My car is losing break fluid but there is no leak?

My brakes went out, is when I realized that the fluid was totally empty, so I filled it up and it got air in it and then my brakes still suck, my mechanic had to take the air out. he refilled the brake fluid and two weeks later I went in for an oil change and the fluid is almost all gone again? He cant find the

My brakes went out, is when I realized that the fluid was totally empty, so I filled it up and it got air in it and then my brakes still suck, my mechanic had to take the air out. he refilled the brake fluid and two weeks later I went in for an oil change and the fluid is almost all gone again? He cant find the leak, he says the calipers are fine and he doesn't seem to find why its losing the fluid, he said get second opinion or go to dealer but wth

Best Answer:

natasha: If the brake pads have a lot of mileage on them the brake fluid in the reservoir will go down and the red brake warning light can come on. If you've been adding brake fluid and it keeps going down you must have a leak. Have you checked the brake lines under the length of the vehicle to look for wet spots? Inside the tires to see if they are wet from a brake fluid leak? The front of the master cylinder can also leak and the brake fluid goes into the brake booster and you'll never see the leak unless the master cylinder is removed. Go to mechanic before the brakes don't work when you need them the most!

Other answer:

natasha:
if the brake pads have a lot of mileage on them the brake fluid in the reservoir shall go down and the red brake warning light can come on… if you've been adding brake fluid and it keeps going down you must have a leak… have you checked the brake lines under the length of the vehicle to look for wet spots? inside the tires to see if they are wet from a brake fluid leak? the front of the master cylinder can also leak and the brake fluid goes into the brake booster and you'll never see the leak unless the master cylinder is removed… go to mechanic before the brakes don't work when you need them the most!
Barnes:
It's brake fluid. It doesn't evaporate so there must be a leak. You, or your mechanic, just hasn't located it yet. I once found a steel brake pipe under the car that was buried in mud. The mud was saturated with fluid but it never dripped onto the ground. So carry out a closer inspection of all the lines and any concealed items such as brake cylinders in drums.
notned:
There is a leak somewhere you have just thought I'd add brake fluid does not mysteriously vanish into a weird parallel dimension
Grandpa:
Brake fluid does not evaporate, if it is going down, you have a leak somewhere. Perhaps what you really need is a better Mechanic.
choko_canyon:
If it's losing break fluid, there's either a leak or the indicator is broken.
Pat F85:
Your missing brake fluid is leaking from the master cylinder into the power brake booster, that's why you don't SEE any leaking from any brake lines or the calipers/wheel cylinders.
You have to replace both master cylinder & booster, because the fluid from the leak into the booster deteriorates the rubber diaphragm in the booster and it will fail soon because of that.
Have the mechanic pull the master cylinder away from the booster to see and verify the leak.
realtor.sailor:
It's "brake." Are you sure? As brake pads wear down the fluid level is lower. But you should have a mechanic check it asap.
don r:
Could be a leaky power brake booster letting brake fluid suck into the intake manifold.

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