So I'm new to owning a trailer and of course trailer brakes. I got this older 1993 Pace American 6x10 single axle trailer for a pretty good price. The guy that sold it to me said there were no trailer brakes, however I noticed a thick red wire running to the back of each hub. I believed him simply because 1) its old, and 2) it is a single axle 3000lb GVWR trailer. I took apart the hub to clean and re-pack the bearings. Thankfully they were pretty solid, but SURPRISE I have trailer brakes!
They had plenty of spider webs and looked like they hadn't been touched/used/serviced in ages. I'm pretty familiar with drum brakes and how they operate but this one has me a little stumped since there is no brake master cylinder. Does anyone have any experience with something like this? How do they operate? How would I go about checking to see if they are even still functioning/able to function properly?
I'm pushing on the piece that seems to ride along the inside of the drum. What I'm assuming happens is when the piece my hand is on presses against the inside of the drum hard enough (some electrical mechanism?), the arm rotates the square nut at the top and results in the shoes contacting the drum. What causes the initial pressure? There is a spring (rusted to shit) on the opposite side of the contact piece that is supposed to press it outwards but not enough to cause the arm to move. It does take considerable force to move it.