Air behavior

[Iceclimber]

Originally Posted by crb478

The way the air system is designed, the factory designed so a slight leak is OK. If it will hold air for over 24 hours they do not consider it a problem. Now being air tight would be ideal, but the system is designed to provide more air than you will need without a major leak.

Chasing minor leaks is always a good idea, but some leaks will give you a fit trying to locate them.

My point is minor leaks are no to be feared as the air pump should be able overcome the leak. Hopefully this will be helpful.

Good advice thank you. As this coach sat for some years, I am taking it in just for an inspection and if they spot leaks etc then ok.

[MSHappyCampers]

My air goes down to about 30PSI over several days. Our coach has air leveling and has an auxiliary pump that keeps it level when the main supply is low!

[Traveler2162]

Originally Posted by Iceclimber

I know less than jack about air systems, would I go to Cat Diesel for something like that for the inspection and possible repairs ?

You better check your laws in your state. Most places require an airbrake endorsement on your license. Get in an accident without it and you could be in dodo..

[beenthere]

really ..u must live on upper east coast. how many states u talking??

Originally Posted by Traveler2162

You better check your laws in your state. Most places require an airbrake endorsement on your license. Get in an accident without it and you could be in dodo..

[bentjm]

Originally Posted by 96 Wideglide

The brakes on one end of your coach should be getting air from the primary dry tank, the other end from the secondary dry tank.
Your suspension probably from the secondary tank.
If you rupture a or all air bags, you have pressure protection valves (PPV), that will only allow your tank to drain to about 65-70psi before they close. Only the brakes can use the remaining air pressure. Same for any other feature that uses air (horns, step covers, generator slide etc).

That explains a lot about how it acts . Thanks.

[DRM901]

Originally Posted by beenthere

really ..u must live on upper east coast. how many states u talking??

Texas requires a class B CDL to drive vehicles with a GCWR greater than 26,000, and part of the test includes the air system.

[beenthere]

. and only few states require class b. and its easy air questions. imho. not arguing just most states not even close require endorsment or even class b. by the way what questions do they ask??

[twinboat]

Originally Posted by DRM901

Texas requires a class B CDL to drive vehicles with a GCWR greater than 26,000, and part of the test includes the air system.

Are you sure it's a CDL ?

That's for commercial driving, not RVs.


Just checked no CDL required

Do I need a special license to drive an RV in Texas?

Texas operators of RVs for personal use, regardless of weight, are exempt from CDL requirements. For this reason, their special licenses are often called “Class A (or B) ... non-CDL” to distinguish them from both CDLs and the regular Class C driver license used for regular passenger automobiles.Aug 17, 2020

[DRM901]

I've seen everyone call it that, and you have to take a subset of the CDL test, but it isn't technically a CDL license.

[DRM901]

Originally Posted by beenthere

. and only few states require class b. and its easy air questions. imho. not arguing just most states not even close require endorsment or even class b. by the way what questions do they ask??

They ask about the cabin precheck, physical inspection, general operation, and pre-trip check.

[Realmccoy270]

I just got my “non cdl class b” in Texas in December. Written test on Chapter14 of cdl handbook, eye test, driving test that included backing and then driving for about 25 minutes. Checked lights, horn, insurance, tires and registration. No other inspection. Required for motorhome of GvW + 26,000 pounds. DPS in general are not familiar with the license category.

[wolfe10]

Yes, the driver's license in Texas for a motorhome over 26,000 pounds is a CLASS B EXEMPT.


It is NOT a CDL.


But many of the questions on the written portion of the test are the same as for a CDL.

[scottv11]

Back to the air issue. The DOT says there is an 'acceptable" loss rate for the air system. I dont remember what it is .If it really bothers you do like the busses do add a 12V or 120v compressor to the system. You will hear it run occasionally but it will keep the air up.

[smkymtnboy]

Originally Posted by scottv11

Back to the air issue. The DOT says there is an 'acceptable" loss rate for the air system. I dont remember what it is .If it really bothers you do like the busses do add a 12V or 120v compressor to the system. You will hear it run occasionally but it will keep the air up.

the air pressure drop rate is 2lb per minute or 4lb per combination vehicle.