Please help
Went to use the boat on the weekend and found that the wheels on the trailer were not moving, this trailer holds a 2.5 tone boat, so they are hydrolic disc brakes. treid using the relese valve and disconnecting the emergency brake system, but still could not get it to unlock. after awhile we manged to un lock 3 of the wheels which we thought was abit strange. the boat had not been used for awhile and as we found out after we jacked up the boat and took the wheel off, was one of the brake pads was stuck on the rotor. the caliper was not putting any pressure on the pad but the pad had rusted on to the rotor.
we have alwys washed the brakes and the boat and trailer is regularly serviced, but what i am woundering is how we stop this from happening again. the brakes have to be on when the boat is parked so is there something that we can apply to stop the rust, which would not harm the pad itself
please help
thanks