Hydraulic Trailer Master Cylinder, Override, Single, Tandem and Tri-Axle
Hydraulic trailer master cylinder, 3/4″, 7/8″, 1″ to suit 2,000kg override couplings. Best suited to 14″, 15″ and 16″ wheels.
Three types of hydraulic trailer brake master cylinders are now available for purchase.
- 3/4″ – Hydraulic Single Brake Trailers.
- 7/8″ – Hydraulic Tandem Trailers.
- 1″ – Hydraulic Tri-Axle Trailers
A zinc bracket is required brake for hydraulic braking systems.
- Fit the master cylinder bracket on the rear bolt mounts
- Bolt hole mounts are 54mm between centres
- Select 1/2 inch bolts that bolt right through your bracket, coupling and drawbar
- Disconnect the parking brake
- Adjust the lower nut 2mm from the back of the override then lock it off.
Further, we have more information from our engineer
- you must have at least 2mm free play, between 2mm and 5mm when the hydraulic brake pads start to wear
- if there is no free play, as soon as the brakes start to work and get a little warm, you will start to get brake build-up, increasing heat and burning out your brakes or even popping the seals in the master cylinder
3/4″ Master Cylinder
The 3/4 inch master cylinder is the crucial braking component used on single axle braked trailers. These trailers have with two-wheel cylinders.
3/4 inch refers to the piston bore size.
Further, you’ll also buy a wide range of braking system components like 9-inch hydraulic brake shoes, hydraulic drum brake, and even electric brake parts.
7/8″ Master Cylinder
The 7/8 inch master cylinder is the crucial braking component used on tandem trailers with four hydraulic cylinders.
The plastic bowl version is susceptible to UV degradation, and as a result, it will need to be replaced every five years or so.
1″ Master Cylinder
The 1-inch master cylinder is used on tri-axle trailers with an ATM up to 2000kg. One inch refers to the bore size.
In cases where six hydraulic calipers are used, they will require a higher pressure of the hydraulic fluid.
Alternatively, some boat builders like the steel body and steel cap in preference to plastic caps that suffer UV degradation.
What type of brake fluid should I use?
DOT 3 or DOT 4 is what should be used in your boat trailer. DOT 5 cannot be used in trailer brake systems unless stated explicitly by the actuator and brake manufacturer. This type of hydraulic oil does not absorb water, and the silicone in the DOT 5 makes the seals swell and can bind up caliper pistons.
Do not use DOT 5 or silicone brake fluids in any brake system including individual actuators, disc brakes, drum brakes or solenoids.
Purchase spare parts and other trailer parts here
Couplemate Trailer Parts sells only the best quality Hydraulic Trailer Master Cylinder and caravan spare parts throughout Australia.
Customers are welcome to either pickup or take advantage of our low freight rates. Express shipping to Melbourne, Sydney, Brisbane, Perth, Adelaide, Darwin, and Hobart.
We also ship products to New Zealand via Australia Post Air Express.
© Steve Wotherspoon March 5, 2016. Images and text may be copied, provided a link back to the copied page and the source is displayed where the content or image is located.