Symptom guide
Brake Pedal Goes to Floor
Why a sinking brake pedal is urgent and what it can mean for hydraulic braking.
Quick answer
A pedal that sinks to the floor often points to low brake fluid, a leak, air in the system, master cylinder failure, or severe hydraulic problems.
Most likely causes
- Brake fluid leak
- Air in brake lines
- Master cylinder internal leak
- Failed brake hose
- Severely worn brake components
Basic driver checks
- Check brake fluid level without spilling fluid on paint.
- Look under the car and near wheels for fluid.
- Notice whether the brake warning light is on.
- Do not pump the pedal and keep driving.
DIY diagnostic path
- Arrange towing instead of driving.
- Do not top up fluid and assume the problem is fixed.
- Keep brake fluid away from skin and paint.
- Do not open hydraulic fittings without proper repair process.
Common mistakes
- Driving to test if brakes come back
- Only adding fluid without finding the leak
- Confusing this with normal ABS pedal feedback
What to tell the mechanic
Report whether the pedal suddenly sank, whether fluid is low, and whether leaks are visible at any wheel.