Brake Fluid Reservoir

[jclarkey]

Quick questions. On my 74 there are two separate brake fluid reservoir, both with their own caps. I have a a slight leak in one of my callipers (which I am fixing) and want to top up the fluid. Which one do I fill, or do I do both? Looking at the reservoirs from the front of the car, the one on the left (passenger side) seems slightly lower than the one on the right.

[So Cal Mark]

one reservoir is for the front brakes, the other for the rear