Final answer:
To recharge the brake accumulator, a hydraulic pump is used to supply fluid at high pressure, which is then stored in the accumulator.
Step-by-step explanation:
When the brake accumulator pressure is low at the gate, it needs to be recharged. The brake accumulator is responsible for maintaining the hydraulic pressure in the brake system. To recharge the brake accumulator, a hydraulic pump is used to supply fluid at high pressure, which is then stored in the accumulator.
In some systems, the hydraulic pump is driven directly by the engine, while in others it may be powered by an electric motor or even by the vehicle's kinetic energy through regenerative braking. The pump pressurizes the fluid and sends it to the accumulator, where it is stored until needed.
When the brake pedal is pressed, the fluid from the accumulator is released to apply the brakes. Once the pressure in the accumulator drops below a certain threshold, the pump automatically kicks in to recharge it, ensuring that there is always enough pressure for effective braking.