Modern vehicles rely on a host of fluids to send us down the road. Some, like engine oil and coolant, are well-known, while others, like differential fluid, are less-familiar to average motorists.

The power-steering pump pressurizes the hydraulic fluid that helps the driver turn ... but because their pumps rob power and efficiency even when the car isn’t turning, a small percentage ...

However, if the power fails for whatever reason, the steering does not just become “unassisted “– it also becomes “resisted” by the hydraulic fluid that was used to provide the power.