PeterG
Senior Member
I went to drop the lift axle on my 2007 Kenworth T800 today. With the parking brake off, and the truck in Drive, and my foot on the brake, when I activated the switch in the cab, the button would light up, but no air pressure. When I took my foot off the brake pedal, the air activated to the correct pressure and I could drive. Then when driving, every time I touched the brake pedal, the air pressure would go off, and I assume the axle would come up. Normally it would only come up by itself when putting the truck in reverse, or the parking brake. Any ideas?