The rear res. if VERY DIFFICULT TO SEE. Look at the inside rear corner of the res. You should see the divider and the two levels.

The rear res. is also difficult to fill. You need to fill to near the top of the opening, then rock the res. back and forth and watch the inside rear corner to see that the rear res. fills.

This is a common problem that guys have with these cars. You THINK the res. is full, including the rear, but it's not! Then you bleed the rear res. dry and nothing happens when you try to bleed the rear brakes even though the res looks full.

Duke