The Lexus ES300 Power Steering Pump serves to reduce the steering effort by converting the power of the engine to hydraulic pressure to assist with every twist of the wheel. Mounted on the engine and run by a belt, the Power Steering Pump draws fluid from a reservoir, pressurizes it, and then pushes it through a high-pressure hose to the steering gear where a valve sends the force to the rack piston. Early ES300 units had an on-pump reservoir, but later models had a remote tank which was connected by a low-pressure hose to reduce heat and vibration. All versions have the same hydraulic principle, though some newer units have the addition of an electronic flow valve to vary the amount of assist according to speed, creating the easy parking feel of a Lexus sedan, but not over-boosting response on the highway. A well-maintained Lexus ES300 Power Steering Pump delivers smooth, quiet assistance. Common symptoms of a failing Power Steering Pump include whining, leaks, belt squeal, and heavy steering at low speed, so it is a warning for ES300 owners that you don't ignore signs that your Lexus Power Steering Pump may go out suddenly.
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