Braking distance measures braking safety. It is the physical distance the vehicle covers after the brakes are applied. It is determined by tire traction, brake caliper clamping force, vehicle weight, and road conditions. Do not confuse it with stopping distance, which also includes the driver's reaction time distance.
Braking distance increases exponentially with speed. If you double your speed, your braking distance increases by four times. Mechanics improve braking distance by replacing worn pads and rotors, bleeding air out of the hydraulic lines, and installing tires with better grip. Worn shock absorbers also increase distance by letting the vehicle weight shift forward unevenly, lifting the rear tires.