Chassis
 
  5-Spoke Wheel and
  Brake Drum
  Rim and Wheel(Rim &
  Disc Wheel)
  Hub and Brake Drum
  Axle
  Auto Slack Aduster
  Suspension
    Air Ride
    Mechanical
  King Pin
   
 
  Auto Slack Aduster
 
JB Enterprises, Inc. offers a wide range of Crewson Automatic Brake Adjusters to meet whatever needs you may have. Crewson ABA's provide better axle and suspension configuration and are equipped with an adjusting mechanism, allowing customers for easy installation and brake lining wear inspection.
Highway Duty | Straight Arm
Heavy-duty internal components with a clearance-sensing clutch that enables your brake system to adjust for hot braking conditions.
JB Enterprises, Inc. offers Crewson ABA's "Cam-Guard" which lets you keep the S-Cam spline fully lubricated when you grease the ABA.
This specially designed spline gear has a groove in the center that allows grease to flow to the S-Cam spline, promoting longer life for the spline and the ABA. All aftermarket kits come with a plastic hands-free installation template, clevis and clevis pin kits.
 
Part Number Spline Size Clevis Type Arm Length
CI 21102 1 1/2 - 10 5/8 - 18 Straight 5.5" - 6.5"
CI 21103 1 1/2 - 10 5/8 - 18 Straight 5", 6"
CI 22102 1 1/2 - 28 5/8 - 18 Straight 5.5" - 6.5"
CI 22103 1 1/2 - 28 5/8 - 18 Straight 5", 6"
CI 23102 1 5/8 - 37 5/8 - 18 Straight 5.5" - 6.5"
CI 23103 1 5/8 - 37 5/8 - 18 Straight 5", 6"
CI 24102 1 1/4 - 10 5/8 - 18 Straight 5.5" - 6.5"
CI 24103 1 1/4 - 10 5/8 - 18 Straight 5", 6"
CI 25102 1 1/4 - 24 5/8 - 18 Straight 5.5" - 6.5"
CI 25103 1 1/4 - 24 5/8 - 18 Straight 5", 6"
 
Highway Duty | Curved Arm
Heavy-duty internal components with a clearance-sensing clutch that enables your brake system to adjust for hot braking conditions.
JB Enterprises, Inc. offers Crewson ABA's "Cam-Guard" which lets you keep the S-Cam spline fully lubricated when you grease the ABA.
This specially designed spline gear has a groove in the center that allows grease to flow to the S-Cam spline, promoting longer life for the spline and the ABA. All aftermarket kits come with a plastic hands-free installation template, clevis and clevis pin kits.
 
Part Number Spline Size Clevis Type Arm Length
CI 21152 1 1/2 - 10 5/8 - 18 Straight 5.5" - 6.5"
CI 21153 1 1/2 - 10 5/8 - 18 Straight 5", 6"
CI 22152 1 1/2 - 28 5/8 - 18 Straight 5.5" - 6.5"
CI 22153 1 1/2 - 28 5/8 - 18 Straight 5", 6"
CI 23152 1 5/8 - 37 5/8 - 18 Straight 5.5" - 6.5"
CI 23153 1 5/8 - 37 5/8 - 18 Straight 5", 6"
 
Highway Duty | Straight Arm with Auto-Check
Heavy-duty internal components with a clearance-sensing clutch that enables your brake system to adjust for hot braking conditions.
JB Enterprises, Inc. offers Crewson ABA's "Cam-Guard" which lets you keep the S-Cam spline fully lubricated when you grease the ABA.
This specially designed spline gear has a groove in the center that allows grease to flow to the S-Cam spline, promoting longer life for the spline and the ABA. All aftermarket kits come with a plastic hands-free installation template, clevis and clevis pin kits.

Crewson Industries patented "AUTO-CHECK" stroke indicator is permanently mounted to the ABA. It shows both the correct setup angle and air chamber stroke without crawling under the vehicle. The ABA is correctly setup when the "AUTO-CHECK" stroke indicator points to the "HOME" position labeled on the ABA. It is also very simple to determine whether or not the ABA is operating properly by visually inspecting the movement of the "AUTO-CHECK" pointer. The air chamber stroke is within specified limits, and the ABA is operating properly as long as the stroke stays within the green area on the indicator. When the pointer strokes into the red area on the indicator, the ABA is out of adjustment and must be replaced.
 
Part Number Chamber Type Spline Size Clevis Type Arm Length
CI 34100 T-16,20,24 Standard Stroke Chamber 1 1/4 - 10 5/8 - 18 Straight 5.5"
CI 34200 T-16,20,24 Standard Stroke Chamber 1 1/4 - 10 1/2 - 20 Straight 5.5"
CI 35100 T-16,20,24 Standard Stroke Chamber 1 1/4 - 24 5/8 - 18 Straight 5.5"
CI 35200 T-16,20,24 Standard Stroke Chamber 1 1/4 - 24 1/2 - 20 Straight 5.5"
CI 41100 T-30 Standard Stroke Chamber 1 1/2 - 10 5/8 - 18 Straight 5.5"
CI 41106 T-30 Standard Stroke Chamber 1 1/2 - 10 5/8 - 18 Straight 6"
CI 42100 T-30 Standard Stroke Chamber 1 1/2 - 28 5/8 - 18 Straight 5.5"
CI 42106 T-30 Standard Stroke Chamber 1 1/2 - 28 5/8 - 18 Straight 6"
CI 43100 T-30 Standard Stroke Chamber 1 5/8 - 37 5/8 - 18 Straight 5.5"
CI 43106 T-30 Standard Stroke Chamber 1 5/8 - 37 5/8 - 18 Straight 6"
CI 71100 T-24,30 Long Stroke Chamber 1 1/2 - 10 5/8 - 18 Straight 5.5"
CI 71106 T-24,30 Long Stroke Chamber 1 1/2 - 10 5/8 - 18 Straight 6"
CI 72100 T-24,30 Long Stroke Chamber 1 1/2 - 28 5/8 - 18 Straight 5.5"
CI 72106 T-24,30 Long Stroke Chamber 1 1/2 - 28 5/8 - 18 Straight 6"
CI 73106 T-24,30 Long Stroke Chamber 1 5/8 - 37 5/8 - 18 Straight 6"
 
Transit Duty | Straight Arm
Heavy-duty internal components with a clearance-sensing clutch that enables your brake system to adjust for hot braking conditions.
JB Enterprises, Inc. offers Crewson ABA's "Cam-Guard" which lets you keep the S-Cam spline fully lubricated when you grease the ABA.
This specially designed spline gear has a groove in the center that allows grease to flow to the S-Cam spline, promoting longer life for the spline and the ABA. All aftermarket kits come with a plastic hands-free installation template, clevis and clevis pin kits.
 
Part Number Spline Size Clevis Type Arm Length
CI 211K2 1 1/2 - 10 5/8 - 18 Straight 5.5" - 6.5"
CI 211K3 1 1/2 - 10 5/8 - 18 Straight 5", 6"
CI 221K2 1 1/2 - 28 5/8 - 18 Straight 5.5" - 6.5"
CI 221K3 1 1/2 - 28 5/8 - 18 Straight 5", 6"
 
Transit Duty | Offset Arm
Heavy-duty internal components with a clearance-sensing clutch that enables your brake system to adjust for hot braking conditions.
JB Enterprises, Inc. offers Crewson ABA's "Cam-Guard" which lets you keep the S-Cam spline fully lubricated when you grease the ABA.
This specially designed spline gear has a groove in the center that allows grease to flow to the S-Cam spline, promoting longer life for the spline and the ABA.
All Aftermarket kits come with a plastic hands-free installation template, clevis and clevis pin kits.
When selecting a 1 1/2 inch Offset ABA, it is required to specify Left Hand or Right Hand. Left and right-hand are based upon the direction of offset. As shown in the diagram to the right, with the hex adjusting shaft and/or grease fitting facing you, a right-handed offset is required if the chamber push rod is offset to the right. The left-handed offset would then be required when the chamber push rod is offset to the left.
 
Part Number Spline Size Clevis Type Arm Length
CI 211S2 LH 1 1/2 - 10 5/8 - 18 Straight 5.5" - 6.5"
CI 211S2 RH 1 1/2 - 10 5/8 - 18 Straight 5.5" - 6.5"
CI 211S4 LH 1 1/2 - 10 5/8 - 18 Straight 6", 7"
CI 211S4 RH 1 1/2 - 10 5/8 - 18 Straight 6", 7"
CI 221S2 LH 1 1/2 - 28 5/8 - 18 Straight 5.5" - 6.5"
CI 221S2 RH 1 1/2 - 28 5/8 - 18 Straight 5.5" - 6.5"
CI 221S4 LH 1 1/2 - 28 5/8 - 18 Straight 6", 7"
CI 221S4 RH 1 1/2 - 28 5/8 - 18 Straight 6", 7"
 
Transit Duty | Curved Arm
Heavy-duty internal components with a clearance-sensing clutch that enables your brake system to adjust for hot braking conditions.
JB Enterprises, Inc. offers Crewson ABA's "Cam-Guard" which lets you keep the S-Cam spline fully lubricated when you grease the ABA. This specially designed spline gear has a groove in the center that allows grease to flow to the S-Cam spline, promoting longer life for the spline and the ABA. All Aftermarket kits come with a plastic hands-free installation template, clevis and clevis pin kits.
 
Part Number Spline Size Clevis Type Arm Length
CI 211J2 1 1/2 - 10 5/8 - 18 Straight 5.5" - 6.5"
CI 211J3 1 1/2 - 10 5/8 - 18 Straight 5", 6"
CI 221J2 1 1/2 - 28 5/8 - 18 Straight 5.5" - 6.5"
CI 221J3 1 1/2 - 28 5/8 - 18 Straight 5", 6"
 
Severe Duty | Straight Arm
Heavy-duty internal components with a clearance-sensing clutch that enables your brake system to adjust for hot braking conditions.
JB Enterprises, Inc. offers Crewson ABA's "Cam-Guard" which lets you keep the S-Cam spline fully lubricated when you grease the ABA. This specially designed spline gear has a groove in the center that allows grease to flow to the S-Cam spline, promoting longer life for the spline and the ABA. All Aftermarket kits come with a plastic hands-free installation template, clevis and clevis pin kits.
 
Part Number Spline Size Clevis Type Arm Length
CI 211A2 1 1/2 - 10 5/8 - 18 Straight 5.5" - 6.5"
CI 211A3 1 1/2 - 10 5/8 - 18 Straight 5", 6"
CI 221A2 1 1/2 - 28 5/8 - 18 Straight 5.5" - 6.5"
CI 221A3 1 1/2 - 28 5/8 - 18 Straight 5", 6"
CI 231A2 1 5/8 - 37 5/8 - 18 Straight 5.5" - 6.5"
CI 231A3 1 5/8 - 37 5/8 - 18 Straight 5", 6"
 
Severe Duty | Offset Arm
Heavy-duty internal components with a clearance-sensing clutch that enables your brake system to adjust for hot braking conditions.
JB Enterprises, Inc. offers Crewson ABA's "Cam-Guard" which lets you keep the S-Cam spline fully lubricated when you grease the ABA. This specially designed spline gear has a groove in the center that allows grease to flow to the S-Cam spline, promoting longer life for the spline and the ABA.
All Aftermarket kits come with a plastic hands-free installation template, clevis and clevis pin kits.
When selecting a 1 1/2 inch Offset ABA, it is required to specify Left Hand or Right Hand. Left and right-hand are based upon the direction of offset. As shown in the diagram to the right, with the hex adjusting shaft and/or grease fitting facing you, a right-handed offset is required if the chamber push rod is offset to the right. The left-handed offset would then be required when the chamber push rod is offset to the left.
 
Part Number Spline Size Clevis Type Arm Length
CI 211E2 LH 1 1/2 - 10 5/8 - 18 Straight 5.5" - 6.5"
CI 211E2 RH 1 1/2 - 10 5/8 - 18 Straight 5.5" - 6.5"
CI 211E4 LH 1 1/2 - 10 5/8 - 18 Straight 6", 7"
CI 211E4 RH 1 1/2 - 10 5/8 - 18 Straight 6", 7"
CI 221E2 LH 1 1/2 - 28 5/8 - 18 Straight 5.5" - 6.5"
CI 221E2 RH 1 1/2 - 28 5/8 - 18 Straight 5.5" - 6.5"
CI 221E4 LH 1 1/2 - 28 5/8 - 18 Straight 6", 7"
CI 221E4 RH 1 1/2 - 28 5/8 - 18 Straight 6", 7"
 
Severe Duty | Straight Arm with Auto-Check
Heavy-duty internal components with a clearance-sensing clutch that enables your brake system to adjust for hot braking conditions.
JB Enterprises, Inc. offers Crewson ABA's "Cam-Guard" which lets you keep the S-Cam spline fully lubricated when you grease the ABA. This specially designed spline gear has a groove in the center that allows grease to flow to the S-Cam spline, promoting longer life for the spline and the ABA. All Aftermarket kits come with a plastic hands-free installation template, clevis and clevis pin kits.

Crewson Industries patented "AUTO-CHECK" stroke indicator is permanently mounted to the ABA. It shows both the correct setup angle and air chamber stroke without crawling under the vehicle. The ABA is correctly setup when the "AUTO-CHECK" stroke indicator points to the "HOME" position labeled on the ABA. It is also very simple to determine whether or not the ABA is operating properly by visually inspecting the movement of the "AUTO-CHECK" pointer. The air chamber stroke is within specified limits, and the ABA is operating properly as long as the stroke stays within the green area on the indicator. When the pointer strokes into the red area on the indicator, the ABA is out of adjustment and must be replaced.
 
Part Number Chamber Type Spline Size Clevis Type Arm Length
CI 411A0 T-30 Standard Stroke Chamber 1 1/2 - 10 5/8 - 18 Straight 5.5"
CI 411A6 T-30 Standard Stroke Chamber 1 1/2 - 10 5/8 - 18 Straight 6"
CI 421A0 T-30 Standard Stroke Chamber 1 1/2 - 28 5/8 - 18 Straight 5.5"
CI 421A6 T-30 Standard Stroke Chamber 1 1/2 - 28 5/8 - 18 Straight 6"
CI 431A0 T-30 Standard Stroke Chamber 1 5/8 - 37 5/8 - 18 Straight 5.5"
CI 431A6 T-30 Standard Stroke Chamber 1 5/8 - 37 5/8 - 18 Straight 6"
 
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