A dashboard light appearing when brake pedal is depressed usually means brake fluid is low.
check the brake pedal, there is a switch on the back of the pedal that depressed when the brake is depressed that turns the lights on, when this is loose it keeps the lights on.
Check rear bulbs, rear brake bulb fuse, and check the swith on the brake pedal.
Brake lights are on continuously while you are driving. Every time the brake pedal is depressed.
ckeck for vac. leak at brake booster
Check the proportioning valve.
Possibly the brake light switch at the brake pedal has stayed depressed or stuck.
If both brake light bulbs fail to come on when the brake is depressed I'd check first to see if there may be a fuse that controls the brake light circuit. If there is no fuse and/or the fuse appears to be okay, the most likely culprit is a faulty brake light switch. This switch is located up and behind the brake pedal. There is a plunger that moves in and out acting as a switch when the brake pedal is depressed. It is this switch which possibly may be the culprit.
It is because the brake light switch under the brake pedal is faulty. usually replacing this will solve the problem. it is designed in such a way that when the brake pedal is depressed the switch completes a circuit and the lights come on. the fault occurs when the switch closes the circuit even though the pedal is not depressed. hope this helps.
The brake pedal has a hinge or pivot pin, give it a shot of lubricant,should stop squeaking.
The brake pedal electrical switch can be found below the dashboard in the passenger compartment. The switch will be on the drivers side of the dashboard.
Check the brake switch under your pedal (which needs to be pushed when the brake pedal is depressed). This is what the problem was on my friends Sentra. As long as you have checked the lights and fuses, this should do it.