Table of Contents
Advertisement
2003 Chevrolet Corvette Restoration Kit
Park Brake System Description and Operation
System Component Description
The park brake system consists of the following:
. Park Brake Lever Assembly
Receives, multiplies, and transfers park brake system apply input force from operator to park brake
cable system.
Releases applied park brake system when lever is returned to at-rest, lowered, position.
Park Brake Cables
Transfers input force received from park brake lever, through park brake cable equalizer, to park
brake apply levers.
Park Brake Cable Equalizer
Evenly distributes input force to both the left and right park brake units.
Park Brake Apply Lever
Multiplies and transfers input force to park brake actuator/adjuster.
Park Brake Actuator/Adjuster
Uses multiplied input force from apply lever via the cables to expand park brake shoe toward the
friction surface of the drum-in-hat portion of the rear brake rotor.
Threaded park brake actuators/adjusters are also used to control clearance between the park brake
shoe and the friction surface of the drum-in-hat portion of the rear brake rotor.
Park Brake Shoe (Rear
Disc,
Drum-In-Hat System)
Applies mechanical output force from park brake actuator/adjuster to friction surface of.the drum-in-
hat portion of the rear brake rotor.
System Operation
Park brake apply input force is received by the park brake lever assembly being applied. The input force
is multiplied by the lever assembly, transferred, and evenly distributed, through the park brake cables and
the park brake cable equalizer, to the left and right park brake apply levers. The park brake apply levers
multiply and transfer the apply input force to the park brake actuators. The park brake lever assembly
releases an applied park brake system when it is returned to the at-rest, lowered, position.
ABS Description and Operation
Antilock Brake System
When wheel slip is detected during a brake application, the ABS enters antilock mode. During antilock
braking, hydraulic pressure in the individual wheel circuits is controlled to prevent any wheel from
slipping. A separate hydraulic line and specific solenoid valves are provided for each wheel. The ABS can
decrease, hold, or increase hydraulic pressure to each wheel brake. The ABS cannot, however, increase
hydraulic pressure above the amount which is transmitted by the master cylinder during braking.
During antilock braking, a series of rapid pulsations is felt in the brake pedal. These pulsations are
caused by the rapid changes in position of the individual solenoid valves as the EBCM responds to wheel
speed sensor inputs and attempts to prevent wheel slip. These pedal pulsations are present only during
antilock braking and stop when normal braking is resumed or when the vehicle comes to a stop. A ticking
or popping noise may also be heard as the solenoid valves cycle rapidly. During antilock braking on dry
pavement, intermittent chirping noises may be heard as the tires approach slipping. These noises and
pedal pulsations are considered normal during antilock operation.
Page 38
Advertisement
Table of Contents
