I need to know the size of the bolts that hold on the brake caliper housing and the bolts that hold on the brake caliper

no i think their is just 2 bolts holding the caliper support housing ,the caliper on older cars often held on with either two bolts that hold it to teh support housing or their is two taper pieces between the housing and the caliper and you knock one out ,do not touch these shims as yet without a mechanic telling you whats whats as if you could post a pic then i could tell you but please remember these cars are not sold here in europe but the scorpio and mondeo are and it could be teh same but without seing one?? i just do not know

For front brake pads replacement you need only usually wrench set, inclusive 7 mm allen key also. But for rear brake pads replacement you need obligatory a special caliper piston pressing tool, in order to press back rear caliper piston with parking brake automatic adjustment!!!
For front brake pads. First you must verify yours front brake disc diameter: 280 mm or 288 mm. After that you can buy the brake pads (with wear sensor). For change front brake pads you must raise vehicle, remove wheels, extract the retaining spring of the caliper, and remove the caliper as follow:
1. Do not disconnect the brake hose from the caliper, and do not allow the caliper to hang by the brake hose!
2. Remove top and bottom caps (on back side of the caliper) for access to guide pins, then unbolt and remove them from the brake carrier. Remove the caliper.
3. Now you must thoroughly clean the brake calipers (free of grease).
4. Remove outer brake pad from brake carrier.
5. Pull inner brake pad out of brake caliper piston.
6. Check up the brake fluid level on the reservor, and emptying if neccessary!
7. Push piston back into brake caliper housing.
8. Install inner brake pad (with expanding spring) in brake caliper piston. (Arrow marked on pad - if exist, must point in direction of brake disc rotation when vehicle is moving forward).
9. Install outer brake pad into brake carrier.
10. Bolt brake caliper housing to brake carrier using two guide pins. Tightening torque is 25 Nm.
11. Install both caps.
12. Insert retaining spring into brake caliper housing. Important: Depress the brake pedal firmly several times while the car is stationary so that the brake pads adjust to their normal operating positions!!! Check brake fluid level and top up if neccessary!!!

im seeing 13 mm to be the size for those bolts but i would bring a 14mm 15mm 17mm 19mm socket/wrench as well. goodluck

For front brake pads replacement you need only usually wrench set, inclusive 7 mm allen key also. But for rear brake pads replacement you need obligatory a special caliper piston pressing tool, in order to press back rear caliper piston with parking brake automatic adjustment!!! For front brake pads. First you must verify yours front brake disc diameter: 280 mm or 288 mm. (On my car y have 288 mm). After that you can buy the brake pads (with wear sensor). For change front brake pads you must raise vehicle, remove wheels, extract the retaining spring of the caliper, and remove the caliper as follow:
1. Do not disconnect the brake hose from the caliper, and do not allow the caliper to hang by the brake hose!
2. Remove top and bottom caps (on back side of the caliper) for access to guide pins, then unbolt and remove them from the brake carrier. Remove the caliper.
3. Now you must thoroughly clean the brake calipers (free of grease).
4. Remove outer brake pad from brake carrier.
5. Pull inner brake pad out of brake caliper piston.
6. Check up the brake fluid level on the reservor, and emptying if neccessary!
7. Push piston back into brake caliper housing.
8. Install inner brake pad (with expanding spring) in brake caliper piston. (Arrow marked on pad - if exist, must point in direction of brake disc rotation when vehicle is moving forward).
9. Install outer brake pad into brake carrier.
10. Bolt brake caliper housing to brake carrier using two guide pins. Tightening torque is 25 Nm.
11. Install both caps.
12. Insert retaining spring into brake caliper housing. Important: Depress the brake pedal firmly several times while the car is stationary so that the brake pads adjust to their normal operating positions!!! Check brake fluid level and top up if neccessary!!!

Make sure the emergency brake isn't on, the 2 bolts that hold the caliper itself are long with only threads near the top, the other 2 bolts hold the thing on the hub to stop the caliper from going around with the brakes. You should only be taking off the caliper bolts, the caliper slides back and forth on these when you hit the brakes. Pull the bolts and the caliper and pads should pop right out, with the squealers and shims. Hope this helps.

remove the BOTTOM 15mm caliper bolt lift the caliper up and slide off
then remover the 2 15mm bolts holding the caliper housing on
remove the brake rotor (you may have to hit it with a hamer to break it free
depending on the brake pads you got some come with new sliders
remove the sliders clean the rust build up then install new sliders
lube the sliders install the pads
install new rotor
install the caliper housing with the 2 15mm bolts
install the caliper and lube both caliper pins with silicone lube
install wheels
PUMP THE BRAKE PEDAL TILL IT GETS HARD WITHOUT ENGINE RUNNING

For a wrench or for the acctual bolt size.
To remove front pads..you need 8mm allen socket to pull the caliper guide pins, then 17 or 18mm..To remove rear pads...you need 13mm socket for lock bolt on guide pins and 15mm open end wrench (thin section to hold guide pin while you remove lock bolts..I ground down a spare wrench). You DO NOT have to remove rear carriers to change rotors..just remove lock screw and angle rotor out. The B5 Passats don't have the electronic parking brake so you don't need VAG Com to change pads.
Installation tips:
Clean and regrease the guide pins with "synthetic caliper grease"
Rear lock bolts come with preapplied thread locker and "are not to be reused"..I just wire brush the threads and use some Loctite Blue on em. I smear just a little antisieze on the inside bore of the rotors and on the lock screw threads to prevent corrosion and make next rotor change ez. Torques:
Front caliper guide pins:18 ft lb
Front carrier bolts: 89 ft lb
Rear guide pin lock bolts:26 ft lb
Wheel lugs: 89 ft lb

take a pair of pliers and hold the inter side of the guide and turn the bolt. the bolts is only 8mm w x 25mm L. this will allow you to remove the calipers.

If you can't see diagrams(sometimes happens) let me know and I will get them to you

1. Raise and support the vehicle. Remove the rear wheels.
2. If equipped, disconnect the brake pad wear sensor from the harness.
3. Counterhold the lower sliding pin using a thin open-end wrench and remove the caliper-to-sliding pin hex bolt.
4. Pivot the caliper upward or if necessary remove the upper caliper-to-sliding pin hex bolt.
5. Using a brake caliper retraction tool, select the appropriate sized piston press arbor and install the tool onto the brake caliper. Following the tool manufacturer's recommendations, use the tool to rotate the caliper piston clockwise as it is pressed into the brake caliper housing, until it is fully retracted.

Use a thin open-end wrench to . . . . . . support the caliper sliding pin when removing the caliper mounting bolt Use a disc brake caliper piston retracting tool that will rotate the caliper piston as it is pressed into the caliper The rear caliper piston is slotted to allow a retracting tool to rotate the piston when replacing the brake padsTo install:

1. Clean the brake caliper and all sliding surfaces. With the caliper piston pressed fully back into the caliper housing, check for leaking fluid and damaged dust boots.
2. If equipped, install a new brake pad wear sensor in the pad if the plastic part has been worn through on the old sensor. New sensors are not required unless the wire inside the plastic part has been exposed.
3. Lubricate the slider bolts with approved brake grease.
4. Install the brake pads onto the bracket assembly, and then carefully lower the caliper over the caliper mount. Check and make sure that the pad springs are correctly seated.
5. Replace all removed caliper-to-sliding pin bolts and torque to:
6. 1990-97 Passat models: 25 ft. lbs. (35 Nm)
7. 1998-00 Passat models: 22 ft. lbs. (30 Nm)
8. If equipped, connect the brake wear sensor wire to the harness. Check for a good connection as most problems with the sensor circuit are caused by faulty connections. Check that the wire is held by the loop in the dust cover and the connector is held at the clips.
9. Install the wheels and hand tighten the lug bolts. Lower the vehicle carefully until the tires begin to contact the surface and torque the lug bolts to specification in a crisscross pattern to:
10. M12 x 1.5 lug bolts: 81 ft. lbs. (110 Nm)
11. M14 x 1.5 lug bolts: 89 ft. lbs. (120 Nm)

Feel free to contact if you have any questions

no 10mm or 12mm you will also need a ebrake caliper reset tool