If only one wheel is grabbing, check the opposite side for problems like a frozen caliper, pinched brake line, a restricted brake hose or a bad grease seal allowing grease to get on to the rotor.
The caliper holds 2 brake pads in
In CT USA, a garage would charge 1 hour labor to replace the rear brake pads on that Mountaineer.
You have a leak in the caliper piston most likely due to rust which causes brake fluid to leak past the rubber seal. To fix, you have to either rebuild the caliper yourself or buy a rebuilt caliper from the parts store. If you buy a rebuilt caliper, it will come loaded or unloaded. Loaded = comes with brake pads. Unloaded = caliper by itself (no pads).
Factory bought for you specific vehicle..
NO
Contamination from oil or grease?
Non-asbestos brake pads were introduced in the 1990s. At first they were not suitable for use in heavy-duty vehicles. As a result, asbestos brake pads were not suddenly eliminated, but slowly phased out.
Dust, unevenness.
Breaks will often squeak when they are wet, such as after a heavy rain, on a humid day, or on a foggy morning. The water prevents the pads from properly grabbing the rotors. This causes the squealing noise.
Bad rotors
worn pads change your brake pads and get your rotors machined while your at it
Chirping means the brake pads are worn out. That is a warning device built into the brake pad. Replace the brake pads.
brake shoes or pads are worn and need replacing
The brake pads are probably worn. If not repaired, then the metal backer of the brake pads can cut into and damage the brake rotors. Noise is a sign to check the brakes as soon as possible.
Brake pads are part of the cars disk brakes. There are four different brake pads they are semi-metallic brake pads, organic brake pads, low-metallic NAO brake pads and ceramic brake pads.
shoes? or pads? (front) question needs to be more detailed
normally loose brake pads or discs