you might have fluid leaking before that.. lots of press no volume
That depends on where it's leaking out; if it's at the master cylinder, you have a bad master cylinder, if it's at the wheel cylinder you have a bad wheel cylinder if it's at a caliper... well, you get the idea. If you know how to repair a master cylinder, wheel cylinder or caliper, you can often get by with a little savings but it's usually best to just trot down to your local auto parts retailer and get a new or rebuilt one.
A quick take-up master cylinder
The Master Cylinder is part of your Braking system. It is usually located on the Firewall of your car and holds the brake fluid which allows you to stop by pushing fluid against the caliper on your brakes when you put your foot on the pedal. The cylinders of an engine are usually referred to as combustion chambers, or simply the engine block.
Master cylinder or drum brake (hydraulic slave) wheel cylinder or disc brake caliper cylinder? drum brake shoes rear
master cylinder, caliper, wheel cylider and power streeing
from the furthest caliper from the master cylinder. Start with that one and move closer.
If you are wanting to colaspe the piston so you can fit new pads in the caliper, first open the master cylinder, then use a "c" clamp or "c" clamp vise grips to slowly push the piston back enough to place the pads in and then fit caliper over your rotor.Keep in mind there may be a mess at the master cylinder.
You've either got a bad Brake hose or bad master cylinder. Both these things can cause a caliper to stick.
no you dont have to---BUT its adviseable
use a large c clamp and push the piston back in, just be sure to not over fill you master brake cylinder because you will be pushing more fluid into it.
Master cylinder possible but could also be wheel cylinder problems or warped rotors
If the master cylinder reservoir is empty, you have a leak somewhere. If the master cylinder reservoir is full, the master cylinder is bad.