Is it the red Brake light or the yellow Anti-lock brake light?
If it's the yellow one, a diagnostic fault code will be memorized in the ABS computer. Your mechanic will connect a hand-held computer to the car to read the code which will indicate the circuit with the problem.
If it's the red light, only three things will turn it on; the parking brake, the fluid level sensor, and the pressure differential switch. If cornering affects it most, check the level in the reservoir. If it's very low, the front brakes are worn or there's a leak. Don't fill it to the top because there needs to be room to push fluid back when the front brakes are replaced. Also, be absolutely certain you use DOT 3 brake fluid. Absolutely no petroleum products like power steering fluid, transmission fluid, or engine oil. Contamination with these fluids will result in very expensive repairs.
If the fluid level is ok, try holding the parking brake pedal up when the light comes on. If that takes care of it, a cable is sticking, or it could be stretched.
The pressure differential switch only trips if there is a leak in half the system or from incorrect bleeding procedures. All three of these switches can be unplugged to see which one is responsible for your light coming on.
Sunday, April 19th, 2009 AT 3:11 AM