Rear brakes pads

Question edited for clarity.

Did you fit a new shim kit? In reverse, the brake pads can tilt and jam. Do you have room to go forwards a bit? Apply brakes and reverse again.

https://www.ebay.com/itm/174690971266

https://www.google.com/search?q=2018+ford+taurus+rear+brake+shim+kit

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the build date is on the white sticker on the drivers door

YOU NEED TO SAFELY RAISE SUPPORT REAR OF VECHICLE ON JACKSTANDS. MAKE SURE VECHICLE PARKED ON SOLID LEVEL GROUND. YOU NEED TO SIPHON JUST A LITTLE BRAKE FLUID OUT OF THE MASTERCYLINDER.BECAUSE YOU NEED TO USE LARGE C - CLAMP TO COMPRESS FORCE PISTONS BACK IN THE CALIPER BORES USING LARGE C - CLAMP DOING THIS WILL ALLOW YOU ENOUGH ROOM INSTALL NEW REAR BRAKE PADS.TO REMOVE REAR PADS ONCE YOU COMPRESS PISTON BACK IN THE CYLINDER BORE. YOU CAN TO REMOVE REAR BRAKE PADS BY REMOVING RETAINING PINS IF EQUIPPED OR BRAKE PADS HELD IN PLACE BY RETAINING BOLTS.ONCE YOU HAVE NEW REAR BRAKE PADS INSTALLED.PLACE MASTERCYLINDER COVER BACK ON TOP OF MASTERCYLINDER THEN PUMP BRAKE PEDAL TO SEAT NEW REAR BRAKE PADS AGAINST THE ROTOR UNTIL BRAKE PEDAL FEEL FIRM AND SOLID.THEN RECHECK BRAKE FLUID LEVEL IN BRAKE MASTERCYLINDER ADD LITTLE MORE FLUID IF NEED DONT OVER FILL MASTERCYLINDER.

Here ya go! This is for the rear brake pads removal:

Removal & Installation

1. Remove the brake master cylinder filler cap. Check brake fluid level in brake master cylinder reservoir. Remove fluid until brake master cylinder reservoir is half full.
   
2. Raise and support the vehicle.
   
3. Remove the wheel and tire assembly.
   
4. Inspect the brake pads for wear or contamination. If worn, damaged or past specification, install new components.
   
5. Remove the caliper pin bolts.
   
6. Remove the rear disc brake caliper.
   
7. Remove the brake pads and rail clips.
   
8. Inspect the disc brake caliper for leaks. If leaks are found, disassembly is required.
   
9. Installation is the reverse of removal. Observe the following torques:
   
   • Caliper bolts: 27 ft. lbs. (36 Nm)
     
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The easiest way is to:
open the bleeder nut
use a C-Clamp to depress the caliper so you can slide in your brake pads. ;-)

Yes they will be. Especially if you have the parking brake applied. The piston must be pressed back into the caliper cylinder completely to install the new pads. So you need a tool to do this. Ask at the autoparts store where you purchased the pads for the correct tool for you vehicle. You need to pry them back a little to slip the pads past the unworn ridge on the rotor, then use the tool to press the piston back into the cylinder all the way.

The pistons in all calipers I have seen can be forced back into their seat to allow new brake pads to clear. If constructed as most, a C-clamp can be used to press the cylinder back in.

Hi:
If you have replaced all pads, and see no leaks at any wheel, and have bled your brake system, then most likely your brake master cylinder has failed.

FIRST adjust rear brake starwheel while spinning tire FOWARD. then alongside drivers side of car find emergency brake cable adjustment (long threaded rod with nut) . hold one end of rod with vise-grips and turn nut until emer. brake cable has less slack in it. now go inside car and apply e-brake.you dont want the pedal to stop right away but u also dont want too much"travel" in the pedal.so about halfway is IDEAL. IMPORTANT- once the brake cable is adjusted and the car wont roll foward in gear with the brake on and applying a little "gas"-make sure with brake OFF that rear wheels turn freely. hope this helps.

for the brake pads?its a shim.every brake pads sould have them on each pad.