First of all, pedal height refers to the brake pedal's distance from the floor. If it's not within the specified range, inspect the brake pedal, pedal arm, mounting bracket, and dash panel for damage. Adjust the brake light switch if necessary. To measure pedal height, start the engine, press the accelerator, and measure with the carpet pulled back and the pedal pad removed. Pedal free-play is the slack before the brake system is engaged. If incorrect, adjust the brake light switch or check the brake system. Pedal reserve height is the pedal's distance from the floor when fully depressed.