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If the master cylinder reservoir is empty, you have a leak somewhere. If the master cylinder reservoir is full, the master cylinder is bad.
The brake master cylinder is what pushes brake fluid to each wheel when you press on the brake pedal. If it's bad or marginal, your braking will suffer or disappear entirely! This is something that you need to address right away! FriPilot
master cylinder is bad or you have a leak
It means your master cylinder needs to be replaced or rebuilt. The seals inside the cylinder can go bad and cause this to happen.
Yes. The engine will idle poorly when a vacuum power brake booster goes bad. It can be a source of a large vacuum leak. A bad master cylinder however would have no effect on the performance of the engine.
how do i know the master cylinder is bad ?
clamp the line to the slave cylinder and mash the clutch pedal. if the pedal gets hard to push,the slave is bad. if the clutch pedal goes down slowly with moderate pressure,the master cyl is bad clamp the line going to the slave cylinder. meant to say that in the previous answer
Soft clutch pedal that goes to the floor. Repeated pumping does not help.
One sign is if you place you foot on the brake pedal and apply steady pressure, and the pedal slowing goes down toward the floor, the master cylinder is bad. As this car is 9 years old, when replacing the master cylinder, replace all the brake fluid in the entire system with fresh fluid from an unopened can. 1. It could have a leak at the master cylender. 2. the brake peddle slowly goes all the way to the floor.
The gasket to your clutch master cylinder is probably broken or cracked. or your master cylinder is bad.
Look for leaking fluid at the slave or master cylinder.
Air in a brake line or a bad master cylinder could cause this. Bleed the brake lines if you have been working on any brake cylinder. If this happened without any warning, the master brake cylinder is probably the cause and should be replaced.