A friend who was assisting me when I was replacing my front disc brake pads, seeing an electrical cable connected to the brake assembly told me he believed it was for a dashboard warning light of brake pad wear. In the owner's manual however there is no reference to any such warning light system.
Is there one? Or, perhaps, is the wiring present but the warning system only applicable to certain models?
Thanks.

 

I owned X300 and mine had no indicators , I later read thru these forums and for a quirk reason they discontinued brake pad wear sensor , I really say quirk because my XJ40 came with these and a newer model doesn't

 

As said, the XJ40 had them, what a NIGHTMARE.

Earler models (pre XJ40), no got, late rmodels (post XJ40), no got.

Common sense finally kick in.

I bridged out the pad sensor wires on the XJ40. It was the only way of killing the constant pad wear messages.

The wire/s you saw belong to the ABS sensors.

 

Thanks to you both for that, much appreciated.

Brian

 

I have noticed that the fluid reservoir capacity seems somewhat related to the displacement of the calipers when the pads are worn.

If the fluid does NOT leak, then the low fluid level should come ON when the pads wear to min.

If the HELPFUL mechanics at the LUBE centers and repair shops 'top-off' the fluid levels, it defeats this entirely.

The XJ40 reservoir did NOT have this feature because the fluid was also used as the hydraulic fluid for the brake booster power assist.

The fluid reservoir was HUGE by comparison to supply the electric/hydraulic unit and calipers.

Just a thought??

bob gauff

 

I used to own a 1990 7 series BMW and it was fitted with the brake pad wear sensors, until it came time to fit new pads. The standard ones were a fraction of the cost of the sensor ones, so, I preferred to inspect the pads manually during routine servicing and save a wad of money in the process.