Brake System Warning Light: what it means and what to do
Color: Red
Urgency: Urgent if parking brake is off.
What it means
The parking brake is on, brake fluid is low, or there is a hydraulic brake problem.
Is it safe to drive?
First make sure the parking brake is fully released. If the light stays on, or the pedal feels soft, do not drive: have it towed or inspected.
Likely causes
- Parking brake engaged
- Low brake fluid (often worn pads or a leak)
- Brake fluid leak
- Failing master cylinder
- Brake pad wear sensor (some cars)
Typical cost ranges
Rough general estimates for US shops (parts and labor). Your price depends on vehicle, region, and shop.
| Repair | Rough range |
|---|---|
| Brake fluid flush | $90–$200 |
| Front pads | $150–$350 per axle |
| Pads and rotors | $300–$800 per axle |
| Master cylinder | $300–$800 |
What to tell the shop
Describe pedal feel (soft, sinking, grinding) and ask them to measure pad thickness in millimeters before agreeing to rotors.
Frequently asked questions
What does the Brake System Warning Light mean?
The parking brake is on, brake fluid is low, or there is a hydraulic brake problem.
Is it safe to drive with the Brake System Warning Light on?
First make sure the parking brake is fully released. If the light stays on, or the pedal feels soft, do not drive: have it towed or inspected.
What causes the Brake System Warning Light to come on?
Common causes include: Parking brake engaged; Low brake fluid (often worn pads or a leak); Brake fluid leak; Failing master cylinder; Brake pad wear sensor (some cars).
How much does it cost to fix the Brake System Warning Light problem?
Rough general estimates: Brake fluid flush: $90–$200; Front pads: $150–$350 per axle; Pads and rotors: $300–$800 per axle; Master cylinder: $300–$800. Actual costs vary by vehicle, region, and shop.
What should I tell the mechanic?
Describe pedal feel (soft, sinking, grinding) and ask them to measure pad thickness in millimeters before agreeing to rotors.
General information only, not professional mechanical advice. Check your owner's manual, and if in doubt, stop safely and call for help.