Couple of things more. Carefully measure inside diameter of brake drums. If they have been cut, or need cut, you may need to go to oversize lining blocks. Blocks have friction characteristics in the way of letters ff fg hh, etc. Many of factory spec lining for the coaches were designed for commercial use with longevity as first concern, with stopping ability equal or second, and noise maybe third. Anyway, some research as to these characteristics on the lining manufacturer websites, or a good heavy duty brake component supplier that doesn't just have parts pushers, wouldn't be a bad idea. I believe the 4104 parts book had the friction lining letter ratings listed in the description of the lining part number. You may be able to still read it on the side of the brake blocks. Mfgs. stamp this info on them when new and it is pretty durable. I would use new bolts to assemble them or have them riveted to good shoes. If you can still get the hole plugs, you may want to add them also, as it adds a couple of more square inches of braking area, an important consideration, since 4104's don't have as big brakes as newer models. They will need to be filed or ground down flush with the rest of lining, if they stick up some after installation. Remember to use a good dust/ particle mask while doing the brake work to avoid asbestos dust inhalation. Avoid blowing the dust around with compressed air.
You should remove slack adjusters, brake camshafts, and check shaft surface for noticeable wear. New camshaft bushings, springs, rollers, seals etc ought be replaced if worn, rusted or suspect. Any slop or lost motion in the components will cause increase of travel of brake chamber actuator rod before applying brakes. Slack adjusters only have so much travel till they need re adjusted. Also check carefully the machined surface on the axle stub that the inner inside of wheel bearing rides for any wear. Excess wear here will effect proper brake adjustment, and cause oil seal leaking issues, because the hub and drum will ride off center slightly or more so, depending on amount of wear. I don't think this is a common problem, but at least check for it. We did find this problem on our 4104, after a repeat oil seal failure. Do it right this time, and you shouldn't have to do it ever again. Luke can get most parts needed if not available locally. You may want to consider new drums while you are at it. There not that costly considering their size, and you won't have the expense of cutting the old ones and getting oversize lining, rollers, etc.
