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The brake pedal feels spongy when pressed
The brake pedal feels hard when pressed
The brake pedal has little resistance
The brake pedal travels a long way
Explanation: The pump creates a vacuum in the servo unit. This reduces the amount of pressure you need to apply to the brake pedal. Without this vacuum, it's extremely difficult to press the brake pedal down.
Category: Braking Systems
References: The Official DVSA Guide to Driving Buses and Coaches: Section 2, The Official DVSA Guide to Driving Goods Vehicles: Section 2
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