I just paid $500.00 to replace all brake pads and the front rotors
The Mercury Mountaineer has hydraulic brakes, not air brakes.
To change the rear brakes on a 2000 Mercury Mystique, start by safely lifting the vehicle and removing the rear wheels. Next, remove the brake caliper bolts and slide the caliper off the rotor, then take out the old brake pads. Replace them with new pads, ensuring proper orientation, and reattach the caliper. Finally, reassemble the wheel and lower the vehicle before testing the brakes to ensure they function correctly.
The brakes on the Villager are as straight forward as the brakes on a 1965 Mercury. Only normal brake tools are required.
It sounds like you need to bleed the system of air.
Pads on front, drums or pads at rear. Ask at a good auto part store with year of car
Any Auto Parts store can provide you with this information.
replace calipers in pairs. replace brake hoses at the same time.
The best way is to go to a junk yard and pull the disk brake assembly off of a Cougar, or a Contour/Mystique, the latter two will require you still purchase a Cougar specific E-Brake cable though. There's plenty of info on this conversion in the wheels, tires, and brakes section at the newcougar.org forums.
did you replace the master cylinder if so it has to be bleed frist
Brakes come in two types: disc or drum.See "Related Questions" below for coverage of both types...
To replace the brake pads on a 1998 Ford Contour, first, lift the vehicle and remove the wheel. Next, remove the caliper by unbolting it from the bracket, then slide it off the rotor. Replace the old brake pads with new ones, ensuring they are properly aligned, and then reattach the caliper. Finally, reassemble the wheel, lower the vehicle, and pump the brakes to ensure proper function before driving.
It would be to your advantage to take your car to a Brake Repair Shop if you have to ask that question brakes are not something you should do if you do not have the skill, WBMS