7/8-inch Hydraulic Trailer Master Cylinder
7/8-inch Hydraulic Trailer Master Cylinder, Override, Single, Tandem and Tri-Axle
7/8-inch Hydraulic trailer master cylinder to suit 2,000kg override couplings. Best suited to 14-inch, 15-inch and 16-inch wheels.
The trick to an efficient hydraulic braking system is correctly bleed and adjusted brakes. Once the brakes bleed, tighten the nut on the back of the brake lever.
Three types of hydraulic trailer brake master cylinders are now available for purchase.
- 3/4 inch - Hydraulic Single Brake Trailers.
- 7/8 inch - Hydraulic Tandem Trailers.
- 1 inch - 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.
Precise instructions can be found from Al-ko here
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
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.
Additional information
| Weight | 2 kg |
|---|---|
| Dimensions | 30 × 15 × 10 cm |
