Symptom guide
Brake Warning Light On
What to check when the red brake warning light appears.
Quick answer
A brake warning light can indicate the parking brake is on, low brake fluid, hydraulic pressure imbalance, worn pads on some vehicles, or an ABS/brake system fault.
Most likely causes
- Parking brake not fully released
- Low brake fluid
- Brake fluid leak
- Hydraulic pressure issue
- Sensor or switch fault
Basic driver checks
- Confirm the parking brake is fully released.
- Check brake fluid level without contaminating the reservoir.
- Look for wetness near wheels or under the car.
- Feel whether the pedal is soft or sinking.
DIY diagnostic path
- Do not drive with a sinking pedal.
- Do not add fluid without looking for leaks or worn brakes.
- Use the correct brake fluid type only.
- Tow if braking feels unsafe.
Common mistakes
- Ignoring a red brake warning
- Assuming it is the same as ABS light
- Topping up fluid repeatedly without finding the cause
What to tell the mechanic
Tell the shop whether the pedal changed, fluid is low, ABS light is also on, or the light appeared after brake work.