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Slack Adjusters

Slack Adjusters

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

Found 94 Matching Products
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  1. Slack Adjuster
  2. Clevis Pins
  1. Clevis
  2. Slack Adjuster Service Kit
  1. Automatic
  1. Manual
  1. Offset
  1. Straight
  1. 10
  1. 24
  1. 28
  1. 37
  1. 48
  1. 1.25 inches
  1. 1.50 inches
  1. 1.60 inches
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  1. 1/4 inch
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  1. 1/2 inch - 1/4 inch
  1. 5/8 inch
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  1. 5.00 inches
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  1. 6.00 inches
  1. 6.50 inches
  1. 1-1/4 inch
  1. 1-3/8 inch
  1. 1-3/4 Inch
  1. 1-3/4 inch - 1-9/16 inch
  1. 1.718 inch
  1. 5.00 inches
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  1. 6.00 inches
  1. 6.50 inches
  1. 6.00 inches
  1. 7.00 inches
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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 June 25, 2022 10:05 AM 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 AS1141-I
$65.75

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

14 In Stock as of June 25, 2022 10:05 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
SKU R801041-I
$67.14

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

20+ In Stock as of June 25, 2022 10:05 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
SKU 40010305-I
$67.94

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

Typically ships in 7 to 10 business days.
  • 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
SKU 40010143-I
$67.94

Haldex Type Automatic Slack Adjuster. 1.5 inch 10 spline, 5.5 and 6.   Details

5 In Stock as of June 25, 2022 10:05 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:135.1031, 133.1031, 135.1045
  • BWP Number:M-4058
  • Dayton Number:05-661
  • Euclid Number:E-6924B
  • Haldex Number:40010121, 40010143, 400-10143, 409-10733, 40910733, 409-10813, 40910813
  • Leland Number:L3607
  • Meritor Number:R806022
  • Spicer Number: 818552
  • MPN: 40010143
SKU R801700-I
$12.95

Automatic slack adjuster guide pawl kit for All Meritor ASAs.   Details

20+ In Stock as of June 25, 2022 10:05 AM EST.
  • Automann Number:139.1700
  • Euclid Number:E11432
  • Meritor Number:R801700
  • MPN: R801700-I
SKU 065174-I
$65.75

Bendex type Automatic Slack Adjuster. 1.5 inch 28 spline, 5.5 inch arm length.   Details

20+ In Stock as of June 25, 2022 10:05 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:137.2810
  • Bendix Number:65174, 065174, K065174
  • Dayton Number:05-463
  • Haldex Number:CS56040
  • MPN: 065174
SKU GS6000032825
$22.67

A SORL manual slack adjuster, with 1.5 inch camshaft diameter 28 spline and 5 and 6 inch arm span.   Details

2 In Stock as of June 25, 2022 10:05 AM EST.
  • Slack Adjustor Type:Manual
  • 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:134.2840
  • Bendix Number:286965, 286965N
  • BWP Number:M638
  • Euclid Number:E2458
  • Meritor Number:R822003, R824003, RB23002
  • Midland Number:KN44050, KN44051
  • Manufacturers Part Number:6000032825
  • MPN: 6000032825
SKU KN49020
$59.15

Genuine Haldex offset arm manual slack adjuster with 1.   Details

Typically ships in 5 to 7 business days.
  • Slack Adjustor Type:Manual
  • Slack Adjustor Arm:Offset
  • Camshaft Diameter:1.25 inches
  • Spline Teeth:10
  • Arm Span (A):4.00 inches
  • Arm Span (B):5.00 inches
  • Arm Span (C):6.00 inches
  • Automann Number:134.1014
  • Dayton Number:05-234
  • Euclid Number:E-2760
  • Haldex Number:KN49020, N21133GA, N2902
  • Leland Number:L1377
  • Meritor Number:R822011
  • Spicer Number: 10-392
  • MPN: KN49020
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 June 25, 2022 10:05 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
SKU 05-214
$36.32

Straight arm manual slack adjuster with 1.25 inch camshaft diameter 10 spline, 4.5 and 5.   Details

3 In Stock as of June 25, 2022 10:05 AM EST.
  • Slack Adjustor Type:Manual
  • Slack Adjustor Arm:Straight
  • Camshaft Diameter:1.25 inches
  • Spline Teeth:10
  • Arm Span (A):4.50 inches
  • Arm Span (B):5.50 inches
  • Automann Number:134.1010
  • Bendix Number:278302
  • BWP Number:M-3375
  • Crewson Number:CA4201
  • Dayton Number:05-214EQ, 05-214Q, 05-214
  • Euclid Number:E-4904, E-4904S, E-4904BK
  • Haldex Number:N21149E, N21149F, N21149G
  • Leland Number:L2494
  • Meritor Number:R822009, R822009, R824009,
  • Midland Number:KN48031
  • Spicer Number: 10-399, 10-399-10
  • MPN: 05-214
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 June 25, 2022 10:05 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.S2841
  • Haldex Number:40020212, 400-20212, 409-20006
  • MPN: 40020212-I

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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