I've been hearing a clunk coming from the rear-right brake for some time and with a trip coming up it is high time to fix it. While I have things apart I'll also use a flap wheel to clean up the springs for a smoother ride. Here's the progress:
Popped the axle shaft out. It's real easy. Just a couple bolts and it slides right out.
Oh, don't forget to drain the differential! I forgot and some gear oil dumped out of the hub.
The bearings also need to be removed. I don't own such a giant socket so I used a chisel and tapped the retainer nuts out.
The next step was to disconnect the flexible brake line coming from the caliper and the solid brake line on the axle. Then I grabbed the Moto4 and pulled the wheel assembly off!
I have a friend who is a heavy-duty truck mechanic and he says that when they're doing this job on logging trucks out in the bush they use a slab of cardboard with grease smeared all over it so the wheel assembly slides easily out. I didn't want to deal with the mess
This is the rotor I'm going to replace. I suspect that, due to the caliper sticking and overheating the rotor, it is now warped. 10 bolts takes it off.
Pffft.. those pads are hardly worn! I'll be reusing them.
Took the leaf springs off. They are strapped so I can remove the center bolt. It worked well. I used an angle grinder and split the nut in half. One whack with the hammer and the spring pack separated. The straps worked well to keep things from taking off.
Cleaned up the first caliper. Everything is rusty on this bus, but I haven't found any rust that is affecting it's safety. This caliper is a prime example. It has all sorts of surface rust, but, despite the rubber boots around the pistons being cracked, the cylinder bores are in fine shape.
This is one of the pistons. They are of the phenolic type, so don't rust. Awesome.
I don't know much about phenolic caliper pistons, but word on the street is that they transmit less heat to the fluid. Despite that it seems that lots of people don't like them because they're more prone to sticking. I would have expected them to be LESS likely to stick, but that's what internet tells me.
That's all for now! I'll be back at it this afternoon.