AT-102 AUTOMATIC TRANSMISSION — Component Parts (Second Brake) 2. INSTALL PISTON RETURN SPRING (a) Install the piston return spring. (b) Install the spring retainer. (c) Place SST on the spring retainer, and compress the return spring with a shop press. SST 09350-30020 (09350-07040) (d) Install the snap ring with snap ring pliers. 3. CHECK SECOND BRAKE PISTON MOVING Make sure the second brake piston moves smoothly when applying and releasing low pressure compressed air to the second brake drum. 4. INSTALL THRUST WASHER Coat the thrust washer with petroleum jelly and install it. HINT: Make sure that the cutout portions of thrust washer match teeth of the spring retainer.