Automatic transmission brake band piston rod
Purpose:
*Transmits hydraulic pressure from the brake master cylinder or transmission control module (TCM) to the brake band piston.
* Controls turning the brake band on and off.
Design:
* Consists of a metal rod (rod) with O-rings at the ends.
*One end is connected to the brake band piston and the other is connected to the hydraulic line.
Working principle:
* When the TCM applies hydraulic pressure to the piston rod, it moves to push the brake band piston.
* The piston, in turn, compresses the brake band, creating friction between the band and the transmission drum.
* This stops the drum from rotating and provides braking.
* When hydraulic pressure is released, the spring pulls the piston rod back, releasing the brake band.
Malfunctions:
* Worn or damaged O-rings can cause hydraulic fluid to leak and reduce braking performance.
* A clogged piston rod may prevent the brake band piston from moving correctly.
* A weakened spring can cause the brake band to not fully release, causing slipping or overheating.
Consequences of the malfunction:
* Poor braking
*Transmission slipping
*Transmission overheating
*Transmission damage