It means your master cylinder needs to be replaced or rebuilt. The seals inside the cylinder can go bad and cause this to happen.
Sounds to me like the master cylinder is shot.
2 reasons: 1. There is no fluid in your master cylinder due to a leaking master cylinder or slave cylinder or 2. You blew your clutch
Normally this is caused by a Master Cylinder that has failed. Replace the Master Cylinder. Normally this is caused by the loss of fluid in the brake system. The fluid reservoir needs to be checked first. It possibly may be caused by a bad master cylinder but the most common cause is loss of brake fluid.
A symptom you almost always feel is a brake pedal that will not hold. You stop, hold the brake, and the pedal will slowly move toward the floor. This is a sure sign the master cylinder is bad. A leaking master cylinder or one that sticks, is also a sign is is defective. When you replace the master cylinder replace all the brake fluid in the brake system and bleed the brakes. Moisture in the brake fluid will destroy a master cylinder and this may be why it failed.Brake fluid leaking from the master cylinder. When you stop and hold your foot on the break the brake pedal will slowly go to the floor. Either of these symptoms means your master cylinder must be replaced.
Defective master cylinder, low of fluid, or leak somewhere else in the system.
you either need to bleed your brakes, add fluid or get a master cylinder darrellshandyman@live.com
Low fluid level or defective master cylinder.
Gradual Loss of brake pedal height (pedal sinks to floor)? but fluid level proper--internal leak Loss of brake fluid? Back of master cylinder (where is attaches to booster) wet with brake fluid? External Remove master cylinder and see if booster has fluid in bottom (bad real seal)
At the master cylinder which may be under the drivers floor under a panel. If you do not see it, follow the brake lines. They will lead you to the master cylinder.
The fluid for the clutch comes from the brake fluid. After the brake master cylinder, there is a clutch master cylinder which takes fluid from the brakes. Fill up the Brake master cylinder.
Your brake master cylinder may be leaking. Have it checked by a technician.
The brake pedal will sink to the floor when applied and the brake fluid reservoir remains full.