Brake Slack Adjusters for Commercial Trucks and Trailers
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Slack Adjusters

Slack Adjusters

OEM quality manual and automatic slack adjusters for commercial trucks and trailer braking systems.

Found 107 Matching Products
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  1. Slack Adjuster
  2. Clevis Pins
  1. Clevis
  2. Slack Adjuster Service Kit
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SKU CP1
$1.22

Clevis pin CP1, 1/2 inch diameter x 1.718 Inches long with cotter key.   Details

4 In Stock as of September 26, 2021 7:11 AM EST.
  • Diameter:1/2 inch
  • Length:1.718 inch
  • Automann Number:179.CP12
  • Euclid Number:E11989, E8900
  • Meritor Number:19X1083, 19X1084, 19X45, R801732, R801773, R801774
  • MPN: CP1
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SKU CB22153
$59.95

A Crewson Brunner type automatic slack adjuster for 12-1/4 inch brake with 1.   Details

8 In Stock as of September 26, 2021 7:30 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
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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.   Details

20+ In Stock as of September 26, 2021 7:30 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
SKU CPS114
$5.95

Greasable clevis pin CPS114, 1/4 inch diameter x 1-1/4 inches long with cotter key.   Details

20+ In Stock as of September 26, 2021 7:22 AM EST.
  • Diameter:1/4 inch
  • Length:1-1/4 inch
  • MPN: CPS114
SKU SA22103
$64.42

A Crewson Brunner type automatic slack adjuster with 1.   Details

20+ In Stock as of September 26, 2021 7:30 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:136.2830
  • BWP Number:M-3368, M-3492
  • Crewson Number:MK22103S, CB22103, CB22106, CI22103, CI22106, CS56004, CB22123
  • Dayton Number:05-562
  • Euclid Number:E-6993A, E-6993, E-6993B, E-10949A
  • Haldex Number:CS52321, CS52321, CS52341
  • Leland Number:L3005, L-3161
  • Spicer Number: 11-355, 11-511, 11-515, 11-519
  • MPN: SA22103
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SKU CB22102
$59.95

Crewson type automatic slack adjuster with 1.5 camshaft diameter, 28 spline, 5.5 and 6.   Details

20+ In Stock as of September 26, 2021 7:30 AM EST.
  • Slack Adjustor Type:Automatic
  • Slack Adjustor Arm:Straight
  • Camshaft Diameter:1.50 inches
  • Spline Teeth:28
  • Arm Span (A):5.50 inches
  • Arm Span (B):6.50 inches
  • Automann Number:136.2831
  • Bendix Number:65247
  • BWP Number:M-3370
  • Crewson Number:MK22102S, CB22102, CI22102
  • Dayton Number:05-563
  • Euclid Number:E-6994A, E-11403, E-6994, E-6994B
  • Ford Number:4C4Z2041DA
  • Haldex Number:CS52320
  • Leland Number:L3006
  • Mack Number:25QD261P2
  • Meritor Number:A413275Z1144, R801070, R802462
  • Spicer Number: 11-368, 11-507, 11-508, 11-512, 11-517, 11-520
  • Note:Product may vary from image shown
  • MPN: CB22102
SKU GS6000022825
$15.50

A SORL manual slack adjuster, 1.5 inch camshaft diameter, 28 spline and 5.5 and 6.5 inch arm span.   Details

20+ In Stock as of September 26, 2021 7:30 AM EST.
  • Slack Adjustor Type:Manual
  • Slack Adjustor Arm:Straight
  • Camshaft Diameter:1.50 inches
  • Spline Teeth:28
  • Arm Span (A):5.50 inches
  • Arm Span (B):6.50 inches
  • Automann Number:134.2831
  • Bendix Number:288753
  • BWP Number:M2577
  • Dayton Number:05-237
  • Euclid Number:E2459, E2459HD
  • Meritor Number: R822004, R823003, R824004
  • Midland Number:KN44061
  • Spicer Number: 10-368, 10-368BULK, 10-368HD
  • Manufacturers Part Number:6000022825
  • MPN: 6000022825
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SKU 40010305-I
$52.95

Haldex Type Automatic Slack Adjuster for 12-1/4 inch brake assembly applications. 1.   Details

20+ In Stock as of September 26, 2021 7:02 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:135.2842, 133.2842
  • BWP Number:M-4062
  • Dayton Number:05-651
  • Euclid Number:E-6933
  • Haldex Number:40010305, 400-10305
  • Leland Number:L3614
  • Meritor Number:R806006
  • MPN: 40010305
Free Ship!
SKU CB21153
$76.95

Crewson automatic slack adjuster for 12−1/4 inch brake Low Boy application. 1.   Details

4 In Stock as of September 26, 2021 7:30 AM EST.
  • Slack Adjustor Type:Automatic
  • Slack Adjustor Arm:Offset
  • Camshaft Diameter:1.50 inches
  • Spline Teeth:10
  • Arm Span (A):5.00 inches
  • Arm Span (B):6.00 inches
  • Automann Number:136.1043
  • Crewson Number:CB21153
  • Note:Product may vary from image shown
  • MPN: CB21153
Free Ship!
SKU CB22152
$69.95

Crewson type automatic slack adjuster for 12−1/4 inch brake Low Boy application. 1.   Details

Typically ships in 2 to 3 business days.
  • Slack Adjustor Type:Automatic
  • Slack Adjustor Arm:Offset
  • Camshaft Diameter:1.50 inches
  • Spline Teeth:28
  • Arm Span (A):5.50 inches
  • Arm Span (B):6.50 inches
  • Note:Product may vary from image shown
  • MPN: CB22152
Free Ship!
SKU 065170-I
$52.95

Bendex type Automatic Slack Adjuster. 1.5 inch 10 spline, 5.5 inch arm length.   Details

5 In Stock as of September 26, 2021 7:02 AM EST.
  • Slack Adjustor Type:Automatic
  • Slack Adjustor Arm:Straight
  • Camshaft Diameter:1.50 inches
  • Spline Teeth:10
  • Arm Span (A):5.50 inches
  • Bendix Number:65170, 065170, K065170
  • Dayton Number:05-461
  • Haldex Number:CS56032
  • MPN: 065170
Free Ship!
SKU 40010013
$105.00

Haldex Automatic Slack Adjuster. 1.25 inch 10 spline, 5.   Details

Typically ships in 5 to 7 business days.
  • Slack Adjustor Type:Automatic
  • Slack Adjustor Arm:Straight
  • Camshaft Diameter:1.25 inches
  • Spline Teeth:10
  • Arm Span (A):5.50 inches
  • Eaton Number:815814
  • Haldex Number:4001001, 40910128, 40910224, 40910391, 40910495
  • Mack Number:25QD259P3
  • Meritor Number:R806009
  • Midland Number:40010001
  • Manufacturers Part Number:409-10172
  • MPN: 409-10172

Brake Adjusters

Slack adjusters (also called brake adjusters or just "slacks") regulate the distance that the air brake has to travel to apply friction to the wheel. This distance increases as use of the brake causes the friction material of the brake shoe to wear away. When the brake is used, the operating rod pushes out on the slack adjuster which then turns the S-cam. The S-cam pushes the brake shoes apart which applies friction and slows the vehicle. Without this function, the air brake can become out of adjustment and the vehicle may lose its capability to slow or stop consistently.

When you need to replace your slack adjusters, it is very important to find the correct part that matches your equipment to ensure a safely operating braking system. It's easy to find the correct replacement slack adjusters for your truck, tractor or trailer. First, the type of slack adjuster should be considered. Slack adjusters are available in two types: manual slack adjusters and automatic slack adjusters.

Manual slack adjusters compensate for the distance in the brake linkage by adjustments made with a wrench.

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

Both manual and automatic slack adjusters have three qualifications which can be easily measured. Finding these three measurements is the key to finding the correct slack adjusters.

How to Measure and Identify a Slack Adjuster

Spline Teeth

The spline teeth of a slack adjuster fit into the spline teeth of the camshaft. Therefore, the slack adjuster and camshaft must have the same amount of teeth. An easy way to determine the number of teeth is to simply count them.

Spline teeth of a slack adjuster.

Camshaft Diameter

The camshaft diameter is size of the camshaft that fits your particular slack adjuster. This can be found by measuring the inside of the socket or the width of the camshaft.

Camshaft diameter of a slack adjuster

Arm Span

The arm span of a slack adjuster is the distance between the center of the camshaft and the center of the pin hole that is used with the clevis. Many slack adjusters feature multiple pin holes. These slacks can be used at any of the lengths available. For example, a slack adjuster with an arm span of 5.0 and 6.0 inch can be used in applications where a 5 inch or 6 inch arm span is needed.

This picture illustrates the arm span of a slack adjuster.

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