Oil on the brakes
The brakes out of adjustment
The brakes overheating
Air in the brake fluid
On steep hills, you’ll normally need to reduce speed. Change down to a lower gear to give yourself more braking power and control.
By selecting a lower gear, you should be able to avoid using your brakes too much. Excessive braking on hills can result in ‘brake fade’ and loss of control. Brake fade is a loss of braking power caused by the heat generated by continuous use of the brakes.
Look for ‘escape lanes’, which are designed to stop runaway vehicles.