my brake fluid gets low but no leak?

The other two guys are right, check for a leak between the master cylinder and the main booster. FYI, 1 inch from the Max line is a lot. Do you ever bother to check the fluid level or is it always Jiffy Lube "finding" that you are low on brake fluid. For the most part, brake fluid doesn't just disappear or gets used up or there is no such thing as normal brake fluid loss. Either you have a leak or you don't. Keep an eye on the level of brake fluid, next time you go to Jiffy Lube, wait and see if the brake fluid is low again. A complete "brake job" could run you about $900 if you're not careful. Especially when they throw it in your face that's its a safety hazard.

Edit:

You should probably wait the next time you need new pads and take it to another shop and have them check out the car for leaks. I think one of the bleeder valves has a broken seal and is leaking just a little.

Loss Of Brake Fluid

Well there are only 8 things that I can think of that it could be, most vehicles have either discs brakes on 2 or all for wheels and the drum brakes on the other 2. If your car is still stopping that's a good sign. 1) Low or no pads 2) Worn down disc 3) Low or no shoes 4) Worn down drum 5) Internel leaking (in drum brakes, brake fuild tank) 6) External leaking (caliper or brake line) 7) Mechanic forgot to bleed the brakes or didn't do a good job of doing it. Bleeding the brakes means that he took all the air bubbles out of the system after replacing the pads and shoes and topping up the brake fluid tank. 8) Mechanic forgot to put the shoes and other parts back in one of the drums (rear wheels) - this I have seen happen once, a person needed new brakes put on his truck when on vacation in the states and noticed the pedal going to the floor and the low brake fluid light coming on after getting his truck back. He was on the way back to Ontario when he had this done and when he got home he brought his truck into the dealership I was working at and I happened to be helping the mechanic that got to look at this guy's truck. The brake pads and parts were put together fine on the driver's side, but there was no pads or parts on the passanger side. When I took off the drum on the passanger side, there was just the caliper.

The fluid may be leaking from the master cylinder to the brake booster. That would take a while to show up.

Brake Fluid is cheap - as long as the problem doesn't get worse, just keep an eye on it.

nah dont worry about it. youve have it just about thoroughly checked. in a way thats good, you know your brakes are pushing out more than enough fluid to maintain them. just keep fluid in it. big bottle is like 6-8 bucks.

its either pads, or,your master cyl is leaking to your booster.if you remove the vac line for the booster at the engine and run your finger inside it, then taste it, youll know. its so bitter youll spit for hours.