CVVL Brake Unit

Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC

The brake unit is a slave cylinder that converts the hydraulic pressure of the pump into the movement of the intake valve via a hydraulic valve lash adjustment element. The brake unit design not only gives a controlled closure of the valve but also enables a rapid opening speed as the braking element of the unit is by-passed by the use of a check valve during the opening phase.

It is a critical part of the unit set up that the valve lash adjustment is reset if the unit is removed from the cylinder head.

Where it is necessary to remove and refit the CVVL unit, the brake pistons must be reset by pressing down all CVVL brakes to make sure that they are all in the reset position using the Jaguar Land Rover special tool (CVVL guide pins - JLR-303-1639). Once the unit has been reset and the tool removed a visual check that the piston is sitting inside the sleeve should be made. The tool will reset the brake unit position from A to position B as in figure E202344

Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC