1925 Dunbier H3027 Mackay Trojan Hydraulic Cast Iron Caliper Suits 15mm Rotor | Marine Trailer Part

🔧 Product Description

Dunbier Hydraulic Cast-Iron Caliper for 15mm Rotor - Part Number: 1925

A hydraulic trailer disc-brake caliper manufactured from cast iron and configured for 15/16mm rotor applications. Brake-fluid pressure moves the piston and pads against the rotor to produce trailer braking force.

⚙️ Key Features

• Cast iron caliper body

• Hydraulic piston actuation

• Designed for 15/16mm rotor width

• Marine trailer brake application

• Serviceable pads and hydraulic fittings

📏 Specifications

• Rotor compatibility: 15/16mm

• Body material: cast iron

• Mackay reference: H3027

• Mounting-bolt spacing and bracket offset must match the axle

• Pad set is selected by hydraulic caliper family

🔄 Cross Reference & Related Parts

• Dunbier: 1925

• Mackay: H3027

• Standard hydraulic pad set: Dunbier 1929 / Mackay H3028

• Stainless-backed hydraulic pad set: Dunbier 1930 / Mackay H3028SS

🚤 Trailer Compatibility & Application

• Suits compatible 15mm or 16mm Dunbier hydraulic disc hubs

• Not interchangeable between 11mm and 15/16mm rotor systems without verifying bracket and piston clearance

• Use only with compatible brake fluid and hydraulic actuator

🔌 Function

Converts hydraulic pressure into clamping force at the rotor.

Common signs of wear or replacement:

• Fluid leaks from piston seal, bleeder or hose connection

• Piston sticks and brake drags

• Uneven pad wear

• Caliper body or slide hardware is heavily corroded

• Brake force is weak despite correct pressure

🛠️ Installation & Safety

• Mount to the correct caliper bracket with rated bolts

• Use new copper washers where specified

• Bleed with the caliper positioned so air can escape

• Check rotor runs centrally between pads

• Test braking and check for heat after initial use

📦 Condition

• Genuine Dunbier Marine Products trailer component

• Brand new

• Supplied as one hydraulic brake caliper

• Supplied in original or equivalent packaging