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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 >> Second Coast Brake Removal

Second Coast Brake Removal

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.
  1. Remove the 1 bolt and the second coast brake apply pipe bracket (2) from the transaxle case (1).
    Fig 1: Removing Second Coast Brake Apply Pipe Bracket & Bolt
    G01384794Courtesy of GENERAL MOTORS CORP.
  2. Remove the 2nd coast brake apply pipe (1) from the transaxle case (2).
    Fig 2: Removing Second Coast Brake Apply Pipe
    G01384795Courtesy of GENERAL MOTORS CORP.
  3. Place a reference mark (1) on the 2nd coast brake piston rod (2) where the piston rod meets the transaxle case.
    Fig 3: Applying Reference Mark On 2nd Coast Brake Piston Rod
    G01384796Courtesy of GENERAL MOTORS CORP.
  4. Apply 392-785 kPa (57-114 psi) of compressed air into the 2nd coast brake apply passage (2).
  5. Measure the distance between the reference mark and the transaxle case using a feeler gage (1) to obtain the 2nd coast brake piston stroke.
    • The 2nd coast brake piston stroke should fall within 1.5-3.5 mm (0.059-0.138 in) (3)
    • If the 2nd coast brake piston stroke exceeds specification, inspect the 2nd coast brake band for excessive wear or damage
    Fig 4: Checking 2nd Coast Brake Piston Stroke Using Compressed Air
    G01384797Courtesy of GENERAL MOTORS CORP.
  6. Remove the 2nd coast brake servo cover snap ring (1) from the transaxle case.
    Fig 5: Removing 2nd Coast Brake Servo Cover Snap Ring
    G01384798Courtesy of GENERAL MOTORS CORP.

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

  7. Remove the following components from the transaxle case (2) by slowly applying low pressure compressed air into the 2nd coast brake servo apply passage (1):
    • The 2nd coast brake servo cover
    • The 2nd coast brake piston
    • The 2nd coast brake piston outer return spring
    Fig 6: Removing 2nd Coast Brake Piston, Return Spring & Servo Cover
    G01384799Courtesy of GENERAL MOTORS CORP.
  8. Remove the forward and direct clutch assemblies (3, 2) from the transxle case by grasping the input shaft (1) and lifting the shaft upward.
    Fig 7: Removing Forward & Direct Clutch Assemblies
    G01384800Courtesy of GENERAL MOTORS CORP.
  9. Remove the 2nd coast brake band anchor pin (2) from the transaxle case (1).
    Fig 8: Removing 2nd Coast Brake Band Anchor Pin
    G01384801Courtesy of GENERAL MOTORS CORP.
  10. Remove the 2nd coast brake band from the transaxle case (1).
    Fig 9: Removing 2nd Coast Brake Band
    G01384802Courtesy of GENERAL MOTORS CORP.
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