Parking brake:
The parking brake pressure is supplied by the accumulator.
Auto retract brake:
The auto retract brake slows down the wheels during retracting to prevent gyroscopic loads and the tries move easily into wheel wells. It is usually actuated by the hydraulic pressure of the landing gear up line.
Auto brake:
This system provides automatic braking after touchdown and at rejected take-off.it can be set on different rates of deceleration but even with MAX setting it does not always provide the shortest stopping distance. It is deactivated by applying manual brakes or by moving the speed brake lever to the DOWN position.