Out of sight out of mind. Remember that old adage, well to help add miles or years to your vehicle's life it is essential to be remindful of all your components. Therefore I would like to point out a few of the simple and essential maintenance items.
Brake Caliper Slides: One of the most overlooked items on your vehicle. Proper maintenance of this simple component could be the solution to any of these brake symptoms; brake pull when not applying the brakes, brakes overheating prematurely or uneven brake wear. If the caliper slides are dirty, rusty or corroded they could cause the caliper to "hang-up". Your 4x4 Quigley van could have either a round style covered with a rubber boot (late models) or steel covered rubber spring style, early models in particular Dana 60 with a single piston caliper.
1. Round Style: the caliper should move easily by hand left and right (in or out), if not
inspect the slide. Remove the slide and inspect. You can either clean or replace slides. To
clean slides either sand or polish them until they move freely left to right (in or out) by
hand when mounted. Cover the slides with a light coat of antiseize or lithium grease, DO
NOT apply too much. You do not want grease on your brakes. If the slide's boot is torn
then you might want to replace the slide because it is no longer protecting the slide from
the elements.
2. Steel Covered Rubber Spring Style: this type of slide mounts between two flat surfaces,
one on the caliper and the other on the caliper mount. As with the round style the caliper
should move easily left and right (or in and out) by hand when mounted. If not remove the
spring slide and inspect slide and both mounting surfaces. You can either clean or replace
slides and using either sandpaper or a file, remove all corrosion build-up on both flat
mounting surfaces. Clean surfaces until they are shiny new-like metal surface. Apply either a
light coat of antiseize or lithium grease to both mounting surfaces. If done correctly you
should be able to install spring slide with the palm of your hand and check that the caliper
moves easily left and right (or in and out).
Checking Fluids: Your OEM Owner’s Manual has instructions for when to check and change your fluids. For your 4x4 related fluids refer to this link for your Ford 4x4 Maintenance Schedule or GM 4x4 Maintenance Schedule.
1. Check Engine Oil: Simple enough, use your vehicle’s dipstick to verify a safe level of oil,
do not over fill. Follow your vehicle’s "Owner’s Manual" for maintenance schedule and proper
engine oil.
2. Transmission Fluid: Your automatic transmission will have a dipstick similar to your engine
oil. Dipstick has both a hot and cold level gauge, more accurate to check when fluid is hot.
Follow your "Owner’s Manual" for maintenance schedule and proper transmission fluid.
3. 
Transfer Case: your transfer case will have two plugs, the lowest plug to the ground is the drain plug and the highest plug is your fill plug. The GM requires an 18mm wrench or socket while the Ford uses a 10mm allen head. Check your fluid level by removing the FILL PLUG, fluid should trickle out of plug. Use automatic transmission fluid (ATF); refer to either the Quigley Ford 4x4 Maintenance Schedule or the Quigley GM 4x4 Maintenance Schedule . Choose correct style of Quigley 4x4 system when referring to maintenance schedules.
4. 
GM IFS Front Differential: again this component will have 2 plugs, the lowest towards the ground is the Drain Plug and the highest is the Fill Plug. The procedure to check your fluid level is the same as the transfer case, using a 15mm wrench or socket remove the Fill Plug, fluid should trickle out of plug. Use 80w-90 gear oil Fluid, refer to the Quigley GM 4x4 Maintenance Schedule.
5. 
Solid Axle Differential: with a 3/8 ratchet remove the fill plug. Fluid should trickle out of the plug opening. Use 80W-90 gear oil, refer the Quigley Ford 4x4 Maintenance Schedule.
6. Grease all "greasable" zerk components. Refer to the proper maintenance schedule.
7. All other fluids such as brake, coolant windshield washer, etc refer to your vehicle’s
OEM owner’s manual for proper fluid types and maintenance schedule.
We recommend before a long trip that you take the time to check ALL your fluids. You are looking for proper operating levels as well as condition of the fluids. You should be looking for burnt odor, excessively dark coloration or discoloration.