Coast Clutch

Fig 1: Disassembled View Of Coast Clutch

Courtesy of MAZDA MOTORS CORP.

The coast clutch is a multi-disc clutch made up of steel and friction plates.

• The coast clutch is applied with hydraulic pressure and disengaged by return springs and the exhaust of the hydraulic pressure.
• The coast clutch is housed in the front brake and coast clutch drum.
• The coast clutch is applied when the transmission control switch (TCS) is on and 5th gear is inhibited.
• The coast clutch is hydraulically applied when the transmission is in 2nd and 1st position.
• When applied, the coast clutch locks the input shaft to the front planetary carrier, thus preventing the one-way clutch from overrunning when the vehicle is coasting.
• This allows the use of engine compression to help slow the vehicle and provide engine braking.