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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1781 (Automatic Transmission Overhaul - 4 Speed-Mu4) >> Repair Instructions >> Underdrive Brake Removal >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

Tools Required 

  1. Use the J 7872  in order to measure the underdrive brake assembly (1) clearance.
  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 1: Measuring Underdrive Brake Assembly Clearance Using Compressed Air & J 7872
    G01384839Courtesy 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.
    Fig 2: Installing J 23327 & J 37282
    G01384840Courtesy 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.
    Fig 3: Removing Underdrive Brake Piston Return Spring Snap Ring
    G01384841Courtesy 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 4: Removing Underdrive Brake Flange, Plates & Discs
    G01384842Courtesy of GENERAL MOTORS CORP.
  9. Remove the underdrive brake piston return spring (2) from the transaxle case (1).
    Fig 5: Removing Underdrive Brake Piston Return Spring
    G01384843Courtesy of GENERAL MOTORS CORP.
  10. Remove the two seal rings (1) from the underdrive clutch drum support (2).
    Fig 6: Removing Underdrive Clutch Drum Support Seal Rings
    G01384844Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to SAFETY GLASSES CAUTION in Cautions and Notices.

    Important:  When using compressed air to remove components, air pressure should not exceed 98 kPa (14 psi).

  11. Remove the underdrive brake piston from the transaxle case by slowly applying low pressure compressed air into the underdrive brake apply passage (2).
    Fig 7: Removing Underdrive Brake Piston Using Compressed Air
    G01384845Courtesy of GENERAL MOTORS CORP.