Swift L4-1298cc 1.3L SOHC MFI (1997)
EXPANSION SPRING BRAKE
The Expansion Spring Brake (ESB) is used to hold the piston in the upmost (or home) position. The ESB is a spring that is retained in a housing at
a close tolerance. One end of the spring is in contact with the motor drive dog and the other end is in contact with the pinion drive dog. In normal
braking, brake pressure is present on the top of the piston, applying a downward force. The force applies a counterclockwise torque to the motor
pinion which tries to rotate the spring counterclockwise. The counterclockwise torque expands the spring outward within the housing and prevents
gear rotation.
When The Motor Is Activated - and tries to drive the ball screw nut, the end of the ESB is in contact with the motor. The drive dog rotates