Summary of Contents for Haldex S-ABA
- Page 1 Service Manual S-ABA (Self Setting Automatic Brake Adjusters) Truck and Trailer Applications...
- Page 2 Warning: Haldex strongly recommends routine visual checks be performed at EACH maintenance service interval. Foundation brake operational checks utilizing CVSA Level 1 Applied Stroke Criteria should always be utilized. Manual adjustment of within the foundation brake. Brake components such as s-cams, bushings, return springs, actuators, drums and adjuster installation MUST be within manufacturer’s...
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Page 3: Table Of Contents
The descriptions and specifications contained in this service publication are current at the time of printing. Haldex Brake Products Corp. reserves the right to discontinue or modify its models and/or procedures and to change specifications... -
Page 4: S-Aba Operation
S-ABA Operation The Haldex S-ABA automatic brake adjuster is a clearance sensing brake adjuster that maintains a nominal distance or clearance between lining and drum. When the Adjuster is Worm Wheel Installed: Regulator Gear With the brake in the released... -
Page 5: Steer Axle Applications
Typical Applications Steer Axle Figures 1 and 2 show typical brackets for automatic brake adjuster applications on steer axle brake assemblies. Refer to pages 4 and 5 for detailed installation procedures. Figure 1 Figure 2 Steer axle with strap bracket Steer axle with clamp bracket and flat anchor stud Drive Axle... -
Page 6: Trailer Axle Applications
Typical Applications Trailer Axle Figures 5-8 show typical brackets for automatic brake adjuster applications on trailer axle brake assemblies. Refer to pages 4 and 5 for detailed installation procedures. Figure 5 Figure 6 For 16-1/2” Brake Assemblies For 12-1/4” Brake Assemblies Figure 7 Figure 8 Integral cam support anchor bracket... -
Page 7: S-Aba Installation Procedures
S-ABA Installation Procedures Note: Configuration of anchor bracket and brake adjuster housing may vary, depending upon axle. Refer to typical applications on Pages 2 and 3. STEP 1 Note: Block wheels to prevent vehicle from rolling. Ensure system tank pressure is above 100 PSI. - Page 8 S-ABA Installation Procedures STEP 3 Figure 11a The S-ABA control arm can be placed anywhere within the range of the bracket slot for automatic adjustment to take place. Haldex recommends a “common position” for all installations, to avoid confusion for the end-user.
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Page 9: Routine Visual/Operational Checks
MUST be replaced immediately. Automatic adjusters should not be operated as manual adjusters except as may be necessary to get the vehicle off the road for service. Service and Lubrication Intervals for Standard Haldex AA1 and S-ABA Brake Adjusters Adjuster Manufacture Lubrication... -
Page 10: Foundation Brake Operational Check And Troubleshooting
Foundation Brake Operational Check/Troubleshooting Note: Block wheels to prevent vehicle from rolling. Ensure system reservoir pressure is at 90-100 psi. Check that push rod is fully retracted; apply air to release spring brake. North American Commercial Vehicle Safety Alliance (CVSA) Uniform Vehicle Inspection Criteria: The applied stroke of the brake should be checked per CVSA guidelines at 90-100 psi reservoir pressure. - Page 11 Free Stroke (cont’d) Free Stroke Above The Range If the free stroke is above the range and the applied stroke is too long, there is a problem with the foundation brake or the adjuster. Check the following and reference CVSA out-of-service criteria: Component Cause Action...
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Page 12: Brake Adjuster Checking Procedures
Automatic Brake Adjuster Checking Procedures If the brake adjuster is not maintaining the proper applied stroke, before removing the brake adjuster, check the condition of the foundation brake (see pages 7 & 8). If after inspecting the foundation brake no apparent problems are found, inspect the automatic brake adjuster to determine if it is operating properly. -
Page 13: Typical Parts Identification And Location
Off Vehicle Inspection Component Cause Action Adjuster not Low clutch Place adjuster arm in vise. Rotate the 7/16” functioning torque adjustment hex counterclockwise one full turn to check de-adjustment torque. After control arm properly stops rotating, a minimum of 13 ft. lbs. will be required and a ratcheting sound will occur. -
Page 14: Torque Specifications
Torque Specifications Note: Tighten all fasteners to manufacturer’s recommendations unless otherwise specified below. Flat Anchor Stud Pin Torque to 40-50 ft. lbs. when installed Round Anchor Stud Pin with Fabricated Ring Clamp Torque to 15-20 ft. lbs. when installed Round Anchor Stud Pin with Slide Nut Torque to 15-20 ft. -
Page 15: Frequently Asked Questions
Haldex manufactures the right adjuster arm for your specific application. Haldex adjusters are 11. How much control arm bushing unhanded (no lefts or rights) in the majority of and anchor stud pin wear is applications. -
Page 16: Additional Parts And Service Information
Installation Tips — Automatic Brake Adjuster (Pocket Size) ........L20397 Parts Information Parts and Cross Reference Guide (Truck/Trailer) ............L00090 Supplemental Automatic Brake Adjuster Kits ............L20447 These materials are readily available on the Haldex website haldex.com, or you may order copies by contacting your Customer Service Representative at 1-800-643-2374. - Page 17 Notes:...
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- Page 20 Listed on the Stockholm Stock Exchange, Haldex has annual sales of approximately 3.9 billion SEK and employs about 2,200 people. To learn more, contact your Haldex sales professional. L30037 United States 816-891-2470 For additional contact information Canada 519-621-6722 or to learn more about Haldex, US Rev.