Yesterday while driving in rain...I noticed the brake pad wear light is now pulsating as the speed of the wheel going around.....being...the faster I go the fater it will pulsate so it must be a point on the pad thats triggering the light to go on.

The thing is my brake pads are fine so why would it do this all of a sudden?

__________________
99 C43
98 S420
99 C230K
01 C240

Have you checked the sensor wires to make sure they are not rubbing the rotor?

no havent checked it yet......it just happened last nite.

__________________
99 C43
98 S420
99 C230K
01 C240

It is a simple system. The sensor touches the rotor and bingo, the light comes on. I must admit, I have never seen one pulse as fast as yours does.

__________________
N. Hodges
1994 S350
1987 300 SDL (for sale)

Oh yeah, they do that when the pads are getting down close to the sensors. It will go on like that in the rain for awhile. Then you will start to get a solid indication when you step on the brake hard. Then you will get some flashing going along, and an indication every time you step on the brakes.

Then it will stop. At that point the wear indicators are gone.

You get lots of warning of pad wear. Really a great system - it allows you to plan a long time in advance for pad replacement.

Ken300D

__________________
--------------------------
1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles

The indicator on my W124 flashes when the sensors begin to make contact with the rotor. Wet brakes complete the circuit more effectively than dry (hence light coming on during rainy days).

Also, slight rotor warpage is the reason why it "flashes" instead of staying completely lit.

When I do pull the pads, there is still over a third of the pad left, even after driving 2K or so miles after the light first comes on...

__________________
2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car