Warning lights

ABS light and brake warning light on together

When both the ABS and brake warning lights come on at the same time, it often points to a more significant hydraulic or sensor issue affecting both systems, and deserves prompt attention.

Difficulty
Moderate
Time
20–40 minutes to check
DIY cost
$10–$40
Pro cost
$150–$600

Symptoms

  • Both ABS icon and red brake icon lit
  • Brake pedal may feel normal, soft, or low
  • Possible uneven braking or pulling

Likely causes

  • CommonLow brake fluidA shared low-fluid sensor can trigger both lights at once.
  • PossibleFaulty wheel speed sensor combined with fluid issueA sensor fault plus low fluid can light both systems together.
  • PossibleFailing ABS/brake control moduleShared electronics between the two systems can trip both warnings.
  • PossibleBrake fluid leak from a caliper, line, or master cylinderA leak lowers fluid and can affect both ABS and normal braking.
  • Less commonParking brake left partially engagedWorth ruling out first since it's the simplest explanation.

What to do

  1. Confirm the parking brake is fully released.
  2. Check the brake fluid reservoir level; top off if low with the correct fluid type.
  3. Look under the car and near each wheel for signs of fluid leaking or wetness.
  4. Press the brake pedal and note if it feels soft, low, or sinks toward the floor.
  5. If the pedal feels normal and fluid is full, have the codes read to find the specific fault.
  6. If the pedal feels soft or low, avoid driving and have the car towed or inspected immediately.
  7. Get any leak repaired and the system bled by a mechanic before driving normally again.

Tools and parts

Brake fluid, DOT rating specified by owner's manualSearch: “DOT 3 or DOT 4 brake fluid for your car”

When to call a pro

See a mechanic right away when both lights are on together, especially if the pedal feels different than usual.

Safety

Use caution

If the brake pedal feels soft or sinks at all, do not drive the car; a fluid leak can lead to sudden brake failure.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.