Brake warning light on (exclamation mark): parking brake, fluid or pads?
Updated · Autofy
Brake warning light on (exclamation mark): parking brake, fluid or pads?
The red light showing an exclamation mark in a circle means either the parking brake is on or the brake fluid level is too low. Fully release the parking brake first: if the light stays on, check the fluid reservoir under the bonnet. A low level means very worn pads or a leak, and a leak can leave the car without brakes: don't drive, especially if the pedal feels soft. Some cars have a separate amber light for worn pads.
One light, two main causes
This red light watches the braking system as a whole. It comes on when:
- the parking brake is applied, even slightly;
- the brake fluid level drops below the minimum mark.
On recent cars it can also flag a fault in the electronic brake-force distribution, often together with the ABS light. Both lights on at once is a real emergency.
The one-minute test
- Fully release the parking brake, or switch off the electric one. Light goes out? Problem solved.
- Still on? Pull over, open the bonnet and find the brake fluid reservoir (cap often yellow or black, marked with a brake symbol).
- Level between min and max? The sensor or parking brake switch may be at fault. Get it checked, but the brakes work.
- Level below min? Don't set off until you know why.
Why the level drops
The brake circuit is sealed: fluid doesn't evaporate. If it drops, there are only two explanations.
- The pads are wearing. The thinner they get, the further the pistons extend and the more fluid moves into the circuit. A slow, steady drop is therefore normal. If that's it, your pads are near the end: our guide when to replace brake pads covers the signs.
- There's a leak: hose, caliper, master cylinder. Damp marks near a wheel or a sinking pedal give it away. That's dangerous.
When you must not drive
- The pedal feels soft or sinks nearly to the floor.
- The brake light and the ABS light are on together.
- There's a visible leak near a wheel.
In all three cases: call a tow truck.
And the fluid itself
Brake fluid absorbs moisture over time, which makes it less effective when it gets hot. That's why most carmakers ask for it to be replaced about every two years, a service people often forget: see when to change brake fluid.
Keep track of brake wear
Autofy tracks your brakes with a gauge based on the distance driven since the last pad change, and tells you when they're worth a check. Every other light is in our dashboard warning lights guide.