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#1
07-18-2006, 05:37 PM
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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
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.
__________________
-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#3
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.
__________________
 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#4
07-18-2006, 06:05 PM
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Quote:
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- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#5
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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#7
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
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
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
__________________
80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)
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