Bingo! My wrench (Art Shacklett) bled off the air, so we were running
without
pressure boost and the brakes acted fine, although he needed to press
really
hard on the brakes to stop the rig, as you would expect. Hence, the
problem
is now isolated to the airpack, as you suggested. It was rebuilt, or at
least
messed with, right before I took delivery. Looks like it wasn't done
right.
Do you have experience rebuilding the airpacks? Is this something
that an
average 'wrench' can tackle, or should we just get a rebuilt one?
Many thanks for pointing out this test, Buzz. It was spot on. Jim
buzz@toast.net wrote:
> 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?.....
>
> ===Mil-Veh is a member-supported mailing list===
> To unsubscribe, send e-mail to: <mil-veh-off@mil-veh.org>
> To switch to the DIGEST mode, send e-mail to <mil-veh-digest@mil-veh.org>
> To reach a human, contact <ack@mil-veh.org>
This archive was generated by hypermail 2b29 : Mon Feb 05 2001 - 07:13:48 PST