Question Topic: Braking Systems
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Explanation: A fault in the vacuum pump could be the cause of a stiff brake pedal. There could also be a leaking connection allowing air into the vacuum. Don't continue your journey until the fault has been fixed.
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