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Slack Adjusters

Slack Adjusters

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

Found 101 Matching Products
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  1. Slack Adjuster
  2. Clevis Pins
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  1. 10
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  1. 6.50 inches
  1. 1-1/4 inch
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  1. 1.718 inch
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  1. 6.50 inches
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SKU R801042-I
$67.14

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

20+ In Stock as of September 25, 2022 14:40 PM 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 GS6000022825
$22.67

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 25, 2022 14:40 PM 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
SKU 40020212-I
$67.94

Haldex type self-securing automatic slack adjuster with 1.5 inch Camshaft Diameter, 28 Spline, 6.   Details

20+ In Stock as of September 25, 2022 14:40 PM 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.S2841
  • Haldex Number:40020212, 400-20212, 409-20006
  • MPN: 40020212-I
SKU 40020211I
$67.94

Haldex type Automatic Slack Adjuster. 1.5 inch 28 spline, 5.   Details

20+ In Stock as of September 25, 2022 14:40 PM 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 R802463-I
$67.14

Meritor Type Automatic Slack Adjuster for use on disc brakes with a type 30 brake chamber. 1.   Details

20+ In Stock as of September 25, 2022 14:40 PM 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
SKU CB22153
$67.14

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

20+ In Stock as of September 25, 2022 14:40 PM 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 CB21103
$67.02

A Crewson Brunner type automatic slack adjuster with 1.   Details

20+ In Stock as of September 25, 2022 14:40 PM EST.
  • Slack Adjustor Type:Automatic
  • Slack Adjustor Arm:Straight
  • Camshaft Diameter:1.50 inches
  • Spline Teeth:10
  • Arm Span (A):5.00 inches
  • Arm Span (B):6.00 inches
  • Automann Number:36.1030
  • BWP Number:M-3367
  • Crewson Number:MK21103S, CB21103, CI21103
  • Dayton Number:05-560
  • Euclid Number:E-6991A, E-6991, E-6991B
  • Haldex Number:CS52315
  • Leland Number:L3003
  • Spicer Number: 11-351, 11-351-101, 11-513, 11-516, 11-521
  • Note:Product may vary from image shown
  • MPN: CB21103
SKU GS6020013715
$25.88

A SORL manual slack adjuster, 1.6 inch camshaft diameter, 37 spline teeth and 6 inch arm span.   Details

20+ In Stock as of September 25, 2022 14:40 PM EST.
  • Slack Adjustor Type:Manual
  • Slack Adjustor Arm:Straight
  • Camshaft Diameter:1.60 inches
  • Spline Teeth:37
  • Arm Span (A):6.00 inches
  • Bendix Number:283411
  • BWP Number:M474
  • Euclid Number:E1574, E1574HD
  • Meritor Number:R823008, R824007
  • Midland Number:KN44041
  • Manufacturers Part Number:6020013715
  • MPN: 6020013715
SKU 05-579
$2.58

Clevis pin kit 05-579. Includes 1/2 and 1/4 inch pins with cotter key and washer. 1-5/8 inches long.   Details

20+ In Stock as of September 25, 2022 14:40 PM EST.
  • Diameter:1/2 inch - 1/4 inch
  • Length:1-3/4 inch - 1-9/16 inch
  • Automann Number:179.CPK
  • Crewson Number:8056KT
  • MPN: 05-579
SKU CB22123
$82.50

Crewson type automatic slack adjuster with 1.   Details

Typically ships in 3 to 4 business days.
  • 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
  • Crewson Number:CB22153
  • Dayton Number:05-552
  • Note:Product may vary from image shown
  • MPN: CB22123
SKU CF2
$4.95

Clevis kit, 5/8 inch-18 threads, 1/2 inch offset. Includes 1/2 inch pin. Replaces 179.   Details

20+ In Stock as of September 25, 2022 14:40 PM EST.
  • Automann Number:179.YK5812
  • Bendix Number:228790, 228790N
  • Euclid Number:E8897
  • Haldex Number:CF2, 19105
  • International Number:136959R1
  • Mack Number:745228790
  • Meritor Number:1245C185
  • Midland Number:KN36470
  • Spicer Number: 1-131
  • MPN: CF2
SKU CF3
$5.95

Clevis kit, 5/8 inch-18 threads, includes 5/8 inch pin, gold color. For Peterbilt 379 applications.   Details

12 In Stock as of September 25, 2022 2:40 PM EST.
  • Automann Number:179.YK5813
  • Bendix Number:228798, 228798N
  • BWP Number:M-1383
  • Dayton Number:12-40204
  • Euclid Number:E8898
  • Haldex Number:CF3, KN36480
  • Leland Number:T1004
  • Meritor Number:1245D186
  • Midland Number:KN36480
  • Spicer Number: 1130, 14508
  • Tectran Number:2010-1010
  • Velvac Number:019017
  • Wagner Number:926307, A21351
  • Westar Number:85-22010
  • UPC: 889626043512
  • MPN: CF3

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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