Description

Overview

The Automatic Slack Adjuster 28 Spline 38mm helps keep S-cam drum brakes within the correct operating stroke on heavy vehicles and trailers. Because brake adjustment affects stopping performance, this automatic adjuster suits typical truck and trailer foundation brake setups that use a 28 spline 38mm drive.

Features

The Automatic Slack Adjuster 28 Spline 38mm uses an automatic mechanism to reduce the need for frequent manual adjustment. It also provides a 3-hole arm so you can select the most suitable lever length for your chamber and linkage geometry.

• Automatic adjustment to support consistent brake stroke
• 28 spline drive with 1 1/2″ (38mm) spline size
• 3-hole arm with selectable lever lengths
• Clevis pin diameter suits common brake pushrod setups

Specifications and Materials

This unit is specified for Truck & Trailer applications where a 28 spline slack adjuster matches the S-cam shaft. It provides 3 arm positions with arm length A 5″ (127mm), arm length B 6″ (152.4mm), and arm length C 7″ (178mm). It also suits a 5/8″ (16mm) clevis pin diameter at the brake chamber pushrod connection.

Part number: FB4966.

For general inspection and setup guidance, use the Haldex automatic brake adjuster technical manual as a reference

Compatibility and Fitment

This cross-reference listing means this part is a suitable replacement for the part numbers and applications shown, but some changes in installation may be required. 98834-028

Confirm spline count, spline size, and arm geometry against the vehicle or axle specification before ordering. Also check that the clevis pin diameter and pushrod connection match your existing linkage.

Compliance and Safety

Correct adjustment and free movement matter as much as part selection. Inspect bushes, anchor points, and chamber stroke during installation and scheduled servicing.

• Follow OEM brake chamber stroke limits and inspection intervals
• Confirm all fasteners meet the vehicle manufacturer torque requirements
• After fitting, test brake operation and check for drag or binding

Trailer Applications

Automatic Slack Adjuster 28 Spline 38mm suits many common S-cam drum brake configurations used on semi-trailers, dog trailers, and rigid trailers. It can also suit truck applications where the same spline and linkage standards apply.

Cross-reference and Suitability

This part cross-references to or suits the following equivalent part numbers and compatible alternatives:

Finally, treat cross-reference numbers as a guide only, and verify spline and arm requirements before purchase.

Why Choose ICS Trailers

ICS Trailers backs practical part selection with local knowledge and reliable supply for heavy vehicle braking components. If you need help confirming slack adjuster geometry for your setup, the team can point you to suitable options and related foundation brake hardware. Browse Foundation Brakes at ICS Trailers in the Foundation Brakes at ICS Trailers category.