Should Hydraulic Trailer Brakes Lines Have Fittings that Can Swivel or Turn

Updated 07/20/2026 | Published 01/21/2026

Question:

I have a boat trailer that I replaced the brake actuator with the 7500 lb drum brake dexter actuator. The brake line to the drums are pre-existing. I cant connect the line to the actuator because neither the line or actuator have a swivel connector/union. The line binds before I can get it tightened to the actuator. Does someone make an adapter or union that swivels that would allow me to connect the line to the actuator?

asked by: ROB A

Expert Reply:

Hey Rob, the brake line on your trailer should have a male fitting that can spin freely on the rest of the brake line. Is yours a flexible brake line? Is it possible that the fitting is frozen to the line somehow and not letting it spin like it normally would?

Normally a flexible line like the part # DE56GR is used and the fittings can freely turn.

expert reply by: Jameson C

Jameson C.

2/10/2026

Hey Rob, did you find out if the fitting on your brake line was frozen or if you ended up switching to a flexible line like the one mentioned? Knowing what worked could help others dealing with the same brake connection issue.

Jared

7/20/2026

I have the very same issue. I replaced the surge coupler and now just need to reconnect the brake line to the master cylinder and I can’t do it without twisting the flexible hose. My flex hose doesn’t swivel free of the nut. I’m also trying to find some sort of Union that would bring the two pieces together.