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You are driving down a long steep hill. You suddenly notice your brakes are not working as well as normal. What is the usual cause of this?

A The brakes overheating
This is more likely to happen on vehicles fitted with drum brakes but can apply to disc brakes as well. Using a lower gear will assist the braking and help you to keep control of your vehicle.
B Air in the brake fluid
C Oil on the brakes
D Badly adjusted brakes