1979 Dunbier Mechanical Caliper Spring and Bolt (Wishbone Type) | Marine Trailer Part

🔧 Product Description

Dunbier Mechanical-Caliper Return Spring and Bolt - Wishbone Type - Part Number: 1979

A wishbone-style return spring and retaining bolt for the compatible Dunbier mechanical disc-brake caliper. The formed spring applies return force to the operating mechanism while the bolt locates the assembly on the caliper.

⚙️ Key Features

• Wishbone-shaped caliper return spring

• Includes matching retaining bolt as supplied

• Restores mechanical caliper release action

• Alternative spring design to the coil-type system

• Marine trailer brake service component

📏 Specifications

• Spring type: Wishbone

• Includes retaining bolt

• Caliper version must match the original spring arrangement

🔄 Cross Reference & Related Parts

• Dunbier: 1979

• Coil-type spring: Dunbier 1977 / Mackay H3262

• Mechanical caliper: Dunbier 1971

🚤 Trailer Compatibility & Application

• Suits Dunbier mechanical calipers originally equipped with the wishbone spring

• Do not convert between spring designs without confirming caliper compatibility

• Inspect the bolt thread and spring contact points

🔌 Function

Returns the mechanical caliper operating arm and pads to the released position.

Common signs of wear or replacement:

• Spring is cracked, flattened or distorted

• Retaining bolt is loose or worn

• Caliper fails to release

• Spring contact surfaces are deeply grooved

• Brake drag causes excessive disc temperature

🛠️ Installation & Safety

• Secure the trailer and release brake-cable tension

• Install in the original orientation

• Use the correct locking method on the retaining bolt

• Check free caliper movement

• Readjust the brake cable after replacement

📦 Condition

• Brand new Dunbier Marine Products trailer component

• Supplied as one wishbone spring and retaining bolt

• Supplied in original or equivalent packaging