, and I'd be going elsewhere.
I replaced the front pads myself for 70 bucks total including a new sensor.
The sensor did go off a little while after I left the dealer, but still had at least 1K miles left.
I still have not replaced the rear pads (40K) and on return visits to the dealer enquired if they needed replacement and was told they were fine!
Ha!
Chumps!
Put the AMG's later on, for about 725 total.




1. Unscrew the brake fluid resevior lid, leave it loose while doing this so you don't put any pressure to the system.
If the brake resevior is completely full when you start, (shouldn't be unless the dealer topped if off)
use a turkey baster to suck a little out so it doesn't overflow,
brake fluid eats paint ya know.
Jack it up, put a jack stand to be safe as well as the jack.
Remove wheel.
Unbolt caliper, 2 bolts, and put something down there to set the caliper on, anything will do, just so you don't let them hang, and strain the hoses. Inspect the hoses, check for cracks. Likely just fine.
Remove old pads (maybe have to knock a pin out out to get them out), remove one allen screw from rotor, take off old, put on new, put screw back in.
Use a C clamp or a large pair of channel locks to carefully push the piston back in until it's flush, put new pads in caliper, bolt calipers back on (2 bolts) install wheel, repeat.
Put some duct tape on the teeth of the channel locks to avoid scratching the calipers, or if you use a C Clamp, use a small piece of wood, or maybe even one of the old pads.
Check the fluid level between doing each side, and at completion.
If you buy pads from the stealer, get some brake fluid too.
MB uses some **** called DOT 4+. And only they sell it.
Likely OK to use any DOT 4 fluid, BUT don't mix DOT 4 and DOT5 under any circumstances.
You can only use DOT5 if you flush completely, and the dealer will end up mixing them, so better to stay with DOT4 unless you plan to race.
If these simple instruction are too complex for you, if you honestly believe that only a trained monkey can do this, that it's beyond you skills, please kill yourself. You are too stupid to live (TSL), and the world is better off without you.

Total time will about 1 hour to 1.5 hours working slowly, and including time to get your tools out, jack the car, drink a beer, and clean up all you will need is a 17mm socket wrench to remove the wheel and caliper, an allen or torx wrench, forget the size, and a C Clamp or LARGE channel locks.
Last edited by C230 Sport Coup; Jun 11, 2004 at 04:59 PM.
If the pad truly wore out and you were metal to metal and the sensor didn't alert you, I would complain to MBUSA, because that is a defect.
The sensor did go off a little while after I left the dealer, but still had at least 1K miles left.
...
If these simple instruction are too complex for you, if you honestly believe that only a trained monkey can do this, that it's beyond you skills, please kill yourself. You are too stupid to live (TSL), and the world is better off without you.
Now, my questions:
1. How do you tell when to replace pads without the sensor? The rears have no sensor, so how do I know when its time?
2. How long could you drive on our brakes after the sensor goes off? I want to order Porterfields yet don't want to waste the money until I know my brakes need replacing. If you answer question 1, I don't really need an answer to question 2.
Thanks.
Unlike Japanese cars rotors, the rotors on European cars do wear like the pads. It is sure odd enough that the rotors wear faster than than the pads.



, not sure about the sensor, mine come out right on time.
