Automatic Slack Adjusters

Automatic slack adjusters remove the slack in the brake linkage without the need for manual adjustment.

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  1. Slack Adjuster
  1. Clevis
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  1. 37
  1. 1.25 inches
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  1. 5.00 inches
  1. 5.50 inches
  1. 6.00 inches
  1. 6.50 inches
  1. 1.19 inch
  1. 6.00 inches
  1. 6.50 inches
  1. Haldex
  1. Multiple Heavy Duty Manufacturers
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SKU R801700-I
$12.95

Automatic slack adjuster guide pawl kit for All Meritor ASAs. Rockwell number R801700 , A1-2297-M-6461. Replaces A1-1199-S-3737, A-2297-E-5439.   Details

20+ In Stock as of September 28, 2020 9:18 AM EST.
  • Slack Adjustor Type:Automatic
  • Automann Number:139.1700
  • Euclid Number:E11432
  • Meritor Number:R801700
  • Cross References:480 MTRR801700, 705 A12297M6461, 785 R801700, COK R801700, FRL 42005531 FRL 42013622
  • MPN: R801700-I
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SKU R801041-I
$52.95

Meritor Type ABA Automatic Slack Adjuster R801041. 1.5 inch-10, 5.5 inch arm length, Unhanded. Includes clevis kit.   Details

20+ In Stock as of September 28, 2020 9:18 AM EST.
  • Slack Adjustor Type:Automatic
  • Slack Adjustor Arm:Straight
  • Camshaft Diameter:1.50 inches
  • Spline Teeth:10
  • Arm Span (A):5.50 inches
  • Automann Number:139.1031
  • BWP Number:M-4043
  • Dayton Number:05-361
  • Euclid Number:E-11398
  • Meritor Number:A163275H1152S, R801041, R803195
  • MPN: R801041
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SKU R801074-I
$59.95

Meritor Type Automatic Slack Adjuster for use on drum brakes with a type 30 brake chamber. 1.5 inch 28 spline, 6.0 inch arm length. 18 clevis thread.   Details

20+ In Stock as of September 28, 2020 9:18 AM EST.
  • Slack Adjustor Type:Automatic
  • Slack Adjustor Arm:Straight
  • Camshaft Diameter:1.50 inches
  • Spline Teeth:28
  • Arm Span (A):6.00 inches
  • Automann Number:139.2830
  • Meritor Number:A143275J1154S, R801074, R803112
  • MPN: R801074-I
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SKU 40020211I
$53.95

Haldex type Automatic Slack Adjuster. 1.5 inch 28 spline, 5.5 inch arm length, 1/2 inch arm hole diameter. Plate and Flat stud style anchor bracket.   Details

20+ In Stock as of September 28, 2020 9:18 AM EST.
  • Slack Adjustor Type:Automatic
  • Slack Adjustor Arm:Straight
  • Camshaft Diameter:1.50 inches
  • Spline Teeth:28
  • Arm Span (A):5.50 inches
  • Automann Number:135.S2840
  • Haldex Number:40020211
  • Manufacturers Part Number:409-20002
  • Note:Product may vary from image shown.
  • MPN: 409-20002
SKU AS3000-I
$7.95

Automatic Slack Adjuster Clevis Kit AS3000 for Gunite ABA Type 5/8 inch-18 thread. C/L TO C/L is 1 inch.   Details

20+ In Stock as of September 28, 2020 8:58 AM EST.
  • Slack Adjustor Type:Automatic
  • Automann Number:179.YK5814
  • Dayton Number:05-590
  • Euclid Number:E-15061
  • Gunite Number:AS3000
  • MPN: AS3000-I
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SKU R801042-I
$52.95

Meritor Type ABA Automatic Slack Adjuster R801041. 1.5 inch-10, 6.0 inch arm length, Unhanded. Includes clevis kit.   Details

20+ In Stock as of September 28, 2020 9:18 AM EST.
  • Slack Adjustor Type:Automatic
  • Slack Adjustor Arm:Straight
  • Camshaft Diameter:1.50 inches
  • Spline Teeth:10
  • Arm Span (A):6.00 inches
  • Automann Number:139.1030
  • BWP Number:M-4044
  • Dayton Number:05-360
  • Euclid Number:E-11399
  • Meritor Number:A43275J1154S, R801042, R803106
  • MPN: R801042
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SKU R802463-I
$59.95

Meritor Type Automatic Slack Adjuster for use on disc brakes with a type 30 brake chamber. 1.5 inch 28 spline, 5.5 inch arm length. 18 clevis thread.   Details

20+ In Stock as of September 28, 2020 9:18 AM EST.
  • Slack Adjustor Type:Automatic
  • Slack Adjustor Arm:Straight
  • Camshaft Diameter:1.50 inches
  • Spline Teeth:28
  • Arm Span (A):5.50 inches
  • Automann Number:139.2835
  • Meritor Number:A443275Z1144, A44-3275-Z-1144, R802463, R803050
  • Cross References:E11420, 05563, TDAR802463, NAADB, CS56040, 1694309C91, ATIR802463, A293275U593, A433275Z1144S, A573275U593S, A703275Z1144S, R802460, 764015073, TDAR802463, R802463
  • MPN: R802463-I
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SKU 40010140
$105.00

Haldex Automatic Slack Adjuster. 1.5 inch 28 spline, 5 and 6 inch arm length, 5/8 inch arm hole diameter. 35° body angle. Strap style anchor bracket.   Details

2 In Stock as of September 28, 2020 9:18 AM EST.
  • Slack Adjustor Type:Automatic
  • Slack Adjustor Arm:Straight
  • Camshaft Diameter:1.50 inches
  • Spline Teeth:28
  • Arm Span (A):5.00 inches
  • Arm Span (B):6.00 inches
  • Automann Number:133.2830
  • Haldex Number:40010142
  • Meritor Number:R806023
  • Manufacturers Part Number:409-10742
  • MPN: 409-10742
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SKU 40050003
$112.95

Haldex Automatic Slack Adjuster. 1.5 inch 28 spline, 6.5 inch arm length, 5/8 inch arm hole diameter. 34° body angle. Strap style anchor bracket.   Details

Availability: Typically ships in 5 to 7 business days.
  • Slack Adjustor Type:Automatic
  • Slack Adjustor Arm:Straight
  • Camshaft Diameter:1.50 inches
  • Spline Teeth:28
  • Arm Span (A):6.50 inches
  • Manufacturers Part Number:409-50145
  • MPN: 409-50145
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SKU AS1141-I
$52.95

Gunite type automatic slack adjuster with 1.5 inch camshaft diameter, 28 spline, 6.0 inch arm span.   Details

6 In Stock as of September 28, 2020 8:56 AM EST.
  • Slack Adjustor Type:Automatic
  • Slack Adjustor Arm:Straight
  • Camshaft Diameter:1.50 inches
  • Spline Teeth:28
  • Arm Span (A):6.00 inches
  • Automann Number:138.2830
  • Dayton Number:05-762
  • Gunite Number:AS1041, AS1141, SA10203
  • Mack Number:25QD51P3
  • Midland Number:CS56041
  • Volvo Number:8084132
  • MPN: AS1141
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SKU CB22153
$59.95

A Crewson Brunner type automatic slack adjuster for 12-1/4 inch brake with 1.5 inch camshaft diameter, 28 spline, 5 and 6 inch arm span.   Details

20+ In Stock as of September 28, 2020 9:18 AM EST.
  • Slack Adjustor Type:Automatic
  • Slack Adjustor Arm:Offset
  • Camshaft Diameter:1.50 inches
  • Spline Teeth:28
  • Arm Span (A):5.00 inches
  • Arm Span (B):6.00 inches
  • Automann Number:136.2843
  • BWP Number:M-3492
  • Crewson Number:CB22153, CB22123, CI22123, CI22153
  • Dayton Number:05-552
  • Euclid Number:E-10949A, E-10949, E-10949B
  • Haldex Number:CS52341
  • Leland Number:L-3161, L3161
  • MPN: CB22153-I
SKU SA21102
$64.42

A Crewson Brunner type automatic slack adjuster with 1.5 inch Camshaft Diameter, 10 Spline, 5.5 inch & 6.5 inch Arm Span.   Details

7 In Stock as of September 28, 2020 9:18 AM EST.
  • Slack Adjustor Type:Automatic
  • Slack Adjustor Arm:Straight
  • Camshaft Diameter:1.50 inches
  • Spline Teeth:10
  • Arm Span (A):5.50 inches
  • Arm Span (B):6.50 inches
  • Automann Number:136.1031
  • BWP Number:M-3369
  • Crewson Number:MK21102S
  • Dayton Number:05-561
  • Euclid Number:E-6992A
  • Gaumers Number:AS1132, AS1019, AS1032
  • Haldex Number:CS52316
  • Leland Number:L3004
  • Spicer Number: 11-354, 11-506, 11-514, 11-522
  • MPN: SA21102

Automatic Brake Adjusters

An automatic slack adjuster (also called a brake adjuster) is a mechanical component in the air brake system. This component adjusts the brakes automatically, as needed, while the vehicle is in operation. These adjustments are necessary to compensate for the wear in the brake shoes that is caused by the normal operation of the braking system.

According to Federal Motor Vehicle Safety Standard No. 121, if a vehicle is equipped with an air brake system was manufactured after October 20, 1994 it must be equipped with an automatic slack adjuster. Vehicles manufactured before this date may use a manual slack adjuster.

Automatic Slack Adjuster

According to this notice, issued by the National Institute for Occupational Safety and Health: Manually adjusting an automatic slack adjuster can contribute to the unexpected failure of the braking system.



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