Second Brake

Second Brake Components AW-4 Automatic Transmission:

DISASSEMBLY

Removing/Installing Second Brake Assembly:

1. Remove second brake drum from output shaft.

Removing/Installing Second Brake Drum Thrust Washer:

2. Remove thrust washer from second brake drum.

Removing/Installing Second Brake Piston Snap Ring:

3. Compress piston return springs with shop press and tool 7538. Then remove piston snap ring.
4. Remove compressor tool and remove spring retainer and return springs.

Removing/Installing Piston And Sleeve:

5. Remove second brake piston and sleeve from drum with compressed air. Use only enough air pressure to ease piston out of drum.
6. Remove and discard brake piston O-rings.

Measuring Second Brake Piston Return Springs:

7. Measure free length of piston return springs with springs mounted in retainer. Length should be approximately 16.05 mm (0.632 inch). Replace return springs if length is less than specified.

ASSEMBLY
1. Lubricate and install new O-rings on brake piston. Then install brake piston in drum.
2. Install return springs and retainer on brake piston.
3. Compress return springs with shop press and Compressor Tool 7538. Install piston snap ring and remove brake assembly from press.

Checking Second Brake Piston Operation:

4. Check brake piston operation with low pressure compressed air. Apply air pressure through feed hole in drum. Piston should move smoothly when applying-releasing air pressure.

Installing Second Brake Thrust Washer:

5. Coat thrust washer with petroleum jelly and install it in drum. Be sure washer notches are aligned with tabs on spring retainer.