When brake pressure is applied, the pistons are forced out pushing the shoes into contact with the drum.

If the car is not moving where the driver wants, the computer applies brake pressure to individual tires to bring the vehicle under control.

At the first sign of a skid, the pilot should release brake pressure and allow the wheels to spin up.

A warning light had come on, indicating low brake pressure.

The vehicle's computer applies just enough brake pressure to prevent the car from rolling backwards.

If the computer determines that the driver is losing control, it applies brake pressure to individual tires to restore order.

A final major factor is the brake pressure of the many trim brakes throughout the ride.

The anti-skid system will modulate brake pressure to keep all wheels turning.

The system measures 18 driving conditions, each of which suggests a need to increase or decrease brake pressure.

Here, applied brake pressure at the front is contributed to the rear wheel and vice versa.