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  #1  
Old 07-18-2006, 05:37 PM
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Question Front brakes question

Good afternoon gentleman.
Its my understanding that when you replace the front brake pads,the brake sensors must be replaced also.Is this wright or wrong?
Just a few days ago my yellow brake light flashes from time to time, fluid level is ok and I know that the bads are to be replaced in a few days.
But are the sensors on the replacement list too?
Regards
Dan
Vancouver Canada
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  #2  
Old 07-18-2006, 05:46 PM
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Yes when doing the front pads you also replace the sensors (they're only a few dollars each) When doing the rotors in front you need to regrease/pack the wheel bearings too....but if all your doing is pads, then its just the pads and sensors.
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  #3  
Old 07-18-2006, 05:57 PM
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You have the wrong forum.

No gentlemen here.

There is nothing in the FSM or in Haynes about replacing the wear sensors. Perhaps they simply are switches that turn on the warning light.
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  #4  
Old 07-18-2006, 06:05 PM
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Quote:
Originally Posted by Jeremy5848
No gentlemen here.

There is nothing in the FSM or in Haynes about replacing the wear sensors. Perhaps they simply are switches that turn on the warning light.

The "sensors" are actually just short wires with a piece on the end of them that sticks into the brake pad, and when the pad is worn enough, it scrapes the sensor thats stuck into the pad, and the metal to metal contact (sensor wire to brake rotor) creates a ground, which causes the yellow light on the dash to illuminate. Once they're flickering the light, they are worn, and must also be replaced. This is what they look like:



So when doing front pads, both the pads AND sensors need to be replaced.
__________________
-diesel is not just a fuel, its a way of life-
'89 420SEL 168k - mine (OC-170,000)
'93 190D 2.2 - 223k - mine (OC-222,700)
'01 E320 Wagon - 149k - mine (OC-154,000)
'05 C240 4matic Wagon - 153k - wifes (OC-154,500)
'01 E320 - 162k - Dad's (OC-163,500)
'07 E350 Wagon - 116k - dad's (OC-121,500)
'02 E320 - 193k - Brother's (OC - 192,000)
'09 E350 4matic Sedan - 84k - Brothers (OC-85,500)
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  #5  
Old 07-18-2006, 11:53 PM
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Thank's for the info guy's...
Off to the Mercedes Benz dealership for new pads and sensors...
Best Regards
Dan
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  #6  
Old 07-20-2006, 05:36 PM
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sensors sometimes included

My pads for 240D came with sensors in the same box. I think it was Autozone.
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  #7  
Old 07-20-2006, 06:04 PM
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If you change the pads before the light illuminates, then there is no damage to the existing sensor and you can reuse them.

If you wait for the light to illuminate, then the sensor begins to wear and you should probably change them.
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  #8  
Old 07-21-2006, 12:47 AM
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I was just looking at a local MB after market store we have here and for the price its well worth replacing them (Sensors) 3.25$ each,after all we dont replace brakes on our car that often...
But i do apreciate the input.
Regards
Dan
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  #9  
Old 07-21-2006, 07:03 AM
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Brian is right, sensors can often be reused if they have not contacted the disc. It is very likely that at least 2 of yours are fine. If you have already bought a set, might as well inspect the ones you remove to see if you can reuse them for the next pad change.

Rick
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