Over in another automotive universe (porsche 911), they worry about pumping
the pedal to bleed brakes because this tends to force the seals in
the master to go into the area of the bore that is not usually "wet",
but rather may have corroded - and that corrosion may damage the seals.
I'd never heard of this concern before, and it seems a bit bogus,
but I'm passing it along.
Many years back I learned a completely different method for bleeding,
which requires only patience and gravity: fill the master, and
attach to the bleed nipple at the "farthest" slave a long clear tube
which is taped upward on the car, so the end of the tube is higher
than the reservoir. Open the bleed. Wait until the level in the
tube is about the same as the reservoir. Close the bleed, repeat
at the other three wheels.
You can do all four at once this way. I usually use a pair of
bleed bottles, doing one axle at a time: I arrange the tube going
into the bottle so there's a high point where I can watch the
bubbles. This version requires that I pay attention to the fluid
level in the master, though.
Best,
chris
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