Thread: Brake warning light

I would never discount JDNSW's theory.

As I mentioned this used to happen in my 2001 110 on steep downhills (although not on my 2005 90). The vehicle brakes system appeared all ok (it was only a couple of years old) and the fluid level was ok. I put it down to the angle of the fluid moving forward in the reservoir.

Originally Posted by JDNSW

I have an idea that the warning light warns of two distinct problems. One is low fluid, but the second is an excessive difference in fluid movement between front and back circuits. This will be due to either a fluid leak in one of the circuits, or excessive movement of one piston, usually due to something pushing the piston back too far prior to the application of the brakes. This will be either a stone or mud wedged under the pad or free play on the wheel bearings. (Or, very unlikely, a loose calliper) Of course, another, quite possible cause, is a wiring fault!

John

John - I wonder whether the clicking noise I have had was a piston sticking, is that possible?