Brake band 60mm, automatic transmission AW TF-80SC TF-81SC 2005-up used U3-BRB-TF80SC

Brake band - a device by means of which planetary gear set elements are blocked.

Despite its small size, the band has a sufficiently strong holding power. As the brake shoe, the band uses the effect of "self squeezing". When the band is released, push of the gear shift is mitigated. When the band is released - it seeks to free itself quickly.

Basic features of the brake band:

- A large holding capacity despite its small size;

- Locking of planetary train rotating elements on the automatic transmission case;

- softening jerks and thumps when shifting.

The principle of operation of the brake band.

One end of the brake band is fixed motionless on the automatic transmission housing and the other is attached to the piston servodrive (actuator). The band is driven by a hydraulic cylinder located inside the automatic transmission. Blocking is performed by feeding oil into the chamber enabling the servo. The piston actuator under oil pressure squeezes the brake band  blocking planetary gear set part.

Unlocking is performed by applying oil to the servo chamber, thereby equalizing the oil pressure in the two cavities. When the piston moves the actuator return spring to its initial position, the brake band is released