I'm currently modifying my 1977 Scamp
frame to mount a Flexiride axle under it with the arms facing rearward. Originally the axle was mounted behind the drop floor with the arms facing forward. The new axle will be mounted so it goes under the drop floor.
I bought 7-inch Dexter brake assemblies and drums from etrailer.com. I was going to buy them locally but saved $100 by buying them online.
Shortly after I received them, I mounted them on the Flexiride spindles because I wanted to see if the hub face to hub face dimension would be the same as what it was with the idler hubs that came with the axle. To my delight it is the same!
I've attached seven pictures to this message so you can see in detail the Dexter 7-inch brakes on the Flexiride spindles. Just click on the thumblnail image to enlarge them.
The first picture shows the one-piece hub and drum on the spindle. I'm going to use my original wheels which are 4 on a 4-inch diameter hole pattern. They are still in good shape and I'd have to modify the spare tire mount on the back wall to mount the more popular 5 on 4.50-inch diameter hole pattern. I think my wheels will look good after re-painting them white and slapping on some baby moons and beauty rings.
The second picture shows the backside of the drum and the backing plate of the brake assembly attached to the Flexiride spindle arm. I had to buy the nuts to secure the backing plates on the arm. They did not come with the assemblies. I found an exploded view of the brake assemblies on the Dexter web site and it only shows a nut going onto the stud. I'd like to add a lockwasher but there aren't enough threads exposed.
I don't like the way the insulation of the wires is touching the backing plate as they pass through the hole. It could wear through with vibration and create a short circuit. There is a woven tube around the wires inside the brake assembly to protect them from the moving parts. Maybe I can slide it a little farther outside of the hole.
The third picture shows the large hex nut that holds the bearings on the spindle. It is 1.465 inches over the flats so a 1-1/2 inch wrench will fit it. I was expecting to see a cotter pin in between the slots on the castle nut. Instead there is a tang-type washer because these are EZ Lube spindles. I had no idea the Flexiride was an EZ Lube spindle. This is the first time I've seen these. I had to bend the tang out of a slot in the nut to get the nut to spin off.
The fourth picture shows the spindle, bearing and brake assembly after the hub has been removed. Since the axle is clamped upside down on two saw horses the magnet is up in this picture. Normally it is down when the axle is installed on the trailer.
I noticed the magnet is loose on a square-formed sheet metal shaft with a spring behind it. I have never seen or worked on electric trailer brakes before. Seeing how loose the magnet is I thought that it would rub on the inside face of the brake drum. After a little while it dawned on me that is how the electric brakes are actuated. When the magnet is energized with 12 volts it is attracted to the spinning hub face which pulls it and causes the brake shoes to expand against the drum.
There are shallow holes in the plastic or resin face of the magnet. These are wear indicators. When the holes go away the magnet needs to be replaced.
The fifth picture shows the inside of the brake drum so you can see the smooth face where the magnet rubs.
As soon as the UPS man delivered the hub and brake assemblies to me I opened the box and put an old 8-inch wheel on the hub to see how it fits. It is tight but it does seat on the hub face. This is critical. My trailer will be raised by the new axle and the 8-inch wheels and tires
will allow me to get the Scamp into my garage through a 7-foot high door opening. Because this is a Flexiride axle I can adjust the ride height if needed in order to get it inside the garage.
The sixth picture shows the spindle with the hub and bearings removed. You can see the EZ Lube zerk fitting on the end of the spindle and the hole where the grease comes out just inside the seal on the hub. I'm not sure if I will use it. I think this feature is more important on boat trailers where the axles are submerged in water. Making sure the bearing cavity is full of waterproof grease would probably help keep water out.
The seventh picture shows the axle with the idler hubs that came with it. My axle is 63 inches hub face to hub face. The distance over the outside of the mounting brackets is 49 inches. This gives me 45 inches between the mounting brackets which is what the inside width of the Scamp frame is.
I ordered it with a 2000 lb rating. I had read that current 13-foot Scamp factory axles are rated at 2200 lbs. The original Henschen axle I just removed from this 1977 Scamp was rated at 1200 lbs.
I had been meaning to add this brake information to another discussion about Flexiride axles but felt is was more appropriate to this one. Here's a link to the other thread:
Anyone have experience with Flexride axles?
I hope this helps. Let me know if you need more information, pictures or measurements from my axle and brakes.