AT-72 AUTOMATIC TRANSMISSION — Component Groups (Center Support Assembly) (e) Hold the brake hub in a vise with soft jaws, and flatten the ears with a chisel. (f) Check to make sure that the retainer is centered. 3. INSPECT DISC, PLATE AND FLANGE Check that the sliding surface of disc is not worn or burnt. If the disc is worn or burnt, replace all discs. Then check that the sliding surfaces of plate and flange are not worn or burnt. If necessary, replace them. NOTE: Do allow the discs to dry out. Prepare new discs by soaking them at least two hours in ATF. ASSEMBLY OF CENTER SUPPORT ASSEMBLY (See page AT-89) 1. INSTALL TWO OIL SEAL RINGS AND ONE WAY CLUTCH ASSEMBLY ON SUN GEAR 2. INSTALL THREE OIL SEAL RINGS ON CENTER SUPPORT Spread the rings apart and slip them into the groove. Hook both ends by hand. 3. INSTALL NEW O-RINGS ON PISTON 4. INSTALL NO. 1 BRAKE PISTON IN CENTER SUPPORT Press the No. 1 brake piston into the center support with the cup side up, being careful not to damage the O-rings.