John -
All anecdotal information. Lots of reports of folks that
had problems similar to Terry's. When they replaced the hoses, the problem went
away. Apparently, as the hoses deteriorate, the internals close up. Kind of act
like a check valve, causing the fluid not to immediately return to the
master cylinder. It's never happened to me. Just on the list of 'things to
check'.
Hoses are easy to replace. If shoes are locking against
the drums, then something is causing them not to release. If all the brakes are
locking up, it's likely a hydraulic issue instead of a mechanical one (for
example...weak or incorrectly mounted return springs, etc). Piston jamming in
the bore of the m/c is also worth considering. Create a checklist. Sort the list
by either 'most likely' to 'least likely' or 'easiest to fix/replace' to
'hardest to fix/replace'. Eliminate the items one at a time until problem
is solved.
Ron
----- Original Message -----
Sent: Monday, April 13, 2015 11:26
AM
Subject: RE: [Chrysler300] 300F
Brakes
Hi
Ron,
I never
understood that failure—have you ever REALLY seen it? brakes run at over 1000
psi, no way can an inwardly collapsed hose not open right up at 1000
psi? Opposite issue, burst is the failure mode? Yet I see this listed “as a
possibility” a lot? How can that collapse happen? ( think “collapsed” garden
hose—that is at 50 psi, water flow opens it) As an engineer, I cannot
believe it can stay blocked at 1000 psi.. And brake hose wall is very stiff,
does not just fall in? . My .02. If partially blocked, by junk?, maybe shoes
cannot pull back, but that would not lock brakes up, only drag them . Even
that I have trouble with ?
That being
said, very real problems with these brakes are at times really hard to solve.
Cams turned the wrong way are #1 on my experience. They will adjust that way,
but all wrong. And new standard arc shoes into oversize turned drums that do
not touch all the way around for 3000 miles, aggravated by overwinter rust as
Bob says. But really hard to trust it is OK, if it locks once or 5 times, and
then sort of stops locking.. Hate that.
I do not
claim to know answer,--- but to illustrate: I have been into RF wheel (only)
of 67 dart convert( not same brakes) at least 6 times now. Locks “once
in a while” , new drum shoes , small parts, even spindle( ?bent) . It has been
ok for a while. I suspect a small wheel cylinder leak once in great while,
dampens shoe? changed that too.
Thinking
about it, if one wheel, something is causing it, if 2 or 3, probably rust/self
energizing too much. 3 wheel cylinders will not spring leak at
once?
From:
Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf
Of 'Ron Waters' ronbo97@xxxxxxxxxxx [Chrysler300]
Sent: Monday,
April 06, 2015 2:37 PM
To:
Chrysler300@xxxxxxxxxxxxxxx
Subject: Re: [Chrysler300] 300F
Brakes
How old are
your brake hoses ? Sounds like they are collapsing internally, causing fluid
not to return to the master cylinder.
First
nice day here in Dayton OH, so I fired up the 300F to get it out of winter
storage. Engine started up just fine, but the brakes didn't.
When I apply the brakes normally, they totally lock up. Backing up,
by only a few inches, releases them, but normal stops again result in
lock up. Before I tear into the brakes, any suggestions about I might be
looking for? Terry
McTaggart
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