ARK 7/8″ Hydraulic Brake Master Cylinder – Suits Override Trailer Couplings (SKU: MSK78)

ARK MSK78 Hydraulic Master Cylinder is a compact and efficient 7/8” bore cylinder designed to activate hydraulic brake systems on trailers and caravans. It’s the perfect fit for override couplings that use hydraulic piping to transfer braking force to drums or disc calipers.

With a 60mm bolt spacing for easy mounting, this cylinder is suitable for use in tight coupling housings where space is limited but reliable braking performance is essential. Its precise internal bore size delivers smooth brake engagement and dependable towing safety.

Key Features:

• 7/8″ bore hydraulic master cylinder
• Designed for use with override brake couplings
• 60mm bolt centre spacing for standard mounting
• Compatible with hydraulic piping brake systems
• Ideal for light to medium-duty trailers and caravans

This compact master cylinder is your go-to choice for precise braking in setups that require minimal space and maximum control.

FAQ

Q: What is the bore size of this master cylinder?

A: The MSK78 has a 7/8 inch (22.2mm) bore diameter.

Q: What type of trailers is it suited for?

A: It’s ideal for light to medium-duty trailers using hydraulic override brake systems with piping.

Q: Is it compatible with disc and drum brakes?

A: Yes, as long as they are connected through a hydraulic system, this master cylinder can be used for both.

Q: What is the bolt spacing?

A: The distance between the two mounting bolts is 60mm.

Evaluation & Recommendation

The ARK MSK78 is ideal for space-restricted installations and trailers where slightly less fluid output is acceptable. It’s smaller than a 1” master cylinder but still provides accurate hydraulic pressure for effective braking.

Recommended for:

• Small to medium boat trailers and campers
• Hydraulic brake systems using steel or rubber piping
• Users needing a lower-profile alternative to 1” cylinders

Installation Tips:

• Verify bolt spacing and coupling compatibility before fitting
• Use quality brake fluid and bleed the system thoroughly
• Ensure piping is securely connected to prevent leaks

Still unsure if 7/8” or 1” is right for you? Reach out with your trailer details and we’ll recommend the perfect match.