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It's a sealed system, so it's got to be going somewhere, leaking somewhere (or boiling off from severe braking operations over and over). Since you likely haven't experienced extreme braking, it must be leaking somewhere.
You will have to trace all your brake lines from the master cylinder to each wheel to check for any sign of leaking. Front calipers are easy to spot leaks when they leak. If you have drum brakes on the rear, you may need to pull off the drum to check the wheel brake cylinders. Peel back the rubber boot on each end of the wheel cylinder and look for any fluid leaks there. Another place to check is at the back of the master cylinder. If a seal is bad there, it has been known to leak fluid inside the car, under the dash. Feel around the carpet under and behind the brake pedal for any wetness. If you find brake fluid there, you will need the master cylinder replaced or rebuilt. Hope you find the problem. Don't forget to check the ABS system and brake lines, too.
There might not be a leak but I think there is AIR within the hydraulics. So if you have not checked your brake hydraulics for a very long time, it is good to check the master and brake cylinders.
Finally you need to BLEED out the air so that on the first pump you get a hard pedal.
Check at the wheels for possible smear of fluid indicating small leak and air intake.
If you mean the brake warning light on the dash is coming on, it is telling you that you have a problem with your hydraulic system, There is a switch that senses an imbalance between the front and the rear brakes. First check your brake fluid, if it's low than you have a external leak. If it's not low, the master cylinder has failed internally.Lokk for brake fluid leaks behind each wheel and at the back of the master cylinder. If you can find a leak or it's not low on fluid you had a bad master cylinder.
Hi. If you are loosing brake fluid, you have a leak somewhere. What I would do is jack your car up, making sure it is safe to go under. I would then make sure the master cylinder was full and then I would ask someone to sit in the driver's seat and slowly pump the barkes with the car running. While under the car, carefully trace all of the brake lines looking for the leak. Also, be sure to check the bottom of the master cylinder for leak. I discovered a small leak behind my master cylinder (against the firewall) that resulted in a slow, difficulat to find leak. I hope this helps. Good luck!
Sounds like your master cylinder is shot. Go to a parking lot, stop, and pump the pedal a bunch of times. Then get out and see if there is any fluid leaks by any of the wheels. That would indicate a brake line leak. My first guess, however, is your master cylinder.
There is Supposed to be a Gasket Between the Booster and Master Cylinder. If this Gasket is Gone it will leak like this. If it is Still There, You may need a New Master Cylinder or Booster Depending on what you find when you get it Opened up. Please Rate My Response! Thanks!