This tool provides general guidance — not professional mechanical advice. Always have a qualified mechanic inspect your vehicle before making any repair decisions.
#1 Most Likely
Brake pedal sinks to floor
Typical Cost
$150 – $1,500
Brake master cylinder replacement typically costs $320–$600 per industry repair data (2024). Brake line repair or replacement may cost $150–$500 depending on extent. Full brake system repair in severe cases may cost $800–$1,500 or more. Urgency reflects worst-case cause (brake failure). Prices vary by vehicle make and region.
Wide range because the exact repair depends on what's causing the symptom.
- Failed brake master cylinder (internal bypass)
- Ruptured brake line or hose causing rapid fluid loss
- Severely leaking brake caliper or wheel cylinder
- Complete brake fluid loss
A brake pedal that sinks all the way to the floor — or nearly so — with little or no resistance may indicate a failed brake master cylinder, a severe brake fluid leak, or a ruptured brake line. This is a brake system emergency. Continued driving with this symptom may result in complete inability to stop the vehicle.
What a mechanic will check
A mechanic will likely immediately inspect all brake lines, calipers, and wheel cylinders for leaks, test the master cylinder, and check brake fluid level. This symptom commonly requires the vehicle to be towed rather than driven to a shop.
What to say to your mechanic
“My brake pedal sinks almost to the floor when I press it and the car barely stops. Can you inspect my entire brake system — master cylinder, brake lines, and calipers — to find what may have failed? I am concerned this may not be safe to drive.”
Script based on industry repair procedures
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