Description

Overview

The inner bush Rockwell 4 bolt supports the S camshaft in heavy trailer brake axles where precise alignment matters. It locates the camshaft inside the 4 bolt bracket, so the cam can rotate smoothly under braking loads. As a result, you maintain stable shoe movement and more consistent brake performance across the axle. Workshops can use this inner bush Rockwell 4 bolt as a direct service replacement when overhauling Meritor Q type drum brakes on trailer applications.

Features

• Dedicated inner camshaft bush for Rockwell style 4 bolt cam brackets on trailer brake axles.
• 41mm internal diameter, 61mm outside diameter and 46mm length to suit common Meritor Q brake layouts.
• Helps control camshaft radial clearance to keep shoe travel predictable and braking response even.
• Supplied as a single inner bush so you can replace only the worn location during brake service.

Specifications and Materials

This camshaft inner bush suits Rockwell pattern 4 bolt cam brackets used with Meritor Q and similar 16.5″ x 7″ trailer brake assemblies. The 41mm internal diameter matches the standard S cam journal size, while the 61mm outer diameter and 46mm length suit the corresponding bracket housing. Part number: FB2233. For broader guidance on heavy vehicle brake system setup and inspection, see this heavy vehicle brake standards bulletin

Compatibility and Fitment

Use this bush on trailer axles that combine Rockwell 4 bolt cam brackets with Meritor Q 16.5″ x 7″ brake hardware or equivalent layouts. Always measure the existing camshaft journal and bracket bore before installation to confirm the 41mm by 61mm sizing will match. Replace bushes on both sides of the axle to keep cam support consistent and avoid uneven lining wear. This cross-reference listing means this part is a suitable replacement for the part numbers and applications shown. Some changes in installation may be required. 15220224, A2-3105-Q-1213, A23105Q1213, BP3008

Compliance and Safety

Only competent personnel should service heavy vehicle brake systems, as incorrect cam support can alter braking behaviour. Always secure the vehicle, chock wheels and follow lockout procedures before working on the axle. After pressing in the new inner bush, check camshaft free rotation, end float and slack adjuster operation on both sides. Then carry out a controlled road test and confirm the trailer brakes apply smoothly without pull, noise or abnormal heat at the drums.

Trailer Applications

Typical uses for the inner bush Rockwell 4 bolt include semi trailers, B double combinations and other on highway trailers running Meritor Q style S cam brakes. Fleet operators can standardise on this bush where multiple trailers share the same cam bracket and camshaft sizing. Additionally, workshops can keep several bushes on the shelf to support planned brake overhauls and quick in service repairs.

Cross-reference and Suitability

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

Use these cross references as a guide and always confirm camshaft diameter, bracket style and axle specification against your existing hardware before installation.

Why Choose ICS Trailers

ICS Trailers focuses on heavy trailer brake and axle components, so our team understands how each cam bush affects real world stopping performance. We select parts that align with known axle and brake combinations to reduce guesswork and downtime in your workshop. Browse Foundation Brakes at ICS Trailers to match this inner bush with compatible cams, rollers, pins and related brake hardware.