Principles of Operation

Principles of Operation

Hydraulic Brake System
Applying the brake pedal uses lever action to push a rod into the brake booster, which through the use of vacuum, boosts the force of the rod and then transmits this force into the master cylinder. This produces hydraulic pressure in the master cylinder. On vehicles not equipped with anti-lock brake systems (ABS), the hydraulic pressure is transmitted by brake fluid through the brake lines to the individual brake calipers or wheel cylinders. On vehicles equipped with ABS, the hydraulic pressure is transmitted by brake fluid through the brake lines to the ABS hydraulic control unit (HCU), which then distributes that pressure to the individual brake calipers or wheel cylinders. The brake calipers or wheel cylinders use hydraulic pressure to apply the pads or shoes. The application of the brake pads or shoes will cause the rotation of the wheels to slow or stop depending on how much brake pressure is applied. The parking brakes carry out the same function except that they are mechanically actuated by a cable that connects only to the rear brakes.

Programming Adjustable Pedal Positions
Programming adjustable pedal positions can be accomplished by performing these steps:
^ An adjustable pedal position can be stored at any time. To store the adjustable pedal position to memory, the driver must move the pedals to the preferred position using the adjustable pedal switch. The driver must then press the memory SET switch, activating the memory SET switch light emitting diode (LED). Within 5 seconds (before the LED goes out) the driver must select a memory position. Memory No. 1 is selected by pressing the 1 switch. Memory No. 2 is selected by pressing the 2 switch.
^ If no memory switch input is received within the 5 second time limit, the operation is aborted and the memory SET switch LED is turned OFF. If one of these inputs is received during the 5 second programming limit, the operation is aborted and the memory SET switch LED is turned OFF:
- Adjustable pedal switch
- Power driver seat switch
- Power outside rearview mirrors switch
- Memory SET switch

Recalling a Stored Adjustable Pedal Position
Once the driver has stored a preferred adjustable pedal position, the driver can recall the setting by pressing the corresponding memory switch, or by using a programmed remote transmitter. Recalling a stored adjustable pedal position can be accomplished by performing these steps:
^ The driver can recall a preferred adjustable pedal position by pressing one or both of the memory recall switches. Pressing memory switch 1 will initiate a recall of the adjustable pedal position stored in memory No. 1. Pressing memory switch 2 will initiate a recall of the adjustable pedal position stored in memory No. 2.
^ A remote transmitter can be used to recall previously set memory positions. The remote transmitter assigned with personality 1 is capable of only recalling memory position 1. Similarly, the remote transmitter assigned with personality 2 can only recall memory positions 2.
^ Memory recall occurs when the UNLOCK switch is pressed on the remote transmitters. A second press of the UNLOCK switch, which unlocks the passenger doors, does not initiate a memory recall.
^ A memory recall in progress does not prohibit the initiation of another memory recall; the most recently requested memory recall will be executed.