A performance-based brake tester (PBBT) is a machine that assesses the braking performance of a vehicle.

PBBT devices include roller dynamometers (roller-dyno) and flat plate brake testers. Each device can determine brake forces without restriction to the brake type (disc vs. drum) or energy supply (air, hydraulic or electric).

In addition, PBBTs based on mechanical or electronic decelerometers can assess the overall vehicle braking capability through a stopping performance test in which deceleration and/or stopping distance is obtained, also independent of brake type or application method.