Overdrive Support Brake


Remove all thrust washers from overdrive support. Using appropriate compressor, compress piston return spring and remove snap ring. Place support on direct clutch assembly. Hold brake piston in a level position. Carefully apply air pressure to piston supply port and remove piston. Remove oil seal rings from rear of support. See Fig. 39.


Clean all components with solvent. Dry with compressed air. Inspect components for damage. Measure return spring free length. Free length should be .702" (17.82 mm). Replace components as necessary.


1. To reassemble, reverse disassembly procedure. Coat seal rings with ATF prior to installation. DO NOT over expand seal rings during piston installation. Ensure seal rings move smoothly after installation.

2. Install NEW "O" rings on OD brake piston. Use care not to damage "O" rings during piston installation. Install snap ring in support and ensure end of snap ring is not aligned with cutout portion of support.

3. Ensure tabs on all races are aligned with areas on support. Coat races and thrust bearings with petroleum jelly prior to installation. Place support on direct clutch assembly and apply air pressure to piston supply port. Ensure piston operates smoothly in support. See Fig. 39.

Fig. 38: Checking Forward Clutch Piston Stroke Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2001-05 AUTOMATIC TRANSMISSIONS A340E & A340F Overhaul

Fig. 39: Exploded View Of Overdrive Support & Brake Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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  • rita
    Where is a overdrive snap ring highlander?
    8 years ago
  • thomas erickson
    How to fix overdrive in toyota sequioa?
    8 years ago

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