littlebob
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While taking my Deuce apart I noticed this crimped off line, from what I can tell, it's connected to the air system. Anybody know what it went to?
littlebob
littlebob
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where did this go?
- Thread starter littlebob
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vent line from the fuel tank?
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That little line goes to the top of the master cylinder cap, its the vent line for fording ops
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Vent line from the cap of the master cylinder.
jasonjc
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You are better off the way it is 
red devils dude
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it's a vent there is a modification order cant remember off the top of
my head. my truck has one too.
my head. my truck has one too.
sermis
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My master vent is crimped like that. There is a petcock added to the top of the master cap which seales it. Does the cap need to be vented? I had some brake problems until I removed the master and cleaned all the gunk out. Now it will slide the 15.5's.
HeadWizard
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Speaking from recent experience, YES the master cylinder needs to be vented. I rebuilt the airpack (was cruddy so a good idea), checked all the wheel cylinders, flushed and bled the system and the da*n brakes still did not operated properly.
Rewind to the fact that the previous owner recently replaced the master and left the solid plug in the top (loose fitting) and forgot to tell me he moved the vent line. So I screwed up the brakes when I STUPIDLY did not think and closed up the top of the master cylinder TIGHTLY.
Drove great and stopped great for about a minute until I created a vacuum in the master, the dust boot sucked in and I almost took out the UPS guy because the pedal went hard as a rock!
Long answer and a learning lesson at the same time.
73 M35A2C now with brakes and for sale.
Don
Rewind to the fact that the previous owner recently replaced the master and left the solid plug in the top (loose fitting) and forgot to tell me he moved the vent line. So I screwed up the brakes when I STUPIDLY did not think and closed up the top of the master cylinder TIGHTLY.
Drove great and stopped great for about a minute until I created a vacuum in the master, the dust boot sucked in and I almost took out the UPS guy because the pedal went hard as a rock!
Long answer and a learning lesson at the same time.
73 M35A2C now with brakes and for sale.
Don
acetomatoco
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you can use a Differential vent in the cap.... The MWO was to take the vent off the air cleaner and bend a u in it and hang it on the firewall... There was a problem with MC Brake Fluid being sucked into the air cleaner under hard acceleration.... The air cleaner hookup for the vent was part of the....deep water fording capabilities.. ACE
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Problem with the "breather" valves is that they are one-way valves, try breathing through one.
rmgill
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The MWO involves separating the fuel and air pack vent lines from the fuel tank vent lines. This is a good thing to do. Fuel vapors are not so good for your master cylinder (run a bit of gasoline? What's it do to your airpack's seals?). I found the requisite parts at a local parts store. You need a plug and another tee fitting. Eventually, I'm going to add in another set of lines for the axle vents so I can get a good vent with those too.