Jeff,
Thomas & Kurt pointed out they are usually different sizes.
One additional item, often overlooked, is that
you want the clutch master cylinder to fully flow the
same amount of fluid in BOTH directions (when the clutch
pedal is pressed, and released).
On the brake master cylinder you want full flow when the
pedal is pressed, but a restricted flow when the pedal is
released. This provides for a "pumping action" by allowing
you to rapidly pump the brake pedal. Good thing!
On the brake master cylinders they have a small rubber
disc with metal insert. They are bi-directional as you
want the metal side towards the master cylinder, which
allows for the fluid to push out the the rubber allowing
for a large outgoing flow. When the fluid returns it will
press up against the rubber seal, closing most of the
holes in the metal disk off and allowing fluid to only
flow back through on hole.
http://www.tomwalter.com/bmc_kit.jpg
Out of focus photo. The two "restrictor" valves are in the
middle of the photo. One metal side up, other is rubber side
up.
Note: The "restrictor" valves are noted as "check valves"
in the Nissan Literature. I think of a check valve being
a "one way flow only". Not sure of a technical term for
"one way flow - non restricted, restricted return" valve.
Cheers,
Tom Walter
Austin, TX
(really Round Rock... but few folks know about the rock!)
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