- 1). Fill the master cylinder with new brake fluid.
- 2). Insert a bleeder hose on the bleeder screw of the wheel cylinder of the furthest brake away from the master cylinder. Place the other end of the hose into a glass container of brake fluid.
- 3). Loosen the brake bleeder screw. Have a helper depress the rod assembly with a slotted screwdriver. This will apply force to the front of the coupler case assembly, forcing out brake fluid and any air bubbles in it. Look for bubbles in the fluid in the glass container.
- 4). Remove the hose and securely tighten the bleeder screw. Repeat the process on all of the brakes. Make sure the master cylinder does not get less than half full.
- 5). Refill the master cylinder with brake fluid once the process is complete. Check that the brakes on your boat trailer are working correctly before continual use.
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