It sounds like you got a small leak, you did not mention in your original post that you remove the rear drums and check the wheel cylinders. If I were you I would start with bleeding. Doesn't cost anything but brake fluid.
Note: the brake bleeding order:
left front wheels.
This should be done about once a year because the fluid is like a sponge and takes on water from the air via the reservoir. When the fluid gets to around 3% water it has a lower boiling point and you need to change it out because you don t want it boiling when the brakes get hot. When the fluid boils it makes bubbles which can compress and then the brakes don t work very well.
Wednesday, February 18th, 2015 AT 8:16 PM