Quote:
Originally Posted by 97 SL320
The master cylinder reservoir has a internal dam ( 2 when there is a clutch master cylinder port ) to prevent one circuit from draining all the fluid if another leaks. You probably ran out of fluid on the side you are bleeding.
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Right answer. There is indeed an internal separator in the reservoir. If the fluid runs low while you're pumping out the rear brake, the reservoir will LOOK full, but it isn't. After a few strokes, you'll be pumping air. When I'm bleeding rear brakes I keep the reservoir filled to the brim, then suction out any excess after I'm done.