Air in the brake system- Brake system needs to be bleed and fluid needs to be added while you are doing that.
You need to bleed the brakes.
Try bleeding your brakes. If there is air in the system it can give a spongy feeling to your brake pedal and require you to pump your brakes and/or put your brake pedal to the floor.
The best way to tell when you need brakes is by squeaking, when the brakes are rubbing against the metal, when your brake pedal goes all the way to the floor and when you are running out of break fluid.
Probable causes: Low or no fluid in reservoir; Worn brake pads/shoes; Air in brake lines; Leaking brake line.
If your brakes are making a squeaking or a grinding noise when you are coming to a stop this is usually an indicator that your brake pads need to be replaced. Also, another sign that your brakes need to be replaced would be if your brake pedal goes all the way to the floor when pressed and it seems to be taking longer to stop.
Usually means they probably didn't bleed the brakes or did not top off the brake fluid
The brake fluid level might be low in the brake master cylinder in your engine compartment from a leak somewhere , or maybe you have air in the brake line(s) and the brake system needs to have the air blead out
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.
The brakes will have either:Another problemNeed to be properly bled.The additional component is probably the anti lock brake servo. This component requires a special bleeding procedure.
Check the caliper slides (may be frozen) should slide freely to compensate for brake pad wear
you either need a new brake master cylinder or your brakes need to be bled
The power brakes on most vehicles operate on the engine vacuum. If there is a leak or problems with the power brakes it can make a hissing sound. But then, sometimes power brakes do that when they're working properly. It could be from either a hole in the diaphragm of the brake booster or normal operation. If the sound is new, and was not there before, and your brake pedal is going to the floor, then you should have the power booster replaced.