You've got to isolate the problem.
Bleed off all the air and leave the drain valves on the tanks
both open to keep the air pressure at zero. Then try the brakes
(they'll still stop the truck but it will require increased pedal
effort). If the brakes don't stick the air/hydraulic booster
is at fault.
The line lock used in the 211 series allowed application of the
brakes when engaged but would not allow release. There is no
danger of not stopping because of inadvertent operation of the
unit. A terrifying skid is a very real possibility however....
YMMV.
-=-
--- Original Message ---
JJ&A <w7ls@blarg.net> Wrote on
Mon, 15 Jan 2001 22:56:57 -0800
------------------
Whilst trying to decode the symptoms of our brake problem, it
was
pointed out to me that there is a fluid solenoid in the hydraulic
lines
that is used to set the parking brake, if desired. If this were
sticking, such that there was only a small orifice to pump the
fluid
through, that might account for the sluggish return after releasing
the
brakes, couldn't it?.....
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