What type of car? Explain contention better.
probably have a bad master cylinder.
Possibly a bad master cylinder.
First, make sure the master cylinder is filled with brake fluid. If it is low, there may be a leak somewhere in the brake lines or a brake cylinder. If the master cylinder is bad, you can normally pump the brakes up, but the pedal will slowly sink to the floor again. The master cylinder needs to be replaced or repaired.
Parking brake? Service brakes? Pedal dropping? Bad Master cylinder? ABS Module?
There is probably air in your brake lines. Or you might have a bad master cylinder.
In most hydro brake booster systems the pump also runs the power steering system so if the power steering works the pump is okay. It sounds like you have a master cylinder problem.
Check your fluid level first. If it is low then your problem is a leak in the system. If the fluid level is OK then you probably have a bad master cylinder. To check the master cylinder pump on the brake pedal and hold the pedal down. Usually the pedal will slowly go to the floor. This means the master cylinder is not holding pressure. You should not take any chances with brakes!! Get them repaired at a qualified repair facility.
leaking brake line or master cylinder..? It sounds like a bad master cylinder. Years ago these could be re-built, but with the newer ones, they must be replaced. By pumping the brakes, you build up pressure which prevents the piston in they master cylinder from leaking, cut after sitting, the seals leak again. A good mechanic will be able to tell if it is the master cylinder or not.
Fluid leak - check wheels for sign of leakage Bad master cylinder
Bad fluid in master cylinder,flush system,bleed brakes
You may have a bad master cylinder, or proportioning valve,Does the vehicle have Antilock Brakes (ABS) ? Please let me know.Ben
This could be caused from the closing off of the flex line or a bad caliper or a bad master cylinder