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Engine Operation
2.2L  3100 / 3400 
3.5L  3800 
4200  4.3L Vortec

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Basic Brake System Operation And Description
The hydraulic brake system consists of the following:

Hydraulic Brake Master Cylinder Fluid Reservoir: Contains supply of brake fluid for the hydraulic
brake system.

Hydraulic Brake Master Cylinder: Converts mechanical input force into hydraulic output
pressure. Hydraulic output pressure is distributed from the master cylinder through two hydraulic
circuits, supplying diagonally-opposed wheel apply circuits.

Hydraulic Brake Pressure Balance Control System: Regulates brake fluid pressure delivered to
hydraulic brake wheel circuits, in order to control the distribution of braking force. Pressure
balance control is achieved through dynamic rear proportioning (DRP), which is a function of the
ABS modulator. Refer to ABS Description and Operation for specific information on the operation
of DRP.

Hydraulic Brake Pipes and Flexible Brake Hoses: Carries brake fluid to and from hydraulic brake
system components.

Hydraulic Brake Wheel Apply Components: Converts hydraulic input pressure into mechanical
output force.

System Operation
Mechanical force is converted into hydraulic pressure by the master cylinder, regulated to meet
braking system demands by the pressure balance control system, and delivered to the hydraulic
brake wheel circuits by the pipes and flexible hoses. The wheel apply components then convert
the hydraulic pressure back into mechanical force which presses linings against rotating brake
system components.