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Author Topic: Brake drag, and hot MC??  (Read 1384 times)

Steve

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Brake drag, and hot MC??
« Reply #15 on: July 24, 2010, 06:16:43 PM »

Maybe. . . .
 
I've never heard of a proportioning valve doing what you have. . .   Poor braking or one set working and not the others I've seen.
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Brian

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Brake drag, and hot MC??
« Reply #16 on: July 24, 2010, 07:13:12 PM »

I've been thinking about the proportioning valve, doesn't it have a
built in pressure regulator for the rear drums line?  So wouldn't it
then be impossible for the fluid to drain gravity style unless the check
 valve was over come?  Isn't this what the manual adjustable valve,
Willwood or whomever, would be doing?  So I would assume you wouldn't be
 able to "blow" through one of these aftermarket valves any more then
you should through the rear section of the stock proportioning valve?



Just some thoughts, I could be way off, or dead on...who knows.

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Brian

02 Chrysler Concorde Lxi
84 Dodge Crewcab, Cummins/5speed
68 Chrysler Station Wagon 440/auto
48 Desoto 2dr Sedan flat 6/3spd manual

Brian

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Brake drag, and hot MC??
« Reply #17 on: July 24, 2010, 08:28:39 PM »

Well I think I figured out what the problem is.....take a look at the pic.







The rusty one was the original one from the 71 300, and the shiny one is
 the "new" repro one.  I never thought much about why it had that
additional cylinder on the rear brake section, but after disassembling
the proportioning valve this evening I'm convinced that it's a RPV valve
 like Jass warned me about.  Inside that cylinder is a plunger with a
seal on it, and a heavy spring, and then the cap.  When everything is
installed properly you can not blow through to the rear line, remove the
 valve and it's a flow through.



I checked a couple proportioning valves I have, all from the mid to late
 80's, and none of them have that residual pressure valve set-up, nor do
 ol' blue (87 dodge ram) or RAE (dodge crewcab).  So I think I'll either
 remove the RPV valve and run with it that way, or install one of the
older prop. valves I have kicking around.



Also when I removed the 3 year old flex line from the car, I can barely
blow through the line in one direction, towards the rear wheel
cylinders. But back through the other way, so back towards the MC, I
have no restriction.  So I guess the flex line was a culprit as well.
The new line blows clear either direction.


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Brian

02 Chrysler Concorde Lxi
84 Dodge Crewcab, Cummins/5speed
68 Chrysler Station Wagon 440/auto
48 Desoto 2dr Sedan flat 6/3spd manual

Steve

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Brake drag, and hot MC??
« Reply #18 on: July 24, 2010, 08:48:45 PM »

MMMMMM
 
I was under the assumption this just happened after using them for a while.
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Brian

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Brake drag, and hot MC??
« Reply #19 on: July 27, 2010, 09:18:28 AM »

Well yesterday was an ordeal....I decided to loose the stock proportioning valve and plumb the front discs straight into the MC and then plumb in an adjustable brake valve for the rears.

Thanks goodness for car guy neighbors!!  I
 was about at my wits end after the day I had trying to get everything
plumbed up and working, and then not being able to bleed the brakes after all that and I was beside myself!!!

I was cooked in the 37* (104*) weather
here yesterday, and I couldn't think straight anymore.  I went over and got
my neighbor and asked if he could come help me think this through.  It
was his idea to start at the MC and open every fitting to check for
fluid, turned out some crap got jammed up in the new adjustable valve, I
 had it set at 50/50 like the instructions said, but after pulling it I
got some sludge and crap out of it by blowing back through.  I then
decided to open it all the way until I finished bleeding the brakes.
Got it all bled, and even got the wagon out and took it up and down the
street, brakes well, will probably need to fine tune it but it's set at
the halfway point, as per the instructions, and that seems to be good
enough for now.



I'm a much happier camper now....

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Brian

02 Chrysler Concorde Lxi
84 Dodge Crewcab, Cummins/5speed
68 Chrysler Station Wagon 440/auto
48 Desoto 2dr Sedan flat 6/3spd manual

Steve

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Brake drag, and hot MC??
« Reply #20 on: July 27, 2010, 09:39:27 AM »

MMMMM
 
Didn't I say contaminated?
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Brian

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Brake drag, and hot MC??
« Reply #21 on: August 04, 2010, 10:35:04 PM »

Well I thought I'd update things a little more now that I'm home from my
 vacation with the wagon.  I almost didn't get to take the wagon.  We
loaded up and left the house, wife wanted to stop at Tim Horton's first,
 so parked and things didn't feel right.  The wagon's brakes were
dragging, I adjusted the rear valve off all the way, still dragging, in
fact it was taking 1100rpm to get the car to move!!  Decided to go home
and work on it for an hour and see if I could fix it, if not then we
would have taken the wife's 02 Concorde.



On the drive back home, 10 miles or so, the brakes got so hot you could
smell them in the car, and it was taking more and more power from the
big ol' 440 just to keep it moving down the road. Got home and jacked
the front end up, the front wheels wouldn't move!!  So I figured it must
 be a MC problem.



I loosened off the MC low and behold the front wheels spun! So obviously
 I set the push rod length too long.  I backed the push rod off about
3/16 and bolted things back together, took it around the block and all
was well.  Loaded up the family and headed for the hills.  No problems
with the braking system on the trip, other then my warped front rotors,
but still have to fine tune the rear brakes.


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Brian

02 Chrysler Concorde Lxi
84 Dodge Crewcab, Cummins/5speed
68 Chrysler Station Wagon 440/auto
48 Desoto 2dr Sedan flat 6/3spd manual

Stan Paralikis

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Brake drag, and hot MC??
« Reply #22 on: August 05, 2010, 02:24:04 AM »


Plus.... You're on vacation and the first thing you go to is Tim Horton's  

300rag

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Brake drag, and hot MC??
« Reply #23 on: August 05, 2010, 06:24:20 AM »

Good on finally getting it fixed
 
 
Quote from: Commando1



 
 
Obvious to me you are not in tune with the Canuck way of life
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1965 Chrysler 300 convertible 413/ 4 speed ; 1969 Monaco 3-seat wagon 383/727 ; 1969 Monaco 500 2-door 318/727

Brian

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Brake drag, and hot MC??
« Reply #24 on: August 05, 2010, 08:06:57 AM »


Good on finally getting it fixed
 
 
Quote from: Commando1




 
 
[/QUOTE]

The bigger joke is that I work for Tim Hortons...I deliver the goods to the stores in this.....





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Brian

02 Chrysler Concorde Lxi
84 Dodge Crewcab, Cummins/5speed
68 Chrysler Station Wagon 440/auto
48 Desoto 2dr Sedan flat 6/3spd manual

Stan Paralikis

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Brake drag, and hot MC??
« Reply #25 on: August 05, 2010, 08:28:55 AM »


Quote from: thrashingcows
...I deliver the goods to the stores in this.....
When's your company going to get you one of those new "Mad Max"  Internationals.

Steve

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Brake drag, and hot MC??
« Reply #26 on: August 05, 2010, 09:10:29 AM »

I see Hortons is selling corn too.  (Corn Binders)
 
He needs one of those new Internationals with that funky looking grill.  It looks like something out of the movies.  Wouldn't be surprised if that's where it came from
 

 
 

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Brian

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Brake drag, and hot MC??
« Reply #27 on: August 05, 2010, 10:37:26 AM »


Quote from: Commando1
Quote from: thrashingcows
...I deliver the goods to the stores in this.....

They've gone to all Volvo now...our binders are the last in the fleet, but I'd love one of those Lone Star binders!!

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Brian

02 Chrysler Concorde Lxi
84 Dodge Crewcab, Cummins/5speed
68 Chrysler Station Wagon 440/auto
48 Desoto 2dr Sedan flat 6/3spd manual

Steve

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Brake drag, and hot MC??
« Reply #28 on: August 05, 2010, 12:31:34 PM »

I don't hear too many good things about the Volvos
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Brian

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Brake drag, and hot MC??
« Reply #29 on: August 05, 2010, 12:56:48 PM »


Quote from: POLARACO
I don't hear too many good things about the Volvos

You got that right...We have 2 right now and they have been inthe shop more then they have been on the road....and we warned them about the Volvo reputation.  But hey we're just dumb truck drivers so what could we possibly know.

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Brian

02 Chrysler Concorde Lxi
84 Dodge Crewcab, Cummins/5speed
68 Chrysler Station Wagon 440/auto
48 Desoto 2dr Sedan flat 6/3spd manual

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