The BMW Brake Pad Wear Sensor is a new component on your vehicle that makes it easier for the owner to keep their car in proper working condition. No one desires to be in a vehicle that has their braking system impaired by lack of proper periodic maintenance.
In the past the only way an owner could know if their brake pads were worn out was to visually inspect them or observe the hydraulic fluid level in the brake master cylinder. While these two methods can still be done, the brake pad wear sensor is also now present on BMW models.
The actual function of the BMW brake pad wear sensor is to send a signal to the dashboard of the vehicle when the amount of padding martial in the braking system has reached a predetermined point. This way the BMW driver and owner is aware of the current amount of braking material they have left. This sensor is not a function of time but of actual material.
The brake pad wear sensor can become illuminated with a false reading by the end of the sensor being covered by the dust the padding material produces when it is performing its duty. It can also go off if the wire connecting the sensor to the onboard computer is cut for any reason. For the owner of the BMW to verify the reading from the brake pad wear sensor is to check the fluid level in the brake master cylinder. This only takes about a minute. If the brake fluid is low, then the sensor is illumination and warning of changing the pads should be heeded.
The brake pad wear sensor is one of the new innovations now standard on vehicles to make driveing the vehicles as safe as possible for the occupants.