We're going to take a master cylinder off a wrecked 94 safari and put it
on a 92 GMC full size van. Since this master cylinder is used, does it
have to be bench bled, or can we just bleed all 4 bleeder valves? How
As long as the wrecked vehicle was not on its top (the reservoir full of
fluid) it should not need to be bench bled. You will probably need to bleed
all four bleeder valves, but sometimes as long as the system did not have
air in it from the old master cylinder it may just work. I've had a little
air work out on its own after a couple of days.
Years ago when I actually took courses in this sort of thing, you just
up in a vise, filled the cannister with fluid and actuated the plunger
fluid had fully circulated out of the master cylinder. You could use small
of curved brake tubing attached to the outlets of the master cylinder and
that the brake fluid was returned to the cannister.
I would do this if I were not sure that the fluid in the master cylinder
You dont want any water or particulates going into your brake system.
But even then, we would fully bleed and purge the system after the cylinder
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