Mercury mountaineer 1997 brake pedal won't fully return

SOURCE: 1997 Mercury Mountaineer

if the engine is a 4.6L the pcv will be on top and in middle of pass side valve cover.pull to remove.
if the engine is a 4.0L the pcv is located at the rear(firewall) of drivers side valve cover.this pcv has lock tabs holding it in,turn then pull to remove,the lock tabs are part of the valve cover so take care when removing not to harm tabs.

SOURCE: 2004 Mercury Mountaineer Emergency Brake Adjustment

Greetings larslabs,
My name is Dennis and I can assist you to finding your parking brake adjustment location.
1) the adjustment is located so that you have to remove your center console floor finish panel (this is the drink holder).
2) raise your parking brake lever and gently pry the plastic tabs from the center console.
3) Once you can see the park brake lever you will see a nut that is turned to adjust the lever so that it has 5 clicks when it is applied.
Glad to be of assistance and thank you for using FixYa. Please rate the solution because I can learn from your rating (and it keeps my rating up to date). Thank you, Dennis

SOURCE: Parking Brake Assembly for a 2004 Mercury Mountaineer

go to an advance or auto zone parts store if they are more they will price match

SOURCE: Brakes on 2000 Mercury Moutaineer wont stay

did you check the master cylinder? makke sure the cap is on tight....and full of fluid

SOURCE: 1997 mercury mountaineer cigarette lighter

http://www.genuineservice.com/genuineservice/en/default?page=genuineService

Go to this website and pick owner guide on left task bar. Input vehicle info then get the owners manual.Your fuse panel info starts on page 120.

To replace lighter just reach around behind it and unhook connectors. The stick something in the socket(I usually use 2 fingers) and twist it counter clockwise. the center will screw out of the sleeve.