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I wish it was that simple, but our state routes acquisitions through our forestry commission and they have flat refused to go after parts. BTW the hatch on top of the tank i pretty much even with the top of the cage, therefore you wouldn't gain any difference by cutting the top off. I also noticed that the SIXCON sits lower than the top of the cab, when placed in the bed of a M923.
Ha! With the exception of the alternator, the truck runs and drives real well!. I'm to the point of a little fabrication, then painting it. If our other stuff would quit breaking, I'd probably be done by now. Case in point, I sent one to the transmission shop for a fluid and filter change, it came back with a broken exhaust hanger and a muffler hanging less than an inch from the ground! The upside is, the transmission is shifting much better!
The front right glad hand cover should have a bobblehead vent. Make sure it isn't clogged. There shouldn't be a cut-off valve on this gladhand. If there is then make sure it's open or remove it completely. The service side must vent or you end up with the problem you have.
I'll have to look at the front and see if there are cutoff valves, I know there is one on each side on the back.
I've changed the module with a second unit, without any change in results. I'm hoping that the fuse blew.
There is such a thing as bad parts. even NOS. If you have a water tanker on it then you really don't need ABS as it will keep the tires down with the weight. The abs upgrade was mostly for empty trucks traveling at highway speeds sudden braking and the rear end lifts. Fuses are easy to get to if you take off both starter and battery switches and drop those down. It makes it easier to locate them IMO.
I completely agree, unfortunately in my case the weight in the back is irrelevant. For insurance and liability purposes I can't allow a vehicle in service that has issues with any type of safety equipment. One of the first things that gets pulled in any investigation, are the inspection sheets. It's cheaper for me to fix the issue, than to deal with the potential litigation from any accident. The world we live in.... SMH!
Well then you need a new insurance company then. You can simply swap the abs modules with R8 modules and its a non abs truck at that point. Since abs was an add on it takes 20mins to swap both valves. My insurance company knows my abs system is inop and i am still covered for 1 million on bodily damage and 600,000 cargo.
That sounds like a commercial policy, which there are several providers to choose from. Insurance for Public Safety is a much different animal. It's also a much smaller market with many restrictions and requirements. We don't insure the vehicles per say, more like we insure the organization. 15 Stations, 40+ vehicles, 200+ people. I'd rather just fix the ABS. The attorney fees for 2 hours are more expensive than swapping the module.
You do not need to pump air brakes. Pumping air brakes just loses air pressure. Apply them firmly and you should have a pedal. You should apply them and your air pressure should drop 10psi on a tank and hold pressure while the pedal is applied.
The air only gets into the system when the pedal is intentionally pressed. It's just not dumping the air after the pedal is released. Looking a the schematics, it seems the relay valves in the back are responsible for dumping the air, I'm going to check and see if any of them are clogged up. May try to run some tool oil through the system too. I know for a fact the 3rd axle is locking up due to the paint burning off the drums. I need to check the 2nd one.
Just hook your air compressor into the front service gladhand and it will apply the brakes. It could be a sticking inversion valve as well. If you have not downloaded the p2p program i would do so. I know where every air line on the truck goes and its operation and i still have gremlins that confuse me. Your abs modules have vents on the bottom of them. Air dumps back from the service cans into the 2nd port tree from the rear on top of each axle. It then goes back to the stack vent.
