All ActivityMost RecentMost LikesSolutionsRe: Breakdown InformationRV particulars:1999 Gulf Stream Sun Voyager Bus Driveline (Engine, Transmission): Cummins/Allison Miles:47633 Year:1999 Break Down Description: No Air pressure above 50 lbs Symptoms: Started RV after stopping for lunch at a rest area, just west of OKC on I40. Killed coach and started generator. Ate lunch then wen to start coach back up to continue journey. Would not build up air pressure. Effect: Would not build up air pressure so could not release parking brake. Cause: 2 rather large air leaks. Outcome: Called GS roadside and they sent out a mechanic (who was super, by the way). Drained front tank, replaced governor on compressor and bypassed air dryer. Almost immediately built up to 125 psi in both tanks. This was my first trip in the RV (except for 2 short 100 milers). Was on my way to St. Louis. Had already worked on the air dryer. Worked perfectly the rest of the trip. I have past experience with diesels (buses), so know about keeping the moisture out of the tanks.Re: What is your average freeway/highway speed?Just got back from my first "long" trip in my 99 Gulf Stream DP. I44 speed limit was 75, but that was not comfortable for me in the Oklahoma wind, so 65-70.