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| Brake Master Cylinder | ||||||||||
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| An Original 1981 Z28 Mater Cylinder | ||||||||||
This is an original 1981 Z28 Camaro Brake Master Cylinder. Most cars found today have GM replacement brake master cylinders.
Note that even if the master cylinder was replaced 6 months after the car was purchased in 1981, it would have been replaced
with a GM replacement and NOT an original master cylinder. You can confirm that it is original by reviewing the following:
1) the original is ALL solid aluminum and will show no signs of rust. Note that this is only one test for originality, as
some of the better replacements were also solid aluminum. However, if you see a rusting brake master cylinder, it is definitely
a cast iron replacement. The second test for originality is 2) the shape of the front of the master cylinder. Note that the
nose on this original master cylinder is not perfectly round, but more of a "D" shape, with the straight edge of
the "D" being on top. A GM replacement will be perfectly round on the nose. Compare your master cylinder to this
photo, if it has the EXACT shape on the front and is also ALL ALUMINUM, it is an original 1981 Z28 brake master cylinder. Note that this photo also provides a clear view of the brake booster, which is cadmium plated. The 1981 brake
master cylinder and booster are UNIQUE to 1981. No other Camaro year has this specific master cylinder and booster. An original
brake booster must be cadmium plated. Cadmium plating is done on steel to make sure that it is gives that necessary corrosion
and sacrificial resistance to the steel. Cadmium,
as an element, has excellent corrosion protection properties which have led to its use for the cadmium plating on aluminum
and steel products. Another reason is that cadmium plating on steel works well as opposed to the electroplating that you can
do on the steel. Even if the cadmium plating starts to corrode it has that white material formation which is helpful for various
dissembling of various products. As opposed to normal corrosion which is brown in color and can be a very tough task to disengage
materials which have been corroded. There has been a lot of debate as to whether the cadmium plating is dangerous to the environment
and is toxic. Cadmium plating in automotives is no longer used due to the availability of safer alternatives.
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