Engineered for dependable trailer braking, the Master Cylinder Bracket & Lever Assembly from Trojan Couplings delivers a precise, snap-lock hydraulic solution that complies with Australian Standard AS4177.3 (1994). Supplied with an operating lever and base, this assembly forms the heart of a reliable hydraulic action upgrade for mechanical operation override couplings, with thoughtful options to suit different trailer configurations.

Two bore sizes to match your trailer needs

The Master Cylinder Bracket & Lever Assembly is offered in 3/4" bore and 7/8" bore configurations. The 3/4" bore version features an alloy body and reservoir for durability and heat management, while the early 7/8" version used a plastic reservoir, with late-model 7/8" cylinders transitioning to all-alloy construction. Early back frames were pressed steel, and the current versions are designed to interchange with those legacy frames, ensuring a smooth upgrade path.

Back frame compatibility and hydraulic conversion

• Back Frame Assembly availability enables converting existing Mechanical Operation Override Couplings to hydraulic actuation, expanding control and performance for your trailer braking system.
• Back frames are designed to interchange with older versions, so upgraded hydraulic actuation can be retrofitted without replacing the entire coupling.
• Mounting is straightforward: two 12 bolts across the rear of most standard braked couplings of the same format, ensuring secure, reliable installation.

Part configurations and what’s included

• T201680 Back Frame & Lever All
• T993050 Back Frame Assembly – Includes Lever & hydraulic Cylinder (3/4" Cylinder)
• T993052 Back Frame Assembly – Includes Lever & hydraulic Cylinder (7/8" Cylinder)
• T993082 Lever Assembly – Includes Pawl (Fold-down type) All
• TPT1038 Plastic Grip
• TPT10391 Master Cylinder Assembly (3/4" Cylinder)
• TPT10392 Master Cylinder Assembly (7/8" Cylinder)

Designed for diverse trailer types

• Back frame assemblies are available in 3/4" bore for 2-wheel braked trailers and 7/8" bore for 4-wheel braked trailers, providing a versatile upgrade path for caravans, boat trailers, and other towed loads.
• Ideal for users seeking secure, predictable braking performance with a robust steel/alloy build and proven compatibility with standard mounting patterns.

Why this configuration matters

Transitioning to hydraulic actuation eliminates the limitations of purely mechanical systems, delivering smoother pedal feel, more consistent braking response, and improved reliability in varied towing conditions. The combination of alloy components, compatibility with legacy frames, and multiple bore options means you can tailor the system to your trailer’s weight, braking demands, and maintenance preferences without sacrificing interoperability.

Practical tips and installation notes

• Confirm bore size requirements (3/4" vs 7/8") to ensure correct cylinder and reservoir compatibility with your trailer’s braking setup.
• Use the Back Frame Assembly to upgrade existing Mechanical Operation Override systems to hydraulic actuation where appropriate.
• When mounting, align with the two 12-bolt rear pattern on compatible braked couplings to maintain secure performance and easy service access.
• Pair with the appropriate Master Cylinder Assembly (3/4" or 7/8") to match your trailer’s axle configuration and load requirements.

Take control of your trailer braking with a purpose-built Master Cylinder Bracket & Lever Assembly that blends durable materials, flexible bore options, and straightforward hydraulic conversion. Whether upgrading an older mechanical setup or equipping a new hydraulic-ready system, this assembly delivers dependable performance, long-term reliability, and a clear upgrade path without unnecessary parts shuffling.