Power Steering - How Car Steering Works

There are a couple of key components in power steering in addition to the rack-and-pinion or recirculating-ball mechanism. Pump The hydraulic power for the steering is provided by a rotary-vane pump (see diagram below). As the vanes spin, they pull hydraulic fluid from the return line at low pressure and force it into the outlet at high pressure. The pump contains a pressure-relief valve to make sure that the pressure does not get too high, especially at high engine speeds when so much fluid is being pumped. Rotary Valve A power-steering system should assist the driver only when he is exerting force on the steering wheel (such as when starting a turn). The key to the rotary valve is a torsion bar. The input from the steering shaft forms the inner part of a spool-valve assembly. Animation showing what happens inside the rotary valve when you first start to turn the steering wheel As the bar twists, it rotates the inside of the spool valve relative to the outside.

eps system toe in toe out camber castor angle simple brake diagram Internal resistance abs with modulator Plenum chamber Brake Proportioning Valve – Auto Repair Help THE BRAKE PROPORTING VALVEby Jim Miller When diagnosing wheel lockup, one item you’ll want to inspect is the brake proportioning valve. The brake proportioning valve is used to balance front and rear brake loads during periods of hard braking. When the weight of the vehicle shifts towards the front of the vehicle during the quick deceleration of hard braking, the rear wheels have a tendency to lose traction. The proportioning valve is able to reduce pressure to the rear brakes to prevent rear wheel lock up when the brakes are heavily applied. The proportioning valve is usually mounted near the master cylinder. The metering valve is used on disc/drum combination brake systems to control front brake lock up during initial braking. (Jim is a lifelong fan of Dodger Baseball and used to race sprint cars in the 1980s.)

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