Originally Posted by frank1
I haven't used my 99 gulfstream DP for about 18 months, been parked outside by my garage. I started it up today and the air brake pressure took forever to build up, like 20 minutes or longer, with engine above 1500 rpm. Once it did and I bleed it down, using the brake peddle, it took a long time to rebuild pressure again. It un-loads at about 125 lbs. What/where can I start to look first to find out why this is happing. Thanks.
First place to look is replace the air governor. It should be located right near the compressor on the motor. I've had one go out and now, always carry a spare. They cost less than $30.00. From your description, I suspect you'll have to get a rebuilt compressor installed.
I did have an air compressor that failed when we were on our trip around Alaska and had to have it replaced in Fairbanks. Tried all the other suggestions that have been made and none worked. Compressor was replaced with a rebuilt one that had to be flown up from Spokane and problem solved. My compressor failure was the same as you describe.