Usually this is caused by the brake light SWITCH being out of adjustment in relation to the brake pedal arm which pushes on a plunger in the switch to operate it.
Different makes and models of vehicles have different means of mounting and adjusting the brake light switches, so the adjustment will depend on your vehicle.
The most probable cause of both lights being on at the same time is a malfunction of each system. The brake light may illuminate because of a problem with the ABS unit, or because of low brake fluid. The battery light may illuminate because of a problem with the charging system, such as a malfunctioning alternator or dying battery. It could also be a problem common to both lights, such as a bad ground somewhere or an ECU problem.
It could be a blown fuse. Tail lights and brake/turn are on separate fuses. Apparently there is not a ground problem since brake/turn works OK.
Brake Lights do not turn offUsually this is caused by the physical position of the brake light switch not being adjusted properly.
nothing it could just be the tail lights coming on.
Check bulbs they are double filamented with smaller for brake lights Could be a problem in steering column
Brake pedal switch, wiring, bulbs, bad trailer harness (if there), fuses...
Check the bulbs. If these are OK it could be the switch on the brake pedal arm.
It could be, along with broken wires, unplugged connections, failed switches,
On a toyota tacoma 2003 SR5 when the tail lights are turned on the brake lights come on and when the tail lights are of the brake lights work just fine what could be the problem. If the truck has a trailer plug, inspect the plug and plug wiring for damage and corrosion.
2 things could be the problem. If the "Brake" light is on that usually comes on when you set the parking brake then it could be the brake fluid is low. Check that. If it is the "Brake Lamp" light then check your brake lights. 1 of them could be out.
It could, if the lights are on all the time.
Could be a battery problem, discharged, dead or dirty/loose battery connections.