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Slow air
92 seated coach conversion and recently I noticed that when parking or hooking up trailer, using the brakes quite often will cause the air to go below safe levels on one gauge only! It goes back up but very very slowly! Any ideas? There are two air level gauges in the dash. One on the left stays full 100% of the time, one on right is the one that goes down when applying brakes AND this same gauge is the one that empties after being parked overnight! It takes about 15-20 minutes to fully air up!
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1 Reply
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Ace,
Your air systems should not leak down. I know I just described Utopia but when our coaches are right the 2 brake systems and the aux air systems don’t leak.
Our brake systems especially should not leak down when the bus is parked because there is no air pressure to the brake chambers.
Your description does confuse me and there may actually be two issues. Run a standard DOT brake check and if the air pressure goes down with the release of the parking brake, or the steady application of the service brake you have a likely faulty brake chamber diaphragm. That is not uncommon and if your brake chambers are old you may just be ready for new chambers all around. Another issue could be a failed or failing hose. I suspect if you do the DOT brake check and do find a leak you are going to have to either cage an emergency brake or cap a service brake line and carefully get to a service shop if you do not do your own brake work. I can post a lot of photos and walk you through things if needed. DO NOT GET UNDER YOUR COACH UNLESS YOU HAVE IT SUPPORTED. Sorry to shout but that needs to always be said.
But since you say it leaks down over night the problem may also be elsewhere in the brake system. There are too many places to generalize, and it just takes some detective work and soapy water. Sorry for the late response. I missed your post this morning.
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