What happens to power steering and power brakes when the engine stalls?

When the engine stalls, the power steering and power brakes cease to function as they normally would. This is primarily because both systems rely on the engine's power to operate. Power steering typically uses a hydraulic pump driven by the engine to assist in steering, and when the engine is off, this pump becomes inoperative, making the steering feel significantly heavier and more difficult to maneuver.

Similarly, power brakes utilize vacuum pressure created by the engine to enhance braking force. When the engine stalls, this vacuum pressure is lost, resulting in a reduction in braking efficiency. The driver would still have a limited ability to brake, primarily through the mechanical brakes, but they would require significantly more effort to apply.

Understanding this concept is crucial for drivers to recognize that losing engine power affects their vehicle's handling and braking capabilities, which is vital for maintaining control in emergency scenarios.