I cant seem to isolate this problem. All i did was change my brake pads and now i'm losing brake fluid. Pressure is fine but after about 10 mins of driving my brake light comes on because theres no fluid in the reservior. I inspected my front calipers and rear wheel cylinders for wetness and there both dry.I checked for leaks around my mc and brake booster under the hood and under the dash, both dry. My driveway is also dry i checked all of the brake lines and found nothing, all dry. I sat there pumping the brakes still found no leaks. I noticed that when the car is stationary the fluid doesnt go down, only when i drive. strange..

What are other things i can check for? thanks in advace..

 

the master cylinder might be leaking fluid into the brake booster.....if it is you have to replace BOTH....

 

yep master could be dumping into booster