You're about to start a journey in very frosty weather. What's the likely cause of low air-brake pressure? You're about to start a journey in very frosty weather. What's the likely cause of low air-brake pressure?

• Possible answers:

   
• A. Engine temperature too low
• B. Weak engine anti-freeze mixture
• C. Brake pedal needs adjustment
• D. Frozen moisture in the storage tanks