same size/length trailer that my 43 was on that worked fine!! bottom of the 477 is same as old 43!!!

all I am look'n 4 is properly work'n brakes w/ a 1/2 to 1 second delay like my 06 myco, not 3-4 seconds! other than that boat pulls & loads great, just like my 06 did!! don't think that is unreasonable to look 4 from a supposed top shelf trailer maker!!! do U??????

Possible solution !
 

simpson drag chute from JEGS !:lolhit:

hey old man, just cuz your Depends work like that 4 U!!!!:evilb:

A deal for you !
 

I'll lend you one if you'll pack it for your next attempt.:evilb:

Delay
 

One thing I would suggest, and I apologize if this has been mentioned previously, is to make sure the hydraulic system has been properly bled and does not have air in it.

I'm having problems with a E/H system too. If I pull the break away when the trucks started they seem to work. I'm pulling with a 2008 GMC I just jack knifed the trailer going down a hill because the brakes didn't come on and I got into some gravel and shoved sideways. Just got the truck out of the body shop after a $4,100 bill. Our trailers now in a shop in STL so they can figure it out. It's also a newer Myco trailer. I'll let you know what they find out too.

Good battery on trailer?

Wrink, I think if there were any air in the lines or a restriction there would be a delay time for the pump to build any pressure to the calipers. If there is no air in the lines or restriction and after several trucks and brake controllers, I think that leaves the pump. But I would make sure they are bleed real well before I went to the pump. P.S I'm not so sure steel lines are better, lined or stainless maybe, but I have had too many plain steel lines fail on me. Plastic doesn't rust from the inside out and seems to take some flexing. Just my opinion. Doug

Actually when the trailer/boat was delivered on May 25, I called myco that day & told them there was a 6-7 second delay( I had been used to 1/2-1 second at most w/ my 06 myco I had for years), after a few days myco had a local trailer man bleed the system & I believe he may have even changed out some trailer components! We did go from the 6-7 sec delay to 3-4 seconds!! but my baseline is my 06 trailer/same truck, delay as stated above & that is what I expect for the safety of passengers, cars/people around me & value of my boat!!! personally I believe ALL components on the trailer should B removed, replaced, bleed & start from scratch & C what happens!!!!