My suspension is set up such that when no boat is on the trailer, the axle with the brakes is not on the ground. I assume this is by design as it will eliminate any brake locking or chatter when the trailer is empty.

I think Florida reqr brakes on all axles too for anything over 3500#. I have a small boat 4500# and have tandem stainless disks, if I had the trailer to do over gain would go with. But I have brake issues, I love brakes. I figure brake upgrades cost same as my dectuctible and less hassle.

Recently, I was driving down the road towing my boat. On the trailer its about 8K total. A deer ran out in front of me and I mashed the brakes and slowed enough to avoid killing Bambi. I have discs on both axles. It was expensive but WORTH it.

My question for YOU is did you have to re-arrange the cans of baked beans and OTHER canned goods that spilled in the cabin:evilb:,that Char INSISTED on bringing with you,your buddy-Smitty

I have disc brakes on one axle . If I want to add brakes to the other axle also will the master need to be changed ? Will it pump enough fluid for 4 calipers instead of just 2 ?

Same coupler, you can just tee off the line and add the additional axle's brakes.