Brake lights are always on on 2002 Suzuki Grand Vitara. We have replaced brake light switch 3 times. We also replaced hydraulic shift sensor bolted to shifter. There is only one hot wire going to taillights and 4 of the wires are ground wires, is that right? We pushed brake light switch in by hand with a screwdriver and the lights still stay on.

SOURCE: 2002 suzuki grand vitara brake warning goes on and off

Do you have a brake fluid accumulator(ABS)? If yes, the pistons/pulsing assembly are worn, and may need to be replaced.

If not, you may have a vacuum leak in the power booster (located on the firewall). Check all hose and clamps for a tight fit/cracks,etc. Vacuum leaks cause intermittent brake failure lights.

You may want to park the vehicle on a clean surface, pump the brakes a few times, and check for brake fluid leaks. If there is a leaking wheel cylinder (back brakes) , caliper (front brakes), or brake line, you will be able to see it.

Leaks cause pressure loss, and, thus, the brake warning light will illuminate.