Originally Posted by Mnoel
If your are on a Workhorse Chassis, very likely warped or cracked rotors due to dragging calipers. There was a recall to replace faulty calipers some years back.
If they are disk type. At the age of your coach and assuming you have not recently overheated the brakes, like on a steep down hill grade, then a caliper is probably sticking causing the rotor to overheat and warp.
Loose wheel, bad wheel bearing could be possible. These might also cause clunking noise when turning.
If it is caliper/rotor issue, I would replace both front brake assemblies from the caliper out. Caliper, rotor,pads.
Severe steering wheel shudder tells me the issue is with the front steer axle and they are probably disk brakes. Out of round drums will usually surge more than shudder.
You may have disk brakes on front, drum on rear. Possible you have disk all the way around.
Like Tony said, doesn't matter how fast you are capable of going if you can't stop.