to get the horn to sound. you will have to replace the box. you should have a co2 bottle behind the drivers seat with a cable to discharge it right under the drivers seat yes do replace the hoses all of them we used to do it once a year your local benz dealer or vw specialist should have that hose for you.you do need to use the cloth covered hose as we tryed the hose from 6.2 diesels and it wouldn,t stand up.keeep the tub clean as a dirty tub is the leading cause for fires as the brake in the rear throws a lot of sparks. also check the drive sprokets regularly as they are proe to seperation good luck looks like a fun project.I haven't been stuck yet. Sometimes it takes a minute, but I always get out. I am the mechanic on my own rig. Haven't had to do more than tighten the new tracks. I do have a weeping return line on the Mercedes 603 that I will replace tomorrow. (I guess they are return lines, soft hoses that run between the cylinders next to the supply lines)
The BR350 seems to be the one that need a lot of work on it. Everything from track issues to hydraulic leaks.
Oh good. When I push the test button for the fire suppression system, the light comes on, but the horn doesn't sound. How can I check that out? I carry an extinguisher also. Used it when my dozer caught on fire.