Brake Pad Life Estimator
Enter your brake pad details to estimate remaining life in miles and months, pad status, and replacement cost.
| Thickness | Status | Action |
|---|---|---|
| 10–12 mm | New | No action needed |
| 6–10 mm | Good | Monitor regularly |
| 4–6 mm | Worn | Start budgeting for replacement |
| 2–4 mm | Replace Soon | Schedule service within 2–3 months |
| 0–2 mm | Critical | Metal on metal — replace immediately |
How Disc Brakes Work
When you press the brake pedal, hydraulic fluid pushes caliper pistons against the brake pads, clamping them onto the spinning rotor. The friction between pad and rotor slows the wheel. Over time, the friction material on the pad wears away. Most pads include a metal wear indicator that produces a high-pitched squeal when the pad reaches ~2mm — your warning to replace them immediately.
What Causes Fast Brake Pad Wear
City driving is the biggest factor — frequent stop-and-go traffic generates far more heat cycles than highway cruising. Heavier vehicles require more braking force. Cheap economy pads use softer compounds that wear faster. Aggressive driving habits — late hard braking rather than gradual slowing — dramatically increase wear rate and heat buildup.
Brake fade occurs when pads and rotors overheat, temporarily reducing stopping power. This is common when descending long hills without engine braking, or on track days with street pads.
When to Also Replace Rotors
Rotors typically last through two pad changes under normal driving. However, replace rotors if they are below minimum thickness (stamped on the rotor hat), show deep grooves or hot spots, or have surface cracks. If you hear metal grinding rather than a squeal, the rotor is likely already scored and will need replacement along with the pads.