Zerk fittings what is the size of the zerk fittings for the fromt wheels?

There may not be any. Most manufacturers are putting 'permanently lubricated' joints in the front suspension for upper and lower ball joints, tie rod ends, and control arms. Also for universal joints in the drive shaft(s). If you have had replacements for any of these components, they may have a zerk fitting, and it will be located right on the joint being lubricated.

On most newer cars there are no zerk fittings.

If you get a grinding sound from the bearing when the wheel is off the ground and spinning the you DO NOT grease it...there is no zerk (grease fitting), You have a bad wheel bearing and you must either change the bearing or change the entire wheel hub assembly. Good luck.

Zerk, zerk, not zert...and anyway, grease fittings have zerks, and brake cylinders and brake calipers have bleed valves. Zerks let grease in and somewhat restrict outward flow, while bleed valves let fluid out when opened and totally stop anything in or out when closed. Just giving you a heads-up, Lloyd, when you explain this to a shop or mechanic, because a broken bleed valve usually requires getting a drill to it and drilling a small hole so an easy-out tool can fit inside the broken valve and wrench it out of there. If you have disc brakes there, the caliper may have it's bleed valve readily accessable to a drill. Any chance the broken part is loose? Does brake fluid escape there? A very slim chance you could get a tiny screwdriver on it and turn it back out of there, but they break off because tight to begin with and rust and road grit takes it's toll-it's a common problem. Good luck.

Unless the outer tie rods or lower ball joints have been replaced than there will not be any grease zerks. If the outer tie rods have been replaces the zerks will be on top. If the ball joints have been replaced the zerk will be on the side or the bottom.

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bleeding the brakes -
look fo the bleeder ( zerk fitting ) on the side of the caliper, attach a 1/4 inch clear hose to this fitting and run hose into a catch pan or bottle,, make sure you have plenty of brake fluid in the reservoir ( re-fill as needed during the bleeding process ), have a helper sit in the car and ready to press down the brake pedal, with brake pedal up - open the zerk fitting using a small wrench, have the helper press down and hold the brake pedal to the floor, with the pedal down - close the zerk fitting, your helper can now release the pedal, ( repeat this about 3 to 4 times or until clean and bubble free fluid flows through the clear hose ) --- top off the reservoir with fluid and repeat these steps for the other brake calipers. Note: if brake pedal feels sloppy ( not firm ) then there is still air in one of the lines,, continue bleeding until pedal feels like it has some resistance.

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first -- make sure that you have brake fluid in the reservoir,, and on the back of the brake drums you will see where the brake lines enter the drum itself,, near there you will see a little ' zerk ' fitting -- to this fitting you should place a clear hose over this fitting and run it into a catch bottle,, now with the help of a buddy ( or wife ) -- have them sit in the car and get ready,, now you need to take a small wrench and turn ( counter clockwise ) the zerk fitting ( just a little ) --- while it is open have your helper step on the brake pedal AND HOLD DOWN to the floor,, at this point you need to close the zerk fitting --- have them release the pedal,, open the zerk again and have them press and hold the pedal again,, close the zerk and release the pedal,, do this 3 to 4 times until NO air bubbles can be seen through the clear hose --- also check and refill the reservoir to make sure you don't run it dry.
repeat this process on the other side. after both brakes have been done, check the brake pedal,, when you push down it should get hard ( stiffer ) ( pump a few times ) --- if it goes to the floor then you still have air in the system and need to repeat the bleeding process.

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As far as the grease fittings are concerned, you should have between 2 to 6 fittings. 1 on each upper control arm, 1 on each tie rod, and possibly 2 on the center links. If you are hearing a rubbing noise, it could possible be the wheels rubbing on the inside of the wheel well. Alot of people like to put bigger tires on 4x4's to add give them extra clearance off the ground, specifically for off roading. But with the bigger tires could also come a wider tire, causing the rubbing. Have your tire dealer check for correct tire size.

Your vehicle most likely didn't come with any greaseale joints from the factory. However given the age, there could have been parts replaced that now have fittings. So, without looking at the vehicle it'd be impossible to tell which joints are greasable. But, the parts that could have a zerk fittings on your van include the outer tie rod ends, and lower ball joints. So just take a look and grease where appropriate.