Possibly the pressure relief valve in the pump is stuck? Have you disconnected the air line and then drove to see if it would unlock? The unlock position is spring loaded so it should unlock itself with no air pressure applied. Report back.

Last edited by justice; 05/29/12 12:50 AM.
99 Gen 2.5, fixing blown head gasket
89 SWB- 33's, ARB Front locker, SR rear locker/axle, SR F brakes, winch, WST Offroad Armor all Around, 2.85 Aussie T-case Gears (SOLD)
Sold: (2) 95 SR's, 86 SWB, 90LWB, 91 LWB
-Can Change a timing belt in my sleep..