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In your smugness you forget that at the start of it all it's supplied by the same compressor and main pressure tank AND the same main feed hose. It is NOT two separate closed systems yes, it is split past the main pressure tank with a small parking brake tank so the spring brake will stay pressurized while one drives but if the main feed line or anything prior to that fails the whole system fails and the vehicle stops.
The big thing that RV'ers need to remember is that the spring brake system is NOT on the front wheels. This has and does come into play when leveling the rig and bringing the rear wheels off the ground (something Semi's don't ever do). RV's have rolled away due to this issue.
Now to answer your other statement, at 21 I cut my teeth on semi's as a heavy (big rig) tow truck driver, you know the guys who actually have to figure out how to bring the rigs into your shop by pulling axels,drivelines and either airing up or disabling the parking/service brake systems 24/7 no matter the weather.
Boy, you are really splitting hairs on this one.
Yes, the commonality of the power source, in this case ... compressed air ... to actuate the brake systems.
But the parking (spring) brake and the service brakes remain separated in use except for the mechanical linkage from the parking brake can pressing upon the same actuator rod that the service brake uses.
You might just as well claim that all electrical/electronics systems in a vehicle are linked together because they use the same power source to accomplish their function. The wipers and the window motors and the ignition system are all "linked" to the electrical source ... along with the seat motors, mirror motors, fuel pump, headlights, and so forth. Yet they all are independent users of the power ... just like the park brake system and the service brake system are independent of each other except for the mechanical aspect of actuating the brakes.
congrats on your service to the industry. You've been out there just like the rest of us slogging away to keep the rigs moving. Have a nice day.
Actually, the only correct answer to the original question is: It depends!
It depends on the state that issued your drivier's license.
It depends on the size/weight of the motorhome.
It depends on whether or not you are using the motorhome for commercial purposes.
Why is it when someone post a spefic question it turns into a question about things not even related to the original question. He only wanted to know if he needed a cdl to drive a motor home not on how airbrakes worked man why dose simple questions turn into a technical debate. It happens allot on here some on here have to micro analyze a subject and bring science into it like what’s your favorite oil, when someone says like i like Mobil 1 someone has to start talking about the structure of how it’s made. Just say your favorite oil and be done with it don’t micro analyze it and say why you think it’s the best or not.
Yes, the commonality of the power source, in this case ... compressed air ... to actuate the brake systems.
But the parking (spring) brake and the service brakes remain separated in use except for the mechanical linkage from the parking brake can pressing upon the same actuator rod that the service brake uses.
You might just as well claim that all electrical/electronics systems in a vehicle are linked together because they use the same power source to accomplish their function. The wipers and the window motors and the ignition system are all "linked" to the electrical source ... along with the seat motors, mirror motors, fuel pump, headlights, and so forth. Yet they all are independent users of the power ... just like the park brake system and the service brake system are independent of each other except for the mechanical aspect of actuating the brakes.
congrats on your service to the industry. You've been out there just like the rest of us slogging away to keep the rigs moving. Have a nice day.
The reason I "split hair's" was the original post was basically correct. Most people outside the (our) industry don't understand or care about the details, finding one that is willing to at least understand the basic idea or possibly giving the basic understanding to someone driving by this thread is a win in my book.
Why is it when someone post a spefic question it turns into a question about things not even related to the original question. He only wanted to know if he needed a cdl to drive a motor home not on how airbrakes worked man why dose simple questions turn into a technical debate. It happens allot on here some on here have to micro analyze a subject and bring science into it like what’s your favorite oil, when someone says like i like Mobil 1 someone has to start talking about the structure of how it’s made. Just say your favorite oil and be done with it don’t micro analyze it and say why you think it’s the best or not.
You want to see a thread really go sideways, I double dog dare you to ask which is better to buy, a Gas or Diesel RV or Pickup...
Actually, the only correct answer to the original question is: It depends!
It depends on the state that issued your drivier's license.
It depends on the size/weight of the motorhome.
It depends on whether or not you are using the motorhome for commercial purposes.
Why is it when someone post a spefic question it turns into a question about things not even related to the original question.
I can tell you haven't been on C-D that long!
After 10 years on here, it's about 1 out of 100 threads that don't go off on tangents or have side conversations throughout the thread, you'll get use to it, don't worry!
As far as I know, you do not need a CDL. IMO, it's a huge mistake to just put a driver behind the wheel, there should be some sort of driving test to ensure the person can handle the vehicle, there should also be the same type of test for those pulling campers over a certain size....you can't just drive these things like cars.
It's quite dumb for any driver to put himself or herself behind the wheel of any vehicle, motorhome, or truck-trailer without knowing how to drive it. All you have to do when you buy a motorhome, if you don't know how to drive it, is to attend a training class.
To drive a motorhome, or to tow a trailer does not require but a driver's license.
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