I'm no trailer brake expert, but I agree, it sounds like air in the lines.
Two Chrome 10 hole wheels with Kenda Loadstar radials.
Mounted, balanced and delivered.
PM or email me for tire, wheel or package pricing.
CARBURETOR REBUILDING - $199
Parts, labor and return shipping included
Holley Marine 4160 Freshly Rebuilt $349 - Delivered
2 LED 6" BRAKE LIGHTS DELIVERED $32