Hybrid, electric, and start-stop technology vehicles commonly use regenerative braking to capture kinetic energy that would otherwise be lost as heat from friction. The regenerative and hydraulic brakes in these systems use computer controls with input from various sensors. The transfer of physical pressure from the brake pedal to the master cylinder will only occur in fail safe mode. Note: When a failure occurs, a brake warning light will come on. The brakes will still work, but the pedal will be harder to push and the stopping distance will increase.