You're about to drive a vehicle fitted with air-assisted hydraulic brakes. Why might the brake pedal feel hard when you press it? You're about to drive a vehicle fitted with air-assisted hydraulic brakes. Why might the brake pedal feel hard when you press it?

• Possible answers:

   
• A. The air compressor is not working
• B. The pedal movement needs adjusting
• C. The brakes are locked on fully
• D. The brake-fluid reservoir is empty