2004 maxima brake caliper pin with rubber sleeve

the calipers are in two sections
one section bolts onto the stub axle with 2 bolts and at the top of that section will be 2 bolts ( shafts) that are bolted to that mounting bracket
those bolts allow the caliper to slide so that the caliper can self center for equal pressure on each disc pad
there is normally a small rubber seal ( accordion shape) between the caliper body and the mounting bracket to keep dirt and water out but these fail and the slide section rusts onto the shafts
removing those bolts will be difficult as they will be rusted the full length of the slide but if you want the brakes to work properly it has to be done

top pins

If this is a Pin Slider, here is 1996 steps:

Section 06-03: Brakes, Front Disc 1996 F-150, F-250, F-350 4x2, 4x4, Bronco and F-Super Duty Vehicles Workshop Manual
REMOVAL AND INSTALLATION Caliper
Heavy-Duty Rail Slider, F-Super Duty
Replace brake shoe and lining (2001) as follows when the lining is worn to a minimum thickness of 0.794mm (1/32 inch) above the front disc brake rotor shield. CAUTION: Always replace all brake shoes and linings on an axle. Never replace only one wheel (1007).
Removal

1. To avoid fluid overflow when the caliper pistons are pressed into the caliper cylinder bores, siphon or dip part of the brake fluid out of the brake master cylinder reservoir (2K478). Discard the removed fluid.
   

1. Raise the vehicle and install safety stands. Remove the front wheel and tire assembly.
   

1. Place an appropriate size C-clamp on the disc brake caliper with end of clamp against caliper and end of screw against outer shoe. Tighten the clamp to bottom the caliper pistons in the cylinder bores. Remove the clamp. Do not use a screwdriver or similar tool to pry caliper pistons (2196) away from the front disc brake rotor (1125).
   
   
   
   
   

1. Clean excess dirt from area around pin tabs.
   

1. Tap upper caliper pin toward inboard side until pin tabs touch the front wheel spindle.
   

1. Using Hydraulic Caliper Pin Remover D89T-2196-A or equivalent and a light hammer, drive the pin from the disc brake caliper as follows:
   
   1. Position the notched end of the tool against the caliper pin (retention tab half), at a 45-degree angle from the pin retention tabs.
      
      
      
      
   1. Tap the tool with the hammer to compress the retention tabs.
      
      
      
      
   1. As the retention tabs are compressed, move the tool to gain a straight approach to the caliper pin, and continue tapping to drive the caliper pin through the caliper/spindle groove.

1. Repeat removal procedure for lower caliper pin.
   

1. CAUTION: Do not let the disc brake caliper hang by the front brake hose (2078). The front brake hose could become stretched or twisted which can cause the front brake hose to leak and rupture, resulting in failure.
   Remove the disc brake caliper from the front disc brake rotor. If the disc brake caliper is to be removed for service, remove the front brake hose from the disc brake caliper. Plug the end of the front brake hose to prevent fluid loss and entry of air into the system. If the disc brake caliper is not to be removed, wire it up to the frame of the vehicle to avoid damage to the front brake hose.
   

Installation
CAUTION: Always replace all brake shoes and linings on an axle. Never replace only one wheel.

1. NOTE: There is a raised section at one end of each shoe so installation can be made in one direction only.
   
   Install new inner and outer lining.
   

1. Lubricate the knuckle upper and lower inner pad grooves and caliper grooves with Disc Brake Caliper Slide Grease, Silicone Dielectric Compound D7AZ-19A331-A or equivalent meeting Ford specification ESE-M1C171-A. Install the disc brake caliper on a front wheel spindle, making sure the mounting surfaces are free of dirt.
   

1. CAUTION: Do not allow the tabs of the caliper pin to be tapped too far into the spindle groove. If this happens it will be necessary to tap the other end of the caliper pin until the tabs snap into place. The tabs on each end of the caliper pin must be free to catch on the spindle flanks.
   Position caliper pin with the pin retention tabs oriented adjacent to the spindle groove.
   

1. Tap the caliper pin on the outboard end with a hammer. Continue tapping the caliper pin inward until the retention tabs on the sides of the caliper pin contact the spindle face. Repeat procedure for the lower caliper pin.
   
   
   

I believe that the rear discs are warped or the tires are out of round when braking. More likely, the discs. --- The following are the instructions for replacing the front and rear pads for the front/back rotors. 1999-01 Grand Cherokee Front

1. Drain 2?3 of the brake fluid from the front reservoir. Use the bleeder screw at the front outlet port to drain the fluid. If equipped with anti-lock brakes, relieve the system pressure.
2. Raise and safely support the vehicle.
3. Remove the wheels.
4. Insert a small prybar through the caliper opening and pry the caliper (using the outboard brake pad) to bottom the pistons in the caliper bore. NOTE: This will back the brake pads off of the rotor surface to facilitate the removal and installation of the caliper assembly.
   
5. Pry the caliper support spring out of the caliper.
6. Remove both caliper slide pin bushing caps and slide pins.
7. Lift the caliper from the anchor.
8. Using a piece of mechanics wire, support the caliper so there is not tension on the brake hose.
9. Remove the brake pads from the caliper. Fig. 2: Installing the inward brake pad on the front caliper pistons - 1999-01 Grand Cherokee
   To install:
   
10. Position the brake pads onto the caliper.
11. Position the caliper into place on the anchor.
12. Coat the caliper slide pins with silicone grease and torque them to 21-30 ft. lbs. (29-41 Nm). Install the slide pin bushing caps.
13. Install the caliper support spring in the top of the caliper under the anchor; then, install the other end into the lower caliper hole. NOTE: Hold the spring in the caliper hole with your thumb while prying the spring end out and under the anchor.
    
14. Fill the master cylinder with fluid and bleed the brake system.
15. Before driving the vehicle, pump the brakes several times to seat the pads.
16. Install the wheels.

Rear

1. Drain 2?3 of the brake fluid from the front reservoir. Use the bleeder screw at the front outlet port to drain the fluid. If equipped with anti-lock brakes, relieve the system pressure.
2. Raise and safely support the vehicle.
3. Remove the wheels.
4. Insert a small prybar through the caliper opening and pry the caliper (using the outboard brake pad) to bottom the piston in the caliper bore. NOTE: This will back the brake pads off of the rotor surface to facilitate the removal and installation of the caliper assembly.
   
5. Pry the caliper support spring out of the caliper.
6. Remove both caliper slide pin bushing caps and slide pins.
7. Lift the caliper from the anchor.
8. Using a piece of mechanics wire, support the caliper so there is not tension on the brake hose.
9. Remove the brake pads from the caliper. Fig. 3: Installing the inward brake pad on the rear caliper piston - 1999-01 Grand Cherokee
   To install:
   
10. Position the brake pads onto the caliper.
11. Position the caliper into place on the anchor.
12. Coat the caliper slide pins with silicone grease and torque them to 21-30 ft. lbs. (29-41 Nm). Install the slide pin bushing caps.
13. Install the caliper support spring in the top of the caliper under the anchor; then, install the other end into the lower caliper hole. NOTE: Hold the spring in the caliper hole with your thumb while prying the spring end out and under the anchor.
    
14. Fill the master cylinder with fluid and bleed the brake system.
15. Before driving the vehicle, pump the brakes several times to seat the pads.
16. Install the wheels.

1. Raise and safely support the vehicle.
2. Matchmark the relationship of the wheel to the axle flange. Remove the wheel and tire assembly.
3. Reinstall two lug nuts to retain the rotor.
4. If the caliper is being removed from the vehicle for replacement or overhaul, perform the following:
   • Disconnect the brake hose from the caliper. Plug the opening in the caliper and the brake hose to prevent fluid loss and system contamination.
   • Detach the parking brake cable by lifting up on one end of the cable spring clip to free the end of the cable from the lever.
5. Remove the bolt and washer attaching the cable support brake to the caliper body assembly.
6. Remove the sleeve bolt, then remove the caliper body assembly. Pivot the caliper body up to clear the rotor and then slide it inboard off the pin sleeve.
7. If the caliper is being removed for shoe and lining replacement or to provide access to the support bracket, rotor of wheel brake components, hang the caliper from suspension using a suitable wire hook so as not to stretch or damage the brake hose or brake cable.
8. Inspect the pin boot, bolt boot and sleeve for cuts, tears or deterioration. If damaged, replace the boots.

To Install:

1. Install the caliper assembly, as follows:
   • If not replaced, remove the pin boot from the caliper body assembly and install the small end over the pint sleeve (installed on the caliper support) until the boot seats in the pin groove. This is to prevent cutting the pin boot when the sliding body assembly onto the pin sleeve.
   • Hold the caliper body assembly in position it was removed and start over the end of the pin sleeve. As the caliper body assembly approaches the pin boot, work the large end of the pin boot in the caliper body groove. Then push the caliper body fully onto the pin.
   • Pivot the caliper body assembly down, using care not to damage the piston boot on the inboard shoe. Compress the sleeve boot by hand as the caliper body move into position to prevent boot damage.
   • After the caliper body assembly is in position, recheck the installation of the pad clips. If necessary, use a small prytool to re-seat or center the pad clips on the support abutments.
2. Install the sleeve bolt and tighten to 20 ft. lbs. (27 Nm).
3. Fasten the cable support bracket (with the cable attached) with the retaining bolts and washer. Tighten to 32 ft. lbs. (43 Nm).
4. If disconnected, attach the end of the parking brake cable to the parking brake lever by lifting up on the end of the cable spring clip and work the end of the parking brake cable into the notch in the lever.
5. Unplug and attach the brake hose, if it was disconnected.
6. Remove the two lug nuts retaining the rotor.
7. Install the wheel and tire assembly, aligning the marks made during removal.
8. Carefully lower the vehicle, then bleed the brake system if the brake hose was disconnected.
9. Firmly depress the brake pedal 3 times to seat the pads against the rotors.

put the rubber bushing on top

Top to keep it grease sealed.You never have to take that out if your changing pads.Only when you are changing the caliper

I just did the rear caliper on my '95 Deville Concours and found that the caliper would not rotate enough to slide it off the top bolt. My solution was to remove the parking brake cable bracket bolt behind the caliper. This gave me the ability to rotate the caliper enough to get the caliper off of the brake pads and slide the caliper towards the inside of the car.

You will have to take the wheel off, then try to use a latge screw driver to pry between the old pads and the rotor to push the old pads back some, this will allow you to remove the caliper easier later. Next get a T-45 socket and remove both the top and bottom bolts from the back of the caliper. Tilt the brake caliper at the top or the bottom (it different for both side), and slide it off. Then you can just remove the pads. Be careful to notice that the shims on the caliper slide are different from top to bottom, don't mix them up. Pull the caliper slide pins out and inspect the boot for hole or cracks and the pins for rust, replace if any of these condition exist. Use some brake silicone grease to lube the slide pins and put a little into each boot and put the slide pins back in. Check the rubber boots on the caliper pistions to make sure they are not leaking any fluid or ripped. Use one of the old brake pads and a C-clamp to push both pistons on one caliper back in until they are flush. Check to make sure that no fluid leaked out of the caliper pistons while they were being pushed back in. If you want to do what is call a pad slap only then you can install that pads at this time but that is not recommended. It is recommened that you measure, check and turn the rotors if at all possible or replace them, the wheel seals and check and repack the wheel bearings.

1. Remove the cover on the master cylinder and siphon enough fluid out of the reservoirs to bring the level to 2/3 full. This step prevents spilling fluid when the piston is pushed back.
2. Raise and support the vehicle. Remove the front wheels and tires.
3. Push the brake piston back into its bore using a C-clamp to pull the caliper outward.
4. Unfasten the brake hose fitting from the caliper using a flare nut wrench, cap the fitting to prevent foreign material from entering the or the hose.
5. Remove the two bolts which hold the caliper and then lift the caliper off the disc.

1. Remove the inboard and outboard shoe.

If the pads are to be reinstalled, mark them inside and outside.

1. Remove the pad support spring from the piston.
2. Remove the two sleeves from the inside ears of the caliper and the 4 rubber bushings from the grooves in the caliper ears.
3. Remove the caliper.
4. Check the inside of the caliper for fluid leakage; if so, the caliper should be overhauled.

To install:

1. Lubricate the sleeves, rubber bushings, bushing grooves, and the end of the mounting bolts using silicone lubricant.
2. Install new bushing in the caliper ears along with new sleeves. The sleeve should be replaced so that the end toward the shoe is flush with the machined surface of the ear.
3. Install the brake pads.
4. With the two pads in position, place the caliper over the brake disc and align the holes in the caliper with those of the mounting bracket.

1. Fill the cavity between the bolt bushings with silicone grease. Install the mounting bracket bolts through the sleeves in the inboard caliper ears and through the mounting bracket, making sure that the ends of the bolts pass under the retaining ears on the inboard pad.

For best results, always use new bushings, sleeves and bolt boots.

1. Tighten the mounting bolts to 35 ft. lbs. (47 Nm) for R/V Series; 28 ft. lbs. (38 Nm) for 1988-92 C/K Series and 38 ft. lbs. (51 Nm) for 1993-98 C/K Series.
2. Connect the brake hose to the caliper and tighten the fitting until the are snug.
3. Pump the brake pedal to seat the pad against the rotor. Don't do this unless both calipers are in place. Use a pair of channel lock pliers to bend over the upper ears of the outer pad so it isn't loose.

After tightening the mounting bolts, there must be clearance between the caliper and knuckle at both the upper and lower edge. On R/V Series, the clearance must be 0.010-0.024 in. (0.26-0.60mm); on C/K Series, it must be 0.005-0.012 in. (0.13-0.30mm) for 1988-91, and 0.010-0.028 in. (0.26-0.71mm) on 1992-98 models. If not, loosen the bolts and reposition the caliper.

1. Install the front wheel and lower the truck.
2. Add fluid to the master cylinder reservoirs so that they are 1/4 in. (6mm) from the top.
3. Bleed the brake system.
4. Check the fluid level again and add fluid as necessary. Do not move the vehicle until a hard pedal is obtained.