Either the caliper piston is frozen stuck or the hydraulic brake hose has collapsed internally. Open the bleeder on that caliper and see if the pressure releases, if it does you have a bad brake hose.
cailper is bad or brake hose is collasped
You need 3/8 Allen key.
There are several things I would need to know to answer correctly:What kind of vehicleWhat yearWhat type of brakesThe fact that one brake does work means there is an underlying problem with the rest that needs to be repaired.Usually on a car one brake working means that the other three have seized hydraulic systems in each brake and require the replacement of the cylinders or Calipers.
Bleeder screws would be on the bottom of caliper-making complete air evacuation either difficult or impossible resulting in a spongy pedal
# Release the parking brake # Remove the cowl trim panel from the left side of the drivers compartment for access to the parking brake pedal # Pull back on the parking brake cable toward the control assembly (parking brake) and insert a 5/32 inch drill bit into the control actuator to lock the assembly into position # Its actually easier to pull the parking brake cable from under the vehicle but you will need an assistant to help you do this way. # Loosen the rear wheel lug nuts and raise and support the truck # Remove the brake calipers and the brake discs # Detach the parking brake cable from the actuator arm # Clean the parking brake assembly with brake cleaner # Remove the brake shoe retracting spring # Remove the adjusting screw spring and remove the adjusting screw # Remove the hold down springs from the shoes # Remove the parking brake shoes from the actuator
I would jack up the vehicle and support it with 4 good jack stands, remove all 4 wheels and disassemble all the brakes inspecting the pads/shoes, rotors/drums, calipers/wheel cylinders, all hold down hardware, brake hoses, brake lines, master cylinder, e-brake cables, e-brake shoes and grease seals, then make a list of the parts that are to be replaced. Without doing this you won't know what you need and don't need to buy.
I believe that would be a 1/2 inch wrench, but would it be too difficult to take 2-3 wrenches and try them fr size.
To remove the calipers just knock out the two square pins that are on the top and side. The best way i found to do this is use a long socket extension. put the insert end (the end you would put the socket on)against the pin and tap on the other side .
MOISTURE IN YOUR BRAKE FLUID. FLUSH SYSTEM WITH NEW FLUID.
it cost me 650$ for new front calipers and discs, they seased up
One of the brake calipers or drums is not completely releasing. If it's a disk brake, replace the calipers. If it's a drum, check the emergency brake cable.
check brake hoses. check brake fluid condition, if fluid is contaminated or mixed with wrong fluid, calipers can lock-up or stick. check caliper bolts, hardware, caliper brackets. replace if broken, bent, or missing.
Whether caliper paint improves caliper function is debatable, but it is generally agreed that it improves durability. In your case, I would suggest that it is the calipers which are malfunctioning.
A brake calliper for a 1986 Ford Ranger would be likely to cost between $20 and $40, depending on where you source it.
If you are mechanically inclined, then you could use a manual for your specific vehicle and fix/replace the brake calipers yourself. If you are not mechanically inclined, then I would suggest finding a reputable local repair shop or dealership to take your vehicle to so that they can repair it correctly.
Be sure to change both front brake hoses. I didn't and my calipers would lock up.
Brake calipers stick when they get old. You need to replace it and the other side While you're at it.
My guess would be that you might have a bad brake hose to one of the front calipers.