I had a new tandem master made by "Safe Line" that came with neither of
the small, (compensator?), ports drilled. The brake lights stayed on and
the car was hard to roll in the garage. I'm sure the brakes would have over
heated, if I had driven it very far. Those holes are supposed to let fluid
escape the cylinder and return to the reservoir, when the pedal is released.
Mine were countersunk, in the bottom of the reservoir, but not drilled all
the way through. They should be less than .040" in diameter. Because I
drilled mine with a .040" bit, (smallest I had handy), I get little
fountains in the reservoir when the pedal is released. That can make a
mess, when the cap is off. Of course you need to take the cylinder apart
before drilling; and clean the bore after.
Mike
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