What is Electro-Hydraulic?

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On vehicles with integral antilock brake systems where the piston chamber is an element of the hydraulic control assembly (Teves Mark 2 ABS, Bosch III ABS, Delco Powermaster 3 ABS, Bendix 10, and Jeep ABS), an electrical pump with a nitrogen pressurized accumulator is employed to supply power assist.

In these applications, power assist is provided by pressure stored within the accumulator. We’re talking much pressure here, from 675 to 2,600 psi reckoning on the system and application. When the motive force steps on the pedal and therefore the pushrod moves forward, it opens a valve inside the hydraulic brake cylinder that enables stored pressure from the accumulator to enter a cavity behind the piston assembly. This pushes the piston forward and applies the brakes.

In a pressure activate the cylinder monitors the stored pressure within the accumulator and closes a switch to show on the electric pump when the pressure drops below a preset minimum. It then turns the pump off when pressure is copy to where it should be.

Problems with this kind of power brake will usually result in a foul pump motor, pump motor relay, a leaky accumulator, or internal problems within the piston chamber assembly. Because it’s all a part of the ABS, electrical problems with the pump motor, motor relay, or pressure switch, additionally as low fluid level or depression will usually set a diagnostic trouble code (DTC) and switch on the ABS and/or brake warning lights.

The electric pump and accumulator can usually get replaced separately if there’s a controversy, but the brake cylinder and hydraulic control unit are combined and must get replaced as an assembly (which is incredibly expensive!).

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