I'm servicing the brakes on my boat trailer and found a couple of the Kodiac brand calipers have seized after only two years...not impressed as the original UFP's went 8 years before I had one seize and decided to buy complete Kodiac kits. Anyway bought two new Titan calipers and replacing the brake lines/fittings from the calipers or distribution boxes. I've always had a ***** of a time trying to bleed the system to 100% satisfaction. When the trailer was new if the back up solenoid was disconnected....trailer empty and on level ground the brakes would engage and you could not back up. Never like that after brakes replaced. I've ordered a compressed air driven vacuum bleeder from SG Power and will have it in a week. Anyone tried one of these with good success? I have a hand pump one which sucks.