Description

Overview

Standard Forge inner bush 50mm keeps the brake cam supported and aligned on Dana and Standard Forge trailer axles. It helps maintain consistent brake actuation, reduces camshaft movement and supports reliable performance in heavy vehicle foundation brakes. This compact bush suits workshops that want a direct replacement without reworking the brake spider or hanger bores.

Features

• Supports the brake cam in Standard Forge style trailer brake assemblies for stable, repeatable operation
• 50mm length with 38mm ID and 48mm OD for a snug fit in correctly matched brake hardware
• Simple press-in design that allows efficient bush replacement during brake overhauls or scheduled maintenance
• Suitable for busy workshops that service Dana and Standard Forge axles on fleets and general freight trailers

Specifications and Materials

This inner bush measures 50mm in length with a 38mm internal diameter and a 48mm outside diameter, so it suits correctly machined Standard Forge brake housings. The construction is designed for harsh trailer brake environments where contamination, vibration and repeated braking cycles are common. Part number: FB2108.

For general background on how plain bush bearings support rotating shafts, refer to this plain bearing technical guide from Wikipedia

Compatibility and Fitment

This inner bush is intended for Standard Forge style trailer axles using 12 1/4 inch by 7 1/2 inch foundation brakes where the cam runs in dedicated bushes rather than directly in the hanger or spider. Additionally, it is suited to workshops that are already using cross-referenced part numbers from major brake and axle manufacturers on similar brake sets.

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. 28-1257, 405109, BP2104, E-661, FL28.1257, M10WJ178, WT2104

Compliance and Safety

Correctly supporting the brake cam helps the foundation brakes work as designed and reduces the chance of uneven shoe contact. Always inspect the cam, spider and hanger bores for wear or cracking when you change an inner bush, and replace any damaged components at the same time. In addition, check that end float and cam rotation feel smooth and free before returning the trailer to service.

Trailer Applications

This Standard Forge inner bush 50mm suits heavy trailers that run Dana and Standard Forge axles on general freight, tipping, curtain-side or skeletal work. Workshops can use it during full brake relines, camshaft replacements or preventative maintenance programs on fleets that rely on 12 1/4 inch by 7 1/2 inch brakes. Furthermore, it fits into upgrade or refurbishment jobs where older bushes have worn, deformed or seized on the cam.

Cross-reference and Suitability

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

Always verify these numbers against your existing components, catalogue data or workshop records before finalising any replacement or fleet standard.

Why Choose ICS Trailers

ICS Trailers focuses on heavy vehicle trailer parts, so you can match bushes, cams and brake hardware with confidence. Our team selects parts that suit real workshop conditions and supports consistent, reliable braking across mixed fleets. Browse more Foundation Brakes parts at ICS Trailers by visiting our Foundation Brakes category