Underdrive Brake Removal

Tools Required

• J 7872  Magnetic Base Indicator Set. See Special Tools .
• J 23327  Clutch Spring Compressor
• J 37282  Underdrive Brake Piston Compressor. See Special Tools .

Fig 1: Blowing Air In Underdrive Brake Apply Passage
Courtesy of GENERAL MOTORS CORP.
1. Use the J 7872  in order to measure the underdrive brake assembly (1) clearance. See Special Tools .
2. Apply 392-785 kPa (57-114 psi) of compressed air into the underdrive brake apply passage (2). Measure the underdrive brake assembly clearance.
3. The underdrive brake assembly clearance should fall within 1.070-2.050 mm (0.0421-0.0807 in).
4. If the underdrive brake assembly clearance does not fall within specification, inspect the underdrive brake assembly components for excessive wear or damage.
Fig 2: Installing & Removing J 23327 & J 37282
Courtesy of GENERAL MOTORS CORP.
5. Install a J 23327  with a J 37282  and compress the underdrive brake piston return spring until the underdrive brake piston return spring snap ring (1) can be removed. See Special Tools .
Fig 3: Using J 23327 & J 37282 To Remove Underdrive Brake Piston Return Spring Snap Ring
Courtesy of GENERAL MOTORS CORP.
6. Remove the underdrive brake piston return spring snap ring (1) from the transaxle case.
7. Remove the J 23327  and the J 37282  from the transaxle case. See Special Tools .
Fig 4: Identifying Underdrive Brake Flange, Plates & Discs
Courtesy of GENERAL MOTORS CORP.
8. Remove the underdrive brake flange (2), the three plates (1) and the three discs (3) from the transaxle case.
Fig 5: Locating Underdrive Brake Piston Return Spring
Courtesy of GENERAL MOTORS CORP.
9. Remove the underdrive brake piston return spring (2) from the transaxle case (1).
Fig 6: View Of Underdrive Clutch Drum Support Seal Rings
Courtesy of GENERAL MOTORS CORP.
10. Remove the two seal rings (1) from the underdrive clutch drum support (2).
CAUTION: Wear safety glasses in order to avoid eye damage.
IMPORTANT: When using compressed air to remove components, air pressure should not exceed 98 kPa (14 psi).
Fig 7: Blowing Air In Underdrive Brake Apply Passage
Courtesy of GENERAL MOTORS CORP.
11. Remove the underdrive brake piston from the transaxle case by slowly applying low pressure compressed air into the underdrive brake apply passage (2).