On my '13 XFR, I had a brake low indicator warning a few days ago at a little over 13,000 miles. However, after turning the car off and turning back on, the indicator disappeared.

As I understand it, once the sensor wire is worn through, there is no way for the indicator to be "cleared" unless you replace the sensor or bridge the contacts.

With that in mind, is it reasonable to say that my brakes are probably still fine, and that it was a temporary electronic fault?

 

Why don't you simply whip the wheels off and have a look at the brake pads?
With a bit of wriggling and a torch you can see the sides/edges of the pads and see how thick they are. 4 mm or thicker is plenty.

 

Mine behaved the same. I think it might be due to the rotor completing the broken circuit under some conditions.

 

Gotcha... yeah was planning to do that this weekend, but the brake warning light just came on again, and from looking at the rear pads at an angle through the wheel spokes, they do look pretty thin.

 

Youre just at the point where the contact is being made between the sensor and rotor. As it wears more it will stay on. When it starts it can come and go. Its a gound circuit with the rotors so when the rotor completes the path to ground it triggers the warning not the other way around

 

Mr. Brutal:
I would normally take your word as gospel, BUT when my sensor got cut, i eliminated it in the circuit by shorting the two wires going to it to shut off the light. With the sensor hanging in air, the light was still on. So, I agree that it is a grounding circuit, but I believe the ground connected and then is disconnected when the circuit is cut. It does not make sense, but that seems to be the way it is!

 

It also looks at key cycles Ross, just like SOME, CEL codes will turn the CEL light off if it doesnt see the fault on key cycles but still retains the code. If it doesnt see the ground contact being made it can and does shut the light off. It is looking for the constant completed ground to keep the warning on, So again if after(how every many cycles Jaguar set) it doesnt see the ground it turns the light off, this is why there is NO RESET NEEDED AFTER REPLACING BRAKES AND WORN SENSOR.