This system uses either hydraulic pressure generated by an engine-driven pump or an electric motor to multiply the force applied to the steering linkage. It allows heavy vehicles to be maneuvered easily at low speeds while maintaining high-speed stability. If the assist fails, the vehicle remains steerable but requires significantly more physical strength to turn the wheel.
Heard on the job
Check the fluid level first, because that whining noise usually means the power steering pump is starving.
Insider tip
A sudden heavy steering feel during low-speed parking maneuvers is the classic symptom of a slipping accessory belt or a failing hydraulic pump.
Also heard as
- power-assisted steering
- PAS
Do not mix it up with
- EPAS: EPAS is a specific type of power steering that uses an electric motor rather than a traditional hydraulic pump.