Front wheel bearings were installed too tight, the wheel has zero play and the brake caliper will not release properly

Sounds like a caliper issue- it could be stuck or the guides are in bad shape keeping it from releasing properly. You may need to remove the caliper and inspect for proper movement, including the piston.

you probably have a seized wheel bearing/hub assembly or frozen brake caliper - you can remove the wheel hub/bearing assembly yourself in about an hour with common hand tools (an impact wrench will really speed this up) - you can rent the wheel nut removal socket at most auto parts stores - you will have to have an automotive shop with a bearing press to remove and replace the wheel bearing ($30-$60) - if the caliper is seized - replace the entire assembly (and probably the ruined brake rotors and pads)

Remove offending wheel and set park brake extremely tight. Remove brake pads from caliper, and then unbolt caliper. Release the park brake. Unbolt the heater supply tube. Remove six 8mm hex bolts on the CV joint near the transmission. Remove axle. Remove four bolts on outside of housing that hold the 2 bearing race retainers. Reinstall new bearing into the housing... again this will require the EBS tool, and of course you'll have to rearrange the parts of the tool. Once the new bearing is installed, reinstall the bearing race retainers and the four screws that hold the retainers. Carefully reinstall the axle, making sure not to push the hub out of the bearing again.Reinstall six 8mm hex bolts holding the CV joint to the transmission. Reinstall rotor then set parking brake extremely tight.Reinstall brake caliper andl brake pads. Reinstall heater supply tube and wheel, torque wheel bolts to 96 ft-lbs, re-install transmission cover and suspension cover. Here you can find the quality parts http://www.carpartswarehouse.com/part/wheel-hub-bearing.html

remove tire
remove axle nut
remove 3 bolts holding hub in
sometimes may need to hit hub with hammer after all bolts out to get it to release

Rear disc brake pads offer better performance and are not as affected by moisture like conventional brake shoe style brakes are. Rear disc brakes are similar to front disc brakes. The main difference is that rear disc brake systems must incorporate the emergency brake system. There are two methods widely used for the emergency brake with rear disc systems. The first system is a brake shoe inside the brake disc that is actuated by the emergency brake lever. The second is a screw style actuator inside the brake caliper. When activated the brake pads are forced into the brake disc and held tightly by the emergency brake lever.
READ COMPLETELY BEFORE STARTING
Step 1 - Identify Rear Disc Brake Components
Rear disc brake assembly includes; rear brake disc, rear brake pads, brake caliper mount and a caliper mounting screw. (Note: Some vehicles do not have the rotor mounting screw.)
Step 2 - Removing the Rear Brake Caliper Mount Bolts
To replace rear brake pads and rotors the rear brake caliper needs to be removed. First loosen the rear brake caliper mount bolts and remove them. Turn counter clockwise.
Step 3 - Lift Rear Brake Caliper from The Caliper Mount
After the caliper mount bolts have been removed, gently lift the brake caliper from the caliper mount. Inspect the caliper slides; they should move freely in the caliper mount. Remove rear brake pads and hardware.

Step 4 - Removing Caliper Mount Bolts
With a socket wrench or other appropriate removal tool, loosen the rear brake caliper mounting bolts. Remove bolts and lift the caliper mount and remove it from the vehicle. Remove the retaining screw from the disc mounting hole. Tap the rotor gently to release any rust that has accumulated between the rotor and bearing hub. Lift brake rotor from wheel hub holding on tightly, using both hands. You do not want to drop the rotor.

Step 5 - Removing Rear Brake Rotor
Remove the retaining screw from the disc mounting hole, tap the rotor gently to release any rust that has accumulated between the rotor and bearing hub. Lift brake rotor from wheel hub, hold on using both hands and do not drop.

Step 6 - Install New Brake Rotor
Check the new rotor against the old brake rotor to make sure they are the same size. Clean the mating surface on the wheel hub before the new brake rotor is installed. Reinstall rotor retainer screw.
Step 7 - Reset Rear Brake Caliper
Before new brake pads can be installed, the rear brake caliper must be reset. The reset tool winds the piston back into position so the new brake pads will fit. This style of brake caliper will not compress with a clamp tool; it can only be reset with the proper reset tool.
Step 8 - Reinstall Rear Caliper Mount and Install New Rear Brake Pads
After the caliper has been reset, reinstall caliper mounting bolts and make sure the bolts are tight. Then match up the old brake pads to the new brake pads. They should be exactly the same except, of course; the old ones will be worn out. Check the new brake pads for proper fit and install any brake hardware that is required.
Step 9 - Remount Rear Brake Caliper
Reinstall the brake caliper, align brake pad hardware and reinstall caliper mounting bolts. (Note: align the rear peg of the brake pad to the groove in the caliper piston.) Recheck and retighten all caliper and caliper mount bolts. Bleed brake system to relieve any air in the system. Before driving the vehicle, push the brake pedal down and let it up slowly. This operation forces the brake pads to travel to the brake rotors. DO NOT DRIVE VEHICLE until proper brake pedal operation resumes. When test driving vehicle listen for any unusual noises during the operation of the brakes.
WARNING! Always have the vehicle under inspection on level ground, in park with the emergency brake on. Always wear protective eyewear, gloves and necessary clothing before inspection or work begins. Never crank an engine over when anyone is near the battery or engine. Always have an operational fire extinguisher close by, obey all first aid instructions in the event of an injury. Never stand in front or behind a vehicle when cranked over or running. When engine is cranked over keep hands and clothing away from rotating components. Never move a car without proper brake pedal operation.

NOTE: After the wheel bearings have been removed or replaced or the front axle has been reassembled be sure to adjust wheel bearing preload. Refer to the Adjustment service procedure below. On the 1989–92 240SX there is just one wheel bearing, pressed into the hub and no adjusting cap. Refer to the exploded views of the Front Axle Hub Assembly. Review the complete service procedure.

1. Raise and support the vehicle safely.
2. Remove the front wheels and the brake caliper assemblies. NOTE: Brake hoses do not need to be disconnected from the brake caliper assemblies. Make sure the brake hoses are secure and do not let caliper assemblies hang unsupported from the vehicle.
   
3. Work off center hub cap by using thin tool. If necessary tap around it with a soft hammer while removing.
4. Pry off cotter pin and take out adjusting cap and wheel bearing lock nut.
5. Remove wheel hub with disc brake rotor from spindle with bearings installed. Remove the outer bearing from the hub.
6. Remove inner bearing and grease seal from hub using long brass drift pin or equivalent.
7. If it is necessary to replace the bearing outer races, drive them out of the hub with a brass drift pin and mallet.
8. Install the outer bearing race with a tool (KV401021S0 special tool number) until it seats in the hub flush. NOTE: Place a large glob of grease into the palm of one hand and push the bearing through it with a sliding motion. The grease must be forced through the side of the bearing and in between each roller. Continue until the grease begins to ooze out the other side through the gaps between the rollers. The bearing must be completely packed with grease.
   
9. Pack each wheel bearing with high temperature wheel bearing grease. Pack hub and hub cap with the recommended wheel bearing grease up to shaded portions. Refer to the illustration.
10. Install the inner bearing and grease seal in the proper position in the hub.
11. Install the wheel hub with disc brake rotor to the spindle.
12. Install the outer wheel bearing, lock washer, wheel bearing lock nut, adjusting cap, cotter pin (always use a new cotter pin and O-ring for installation after adjustment), spread cotter pin then install the O-ring and dust cap.
13. Install the brake caliper assemblies and bleed brakes if necessary. Install the front wheels.

Hub and Bearing Assembly
CAUTION: Do not begin this removal procedure unless the following parts are available:

• A new front axle wheel hub retainer (3B477) (Step 1).
• A new inboard halfshaft joint stub shaft circlip.

Once removed, these parts must not be reused during assembly. Their torque holding ability or retention capability is diminished during removal.
Removal

1. Turn ignition switch to the OFF position and place the steering column in the unlock position.
   

1. CAUTION: Discard the front axle wheel hub retainer. It is a torque prevailing design and cannot be reused. If loosened, the retainer must be removed and a new one installed.
   Remove and discard front axle wheel hub retainer (3B477).
   

1. Raise vehicle on hoist.
   

1. NOTE: Make sure steering column is in the unlocked position, and do not use a hammer to separate tie rod end (3A130) from the front wheel knuckle (3K185) . Use extreme care not to damage boot seal.
   
   Remove cotter pin from tie rod end stud and remove slotted nut. Discard cotter pin and nut.
   

1. Using Tie Rod End Remover 211-001 (TOOL-3290-D) or equivalent and Tie Rod End Remover Adapter 211-087 (T81P-3504-W), remove tie rod end from front wheel knuckle.
   

1. CAUTION: Use extreme care not to damage boot seal. Do not use power tools to remove the nut, or bearing and seal damage will result. Loosen the nut first, then remove nut from stud using the hex hold feature.
   For SHO vehicles, remove vinyl cover from upper link stud.
   Remove stabilizer bar link (5K484) from front shock absorber (18124) .
   

1. Remove disc brake caliper (2B120) and support with wire to obtain working space. Do not allow disc brake caliper to separate from the front disc brake caliper anchor plate (2B292) to prevent contamination of the disc brake guide pin journals. Do not allow disc brake caliper to hang from front brake hose (2078) . Remove front disc brake rotor (1125) . Remove front disc brake rotor from wheel hub (1104) by pulling it off the lug bolt (1107). If front disc brake rotor is difficult to remove from front wheel knuckle , strike front disc brake rotor sharply between lug bolt with a rubber or plastic hammer.
   If front disc brake rotor will not pull off, apply Rust Penetrant and Inhibitor D7AZ-19A501-AA or equivalent meeting Ford specification ESR-M99C56-A to inboard and outboard rotor/hub mating surfaces. Install 3-Jaw Puller 205-D027 (D80L-1013-A) or equivalent and remove front disc brake rotor by pulling on front disc brake rotor outside diameter and pushing on hub center. If excessive force is required for removal, check front disc brake rotor for lateral runout prior to installation. Refer to Section 06-00.
   

1. Remove anti-lock brake sensor mounting bolt and front brake anti-lock sensor (2C204) .
   

1. Remove and discard lower ball joint nut. Using Remover Adapter 211-211 (T96P-3010-A1), separate lower ball joint from front suspension lower arm (3078) .
   

1. Using Rotunda Spring Compressor 014-00781 or equivalent, compress front coil spring (5310) until lower ball joint clears front suspension lower arm .
   

1. Using Front Hub Remover/Replacer 204-069 (T81P-1104-C), Two Stud Adapter 205-237 (T86P-1104-A1), Metric Hub Remover Adapter 204-085 (T83P-1104-BH) and Front Hub Installer 204-067 (T81P-1104-A), press front wheel driveshaft joint (3B414) from wheel hub . Wire front wheel driveshaft joint to body to maintain a level position.
   
   
   
   
   
   Item Part Number Description 1 204-085 (T83P-1104-BH) Metric Hub Remover Adapter 2 204-067 (T81P-1104-A) Front Hub Replacer 3 — Turn Wrench Counterclockwise 4 — Hold Wrench Stationary While Turning Other Wrench 5 204-069 (T81P-1104-C) Front Hub Remover/Replacer 6 204-067 (T81P-1104-A)1 Two Stud Adapter A — Make Sure Metric Hub Remover Adapter 204-085 (T83P-1104-BH) is Fully Threaded onto 1107 and is Positioned Opposite the Two Stud Adapter 205-237 (T86P-1104-A1)

1. Remove and discard three hub and bearing retainer bolts from front wheel knuckle .
   

1. NOTE: Wheel hub is not pressed into front wheel knuckle . Do not use slide hammer to remove a stuck wheel hub . Do not strike back of inner bearing race. Use of these methods will damage bearing internal parts.
   
   NOTE: If bearing carrier is corroded to front wheel knuckle , apply Rust Penetrant and Inhibitor D7AZ-19A501-AA or equivalent meeting Ford specification ESR-M99C56-A to the inboard and outboard wheel hub/knuckle mating surface and allow to soak.
   
   Remove wheel hub from front wheel knuckle .
   
   
   
   
   

Installation

1. NOTE: If wheel hub is damaged or if any end play is detectable, replace wheel hub . End play is not adjustable. If wheel hub is disassembled, the assembly must be replaced.
   
   Remove all foreign material from knuckle bearing bore for correct seating of new wheel hub.
   

1. Lightly lubricate mating surfaces of bearing corner and front wheel knuckle.
   

1. CAUTION: Knuckle bore must be clean enough to allow wheel hub to be completely seated by hand. Do not press or draw wheel hub into place.
   Position wheel hub in front wheel knuckle . Install three new hub and bearing retaining bolts. Tighten to 83-107 Nm (61-78 lb-ft).
   

1. Push front wheel driveshaft joint into wheel hub . Hand start front wheel hub retainer.
   

1. Slowly release Rotunda Spring Compressor 014-00781 or equivalent while guiding lower ball joint into front suspension lower arm .
   

1. Install new lower ball joint nut. Tighten to 68-92 Nm (50-67 lb-ft).
   

1. Install tie rod end into front wheel knuckle . Install new slotted nut and tighten to 47-63 Nm (35-46 lb-ft). If necessary advance nut to install a new cotter pin.
   

1. CAUTION: Use extreme care not to damage boot seal. Do not use power tools to tighten nut or bearing and seal damage will result. Install nut using hex hold feature to prevent the stud from rotating.
   Install stabilizer bar link to front shock absorber . Install stabilizer bar link nut. Tighten to 77-103 Nm (57-75 lb-ft). For SHO vehicles, install stud cover.
   

1. NOTE: Remove rust from the rotor and hub mating surfaces with a medium abrasive pad.
   
   Install front disc brake rotor and disc brake caliper . Tighten caliper anchor bracket bolts to 88-118 Nm (65-87 lb-ft).
   

1. CAUTION: The front axle wheel hub retainer must be tightened to specification immediately during installation. If the retainer is not tightened immediately, the nylon lock will set incorrectly, leading to incorrect torque readings and bearing failure. Any front wheel hub retainer that is not immediately tightened to specification or is loosened must be removed and a new retainer installed.
   Install front axle wheel hub retainer . Tighten to 230-275 Nm (170-203 lb-ft).
   

1. Install wheel and tire. Tighten lug nuts (1012) to 115-142 Nm (85-104 lb-ft).
   

1. Lower vehicle.
   

1. Pump brake pedal prior to moving vehicle to position brake linings.
   

You must have a piston stuck in one caliper, and it's not releasing the pressure off your brake pad.

REAR WHEEL BEARING/ HUB

Removal Procedure

1. Raise the vehicle. Refer to Vehicle Lifting in General Diagnosis.
2. Remove the wheel and the tire. Refer to Tire and Wheel Removal and Installation in Wheels, Tires and Alignment.
   1. Remove and support the brake caliper. Refer to Brake Caliper Replacement (Front) or Brake Caliper Replacement (Rear) in Brakes.
   2. Remove the brake rotor. Refer to Brake Rotor Replacement in Disc Brakes.
   3. Remove the ABS sensor wire connector.
   4. Remove the four bolts from the control arm.
   5. Remove the hub and bearing from the control arm.
   6. Remove the brake shield from the control arm.
   7. Clean the control arm face and the bore before installing the hub and the bearing.
   Installation Procedure
   
   Notice: Refer to Fastener Notice in Service Precautions.
   
   1. Install the brake shield and the hub and the bearing to the control arm with the four bolts. Be careful not to drop the hub and the bearing, as it could be damaged. Reconnect the ABS sensor. Tighten the hub and bearing bolts to 70 Nm (52 ft. lbs.).
   2. Install the brake rotor. Refer to Brake Rotor Replacement in Disc Brakes.
   3. Install the brake caliper. Refer to Brake Caliper Replacement (Front) or Brake Caliper Replacement (Rear) in Disc Brakes.
   4. Install the wheel and the tire. Refer to Tire and Wheel Removal and Installation in Wheels, Tires and Alignment. Tighten the wheel nuts to 140 Nm (100 ft. lbs.).
   5. Lower the vehicle.