2001 SUBARU OUTBACK User Comment / Complaint

2001 subaru outback. when the temp falls below 20, and the car has sat for several hours, brakes will momentarily not work. specifically, i apply the brakes to slow down, they will feel hard to push and will slow the car, i let up and push again, they feel even harder, and will not slow the car. usually the fourth time i pump them they return to normal operation. this has happened in the past, i took the car to the shop, who said there was nothing wrong. pads were fine, no water in the fluid. fluid was changed and problem has recurred since then.