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Message: [QUOTE="Lassie, post: 532321, member: 8250"] You'll need a vaccuum gauge/brake bleed kit (thats usually how they are sold) It will have different fittings and tubing sizes with it. On passenger side wall under the hood, directly behind the battery, is the pulse vaccuum solenoid, vaccuum pump, and vaccuum canister. This procedure looks long, but will take all of about 10 minutes to diagnose your problem. 1. With Key on Engine Off (KOEO), the vaccuum pump should run until canister builds vaccuum. Connect vac tester into line between pump and canister to be used as a gauge. 2. Cycle ket off and on and listen for pump to run. Watch gauge and vaccuum should build and pump shut off. Vaccuum should now hold. If all this checks out, pump is good. 3. Reconnect line from pump to canister. 4. Connect the vac gauge into line going from canister to pvh solenoid mounted on side wall. 5.Cycle the key as before. Vaccuum pump should build vaccuum in canister and hold. If does not hold, leak is in canister. 6.Reconnect line from canister to pvh solenoid. 7. Connect gauge to pvh solenoid output. 8. Cycle key to rebuild vaccuum. 9. Switch ESOF switch on dash to 4wd. Vaccuum at output of pvh solenoid should now read about 15 in. If it spikes to some vaccuum and bleeds down, or doesnt show vaccuum, change the solenoid valve. 10. Reconnect line to pvh solenoid. 11. The output line of the pvh solenoid turns down towards the passenger side wheel and splits to both hubs. Inside each wheel well is a tee fitting which is the easiest place to test. 12. Plug one of these tees with a golf tee or some other plug. 13. Place gauge into the other tee reading back to the solenoid. 14.Cycle key to build vaccuum. 15. Turn dash switch to 4wd again and check vaccuum gauge. This checks the lines from the solenoid down to each tee. 16. If no leak is found, use the vaccuum tester to pull 15 in of vaccuum on each hub. Do this from the same wheel well tee connection. If leaking here, check line. If line is good, change the three hub seals. If you find a hub leak, I'll give you some more. [/QUOTE]