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

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

$13.50 AUD
$13.50 AUD
Sale Sold out
Flat $14.99 shipping Australia-wide.

✓ Authorised Volvo Penta Dealer · Marine & auto specialists · Ships Australia-wide

🔧 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 Failure

  • 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

Shipping & Delivery

Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.

Returns & Warranty

14-day returns — if it's not right or you ordered the wrong part, tell us within 14 days of delivery and send it back unused, in its original packaging, for a refund or exchange (return freight is at your cost). Fitted parts, special-order items, marine electronics (unless faulty) and dangerous goods such as aerosols and flares can't be returned, and returns on sale items may be limited to store credit. Manufacturer warranties apply to new parts. Full details in our Refunds & Returns policy.

Not sure this fits?

Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.

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