I have Benz I change front pad and back pad and sensores but light comes on visit workshop and does not go away. I try to reset with OBD-II but it comes back again. what should I do please. Gill
Cars & Trucks - Mercedes-Benz - E550
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Answers & Comments
I'm assumuming you mean the brake pad sensor. When the pad gets worn too much and the light comes on it means the sensor was worn out and needs to be replaced. Most likely it will be the one that had the least amount of pad on it.
Its possible its another tire if you only replaced 2 sensors.
The pad wear warning shouldn't have to be reset. It will only illuminate if it actively sees the sensor circuit grounding out. If the all the pads/sensors have been replaced properly, it should automatically disappear.
Maybe it's possible there's another problem. Fluid level is ok? No air in the system? All the sensor wires are routed properly?
Check the front brake rotors. There should be a reluctor that
is part of the rotor that the sensor reads. If the brake rotors have
been replaced
in the past, there is a chance that the wrong ones were installed
without the reluctor.
Also, check the voltage generated by the sensor when the rotor is turned
at low
speeds. The voltage will be AC current, not DC current. At low speeds
you should
get somewhere between 1 and 5 volts.
Other way, You may have a faulty ABS computer. We would obtain a known good
computer and substitute it for the one in the car first to eliminate the
computer
factor. If the computer proves not to be the problem, the connectors
would need
to be checked for corrosion or high resistance. Warped routers would not
cause the
problem you described.