H3341 Mackay 1029 Dunbier Coupling Master Cylinder & Hand Brake Assembly | Marine Trailer Part
H3341 Mackay 1029 Dunbier Coupling Master Cylinder & Hand Brake Assembly | Marine Trailer Part
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🔧 Product Description
Genuine Mackay Marine Trailer Products Hydraulic Override Coupling Master Cylinder and Handbrake Assembly – Part Number: H3341
A replacement hydraulic master-cylinder and parking-brake lever assembly for the Dunbier 2,000kg hydraulic override coupling. It converts coupling overrun movement into hydraulic pressure while also providing a manual handbrake function for parking.
⚙️ Key Features
- Complete replacement hydraulic actuation assembly
- Includes master cylinder and handbrake mechanism
- Designed for Dunbier hydraulic override coupling 1030
- Restores serviceability without replacing the full coupling body
- Suitable for marine-trailer hydraulic disc or drum brake circuits using the correct fluid and cylinder specification
📏 Specifications
- Application rating: Dunbier 2,000kg hydraulic override coupling system
- Tow-ball size of parent coupling: 50mm
- Hydraulic connections and master-cylinder bore must match the original installation
🔄 Cross Reference & Related Parts
- Mackay reference: H3341
- Parent coupling: Dunbier 1030
- Reverse stop and pin: Dunbier 1042C / 1046
- Matching 50mm tow ball: Dunbier 1061 / Mackay H3354
🚤 Compatibility & Application
- Dunbier 2,000kg hydraulic override couplings using this master-cylinder/lever arrangement
- Brake fluid type must match the braking system and component manufacturer requirements
- Hydraulic circuit must be bled and leak-tested after installation
🔌 Function
Converts compression of the override coupling into hydraulic brake pressure and applies the trailer parking brake when the hand lever is engaged.
⚠️ Common Signs of Failure
- Brake fluid leaking from the cylinder or pushrod
- Coupling compresses without applying effective trailer braking
- Handbrake lever will not hold or release correctly
- Spongy braking caused by air or internal seal bypass
- Corroded reservoir, seized pivot or damaged return mechanism
📦 Condition
- Genuine Mackay Marine Trailer Products part
- Brand new
- Supplied in original or equivalent packaging
Shipping & Delivery
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
Returns & Warranty
14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in new, unused condition for a refund or exchange. Manufacturer warranties apply to new parts. Full details in our Refunds & Returns policy.
Not sure this fits?
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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