New MH airbag operation

RWjSIM2003 wrote:

Took the MH camping this weekend started MH let airbags inflate and raised jacks. Went to release the parking brake and air pressure dropped to 85 with foot on brake the bags were slow to get back to 120psi. I am surprised that every time I release the break that I lose air.

Am I doing something wrong? How do you operate the airbags on your coach?

The air brakes and the suspension air bags are not related to each other, other than they both operate off of air pressure. When you use the air brakes, they are NOT taking air from the suspension air bags. There are separate air tanks that supply air for the brakes.

When you use the brakes, air has left the brake air tanks via the brake peddle you're pushing. This activates the brakes. When you take your foot off of the brake peddle, the air can't go back into the tank, it's discharged out into the atmosphere.

The MH air compressor will continue to put out air. If the brake air tank is below it's maximum pressure limit, the compressor will refill the brake air tank back up to its max air pressure setting. If the tank is up to its max pressure, the air system will dispose of the excess pressure into the atmosphere. You will hear the air system discharging the excess air pressure every couple of minutes. You'll year a loud PISHHHHH.

As others have said, the air bag control switch will lower or bleed the air pressure out of the air bags when its in the lower position. When you flip it to auto, the air system inflates the suspension air bags "automatically" to the correct air pressure. Auto does not mean that it is automatically raising and lowering or increasing and decreasing the air pressure in the suspension air bags.

I have an Excursion which is the same as a Discovery.

Bill