But only in very unusual circumstances. They pumped to no avail.
Some vehicles have diagonal-split systems, linking the front left brake to the right rear brake.
It is imperative in cases such as this that the investigator determine the type of system in the vehicle in question. After just a couple of years, the fluid may have absorbed several percent worth of water, lowering the boiling point to 300F or less. Fluid will even absorb water through the walls of a closed plastic bottle on the shelf, so one should avoid using even unopened OLD fluid. 300F is not that uncommon in passenger vehicle brake components, but generally the heat dissipates before it can boil the fluid. While the brakes are not applied, there is a compensating port in the master cylinder which allows fluid to drift lazily back and forth to the reservoir.