Why rear brakes squeal backing up on 2003 windstar ?

Have your rear brakes inspected for excessive wear and to make sure the E-Brake Cable is not broken.

Removal
1.Remove rear wheel and tire assembly from vehicle.

2.Remove rear brake drums from hub and bearing assemblies after loosening the two brake drum screws.

3.Be sure that the parking brake pedal is in the release(most upward) position.

4.Completely loosen square nut of the rear parking brake cable. Then create slack in the rear parking brake cables.

5.Remove adjuster spring from adjust lever and brake shoe.

6.Remove adjust lever and turn the adjusting wheel of adjuster assembly to the direction of the arrow as shown.

7.Remove the strut spring and the lower retracting spring from the brake shoe.

8.Remove the upper return spring from the brake shoe.

9.Remove brake back plate hold down spring and pin from the leading brake shoe assembly.

10.Remove the leading brake shoe. Then remove the adjuster assembly, strut and anchor spring from the trailing brake shoe.

11.Remove the trailing brake shoe from the brake back plate after removing hold down spring and pin.

12.Remove the trailing brake shoe from the rear parking cable.

13.Remove parking pivot lever from the leading brake shoe.

Replacement
1.Lubricate the eight shoe contact areas on the back plate and anchor.

2.Install the trailing brake shoe to the rear parking cable.

3.Install trailing brake shoe on brake back plate and install the trailing brake shoe hold down spring and pin on the brake shoe.

4.Tighten the square nut of rear parking cable.

5.Install the anchor spring then install adjuster assembly, and strut.

6.Install leading brake shoe on brake back plate.

7.Install the brake shoe upper return spring, strut spring and the lower retracting spring to the brake shoe.

8.Properly rotate the adjusting wheel of adjuster assembly to the direction of the arrow in as shown.

9.Install the adjuster spring on the adjust lever and leading brake shoe assembly.

10.Install the leading brake shoe hold down spring and pin on the brake shoe.

11.Adjust brake shoes assemblies so as not to interfere with brake drum installation.

12.Install the rear brake drums on the hubs.

13.Check and adjust whether the pedal stroke in the specification.(Refer to section BR Gr./On-vehicle service/Pedal stroke of parking brake)

14.Install wheel and tire.

15.Push the parking brake pedal to the floor once and release pedal. This will automatically remove the slack from and correctly adjust the parking brake cables.

16.Test the vehiche on the road. The adjust will continue the brake adjustment during the road test of vehicle.

Inspection
1.Inspect the disassembled parts for wear, rust or damage.

2.Measure the thickness of brake shoe lining.
Standard : 0.17 in (4.5 mm)
Minimum : 0.04 in (1 mm)

3.If the shoe lining is less than minimum or shows signs of uneven wear, replace new one.

4.Measure the inside diameter of the brake drum.
Standard : 10 in (254 mm)
Maximum : 10.07 in (256 mm)

5.If the inside diameter of the brake drum is more than maximum or shows signs of uneven wear, replace new one.

6.Inspect the lining and drum for proper contact. If the contact condition is improper, repair it with a grinder or replace the brake shoe assembly.

After you remove the tire, the drim should slide off. If it doesn't then try using a rubber mallet and gently tap on the outside edge as you pull on it. Sometimes you also need to tap on the drum in the center part. I have sprayed penetrating lubes like WD-40 or PB Blaster into the seam at the center. You may also have to back off the parking brake cable or even use the adjuster to back off the shoes.

REMOVAL & INSTALLATION
It is a good idea to only disassemble and assemble one side at a time, leaving the other side intact as a reference.

1. Raise and support the vehicle safely.
2. Remove the brake drum.
3. Disconnect the parking brake rear cable and conduit.
4. Remove the brake shoe hold-down springs and brake shoe hold-down pins.
5. Remove the brake shoe adjusting screw spring.
6. Remove the brake shoe adjusting lever and adjuster screw.
7. Remove the brake shoe retracting spring.
8. Remove the brake shoes from the backing plate.
9. Remove and discard the parking brake lever clip. Remove the washer.
10. Remove the parking brake lever from the rear brake shoe.

To install:

1. Thoroughly clean the backing plate with brake cleaning solvent and dry completely.
2. Use silicone grease to lubricate the brake backing plate-to-brake shoe contact areas.
3. Apply a light coating of premium grease to the threaded areas of the adjuster. Turn the adjuster in and out to spread the lubricant. Turn the adjuster all the way down on the screw and loosen one-half turn.
4. Install the parking brake lever to the rear (secondary) brake shoe with a new clip.
5. Position the brake shoes on the backing plate and install the brake shoe hold-down springs.
6. Attach the parking brake rear cable and conduit to the parking brake lever.
7. Attach the brake shoe retracting spring.

The socket end of the brake adjuster screw is stamped with "R" or "L" to indicate that it is to be installed either on the right (passenger's side) or left (driver's side) of the vehicle. The adjuster nuts can be distinguished by the number of grooves machined around the body of the nut. Two grooves indicate a right-hand adjuster nut and one groove indicates a left-hand adjuster nut. Another way to identify brake adjuster assemblies is to check thread pitch. The right side adjuster assembly has right-hand threads and the left side has left-hand threads. If installed correctly, the brake adjuster assembly will increase in length when the brake shoe adjusting lever is operated.

1. Install brake adjuster screw in the slots on the brake shoes. The wider slot on the socket end must fit in the slot on the front (primary) brake shoe.
2. Install the brake shoe adjusting lever on the lever pin.
3. Install the brake adjusting screw in the slot on the secondary brake shoe and in the slot on the brake shoe lever. The brake shoe adjusting lever should contact the brake adjuster screw.
4. Adjust the brake shoes.
5. Install the drums.

ADJUSTMENTS

The drum brakes are self-adjusting and require a manual adjustment only after the brake shoes have been replaced, or when the length of the adjusting screw has been changed while performing some other service operation.
Drum Installed

1. Raise and support the vehicle safely.
2. Remove the rubber plug from the adjusting slot on the backing plate.
3. Insert a Brake Adjustment Tool (D81L-1103-C) or equivalent into the slot and engage the lowest possible tooth on the starwheel. Move the end of the brake spoon downward to move the starwheel upward and expand the adjusting screw. Repeat this operation until the brakes lock the wheels.
4. Insert a small screwdriver or piece of firm wire (coat hanger wire) into the adjusting slot and push the automatic adjusting lever out and free of the starwheel on the adjusting screw and hold it there.
5. Engage the topmost tooth possible on the starwheel with the brake adjusting spoon. Move the end of the adjusting spoon upward to move the adjusting screw starwheel downward and contract the adjusting screw. Back off the adjusting screw starwheel until the wheel spins freely with a minimum of drag. Keep track of the number of turns that the starwheel is backed off, or the number of strokes taken with the brake adjusting spoon.
6. Repeat this operation for the other side. When backing off the brakes on the other side, the starwheel adjuster must be backed off the same number of turns to prevent side-to-side brake pull.
7. When the brakes are adjusted, make several stops while backing the vehicle to equalize the brakes on both of the wheels.
8. Lower the vehicle.

Drum Removed
See Figure 2

Fig. Fig. 2: When using a brake adjustment gauge, first measure the inside diameter of the drum (top) and then adjust the brakes shoes to the proper outside diameter (bottom)

1. Remove the brake drum.
2. Make sure that the shoe-to-contact pad areas are clean and properly lubricated.
3. Using a Brake Adjustment Gauge (D81L-1103-A) or equivalent, check the inside diameter of the drum.
4. Measure across the diameter of the assembled brake shoes, at their widest point.
5. Turn the adjusting screw so that the diameter of the shoes is 0.030 in. (0.76mm) less than the brake drum inner diameter.
6. Install the drum.

INSPECTION

See Figure 3

Fig. Fig. 3: Measure brake shoe thickness in several places around the shoe
Inspect the brake shoes for wear using a ruler or Vernier caliper. Compare measurements to the brake specifications chart. If the lining is thinner than specification or there is evidence of the lining being contaminated by brake fluid or oil, replace all brake pad assemblies (a complete axle set).

If the following is not enough then maybe try Alldata.com which generally has more information, but it will cost: REMOVAL & INSTALLATION Chrysler Concorde, New Yorker, LHS Dodge Intrepid Eagle Vision

1. Remove the rear wheels and brake drums.
2. Remove the dust cap from the rear hub and bearing assembly.
3. Remove the cotter pin, nut retainer and wave washer. Discard the old cotter pin.
4. Remove the rear hub and bearing assembly retainer nut and washer. Remove the rear hub and bearing assembly from the spindle.
5. Remove the automatic adjuster spring from the adjuster lever.
6. Rotate the automatic adjuster starwheel enough so both shoes move out far enough to be free of the wheel cylinder boots.
7. Disconnect the parking brake cable from the actuating lever. Disconnect parking brake cable one side at a time.
8. Remove the both lower brake shoe to anchor springs.
9. Remove the 2 brake shoe hold-down springs from the brake shoes.
10. Remove the brake shoes, upper shoe-to-shoe return spring, automatic adjuster and automatic adjuster lever from the backing plate as an assembly.
11. Separate the brake shoes from the automatic adjuster mechanism.
12. Remove the brake shoe automatic adjuster lever from the leading brake shoe. To install:
    
13. Thoroughly clean and dry the backing plate. To prepare the backing plate, lubricate the bosses, anchor pin and parking brake actuating lever pivot surface lightly with lithium based grease.
14. Remove, clean and dry all parts still on the old shoes. Lubricate the starwheel shaft threads with anti-seize lubricant.
15. Assemble both brake shoes, the top shoe to shoe return spring, automatic adjuster and automatic adjuster lever before mounting on vehicle. Make sure the ends of the automatic adjusters are positioned above the extruded pins in the webbing of the brake shoes prior to installation.
16. Install the brake shoe assembly onto the brake support plate and install the hold-down springs.
17. Install the lower anchor springs and reconnect the parking brake cable to the park brake lever of the trailing brake shoe.
18. Rotate the serrated adjuster nut to remove the free-play from the adjuster assembly.
19. Install the automatic adjuster lever spring on the lead brake shoe assembly and the automatic adjuster lever.
20. Install the rear hub and bearing assembly. Install washer and retainer nut and torque to 124 ft. lbs. (168 Nm).
21. Install the wave washer, nut retainer and a new cotter pin onto the spindle. Install dust cap.
22. Adjust brake shoes so not to interfere with brake drum installation. Install the rear brake drum. NOTE: After installing the brake drums, pump the brake pedal several times to partially adjust the brake shoes. To verify proper operation of the self-adjusting parking brake, be sure that both rear brakes are not dragging when the parking brake pedal is released.
    
23. Install the rear wheels and lug nuts. Torque the lug nuts, in a star pattern sequence, to 95 ft. lbs. (129 Nm).
24. Road test the vehicle. The automatic adjusters will continue brake adjustment during the road test of the vehicle.

Type of brake shoes there using, the more metallic compound on the shoe will make them Squeal and just takes time for the brake shoes and drums to wear there self to a point where they will not squeal any more. The high Metallic brake shoes will last longer but make more noise, I did a break up grade on my Jimmy with ceramic brake pads and vented rotors. At first before there were broken in, stopping distance was bad and brakes was loud, but now it's like dropping an anchor LOL. Keep me posted and give it a few miles of stop and go traffic.

does it have rear disc brakes or drum brakes, if disc brakes should be changed just like the front and you might have an emergency brake shoe inside the rotor that they call a halo shoe, if it is drum brakes take off the adjusting spring and the return spring remove the brake adjuster,the the brake bar then remove the brake shoe hold down spring by holding the pin from the back and pushing and turning the spring to remove from the pin, you might have to remove the the emergency brake bar from one shoe by removing the horseshoe clip from the pin on the shoe if you have problems putting it back together look at the other side that you have not torn down yet.

Either dirty,glazed or leak wheel cylinders,note some aftermarket pads or shoes will do this.

relase your hand brake also loose the brake adjustment to get gap between the darum and shoes.