OT Dodge truck brakes?

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Model T Ford Forum: Forum 2012: OT Dodge truck brakes?
Top of pagePrevious messageNext messageBottom of page Link to this message  By Steve Jelf, Parkerfield KS on Tuesday, November 27, 2012 - 10:14 am:

You know how it is when you're taking apart some spring loaded item and parts suddenly go flying all over? Don't you love it when that happens? Yeah, me too. So that's why I'm not sure about the order of the three parts on the left.



If these diagrams from the shop manual are clear enough, you can see that they show a different valve, with a spring and plunger. I suppose what I have is a later replacement version.





The problem here is that so far, whatever arrangement of the valve parts I try doesn't work. Shoving in the piston produces mostly air from the outlet, with a few drops of fluid. What should I be doing to get fluid from the outlet?

My first resort was to a Dodge truck forum, but it appears to have almost no traffic. There are a lot of posts from months or years ago asking questions, with never any reply. I hope somebody here happens to be familiar with this thing.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Roger Karlsson, southern Sweden on Tuesday, November 27, 2012 - 10:37 am:

It was 20 years ago I repaired the master cylinder on my '53 Dodge so I can't remember exactly how it fit together.. I'm sure someone here knows, but for other 30's-50's era Mopar questions this forum is quite active: http://www430.pair.com/p15d24/mopar_forum/index.php


Top of pagePrevious messageNext messageBottom of page Link to this message  By Royce in Dallas TX on Tuesday, November 27, 2012 - 11:02 am:

You need to bench bleed the master cylinder prior to installing it. You have the parts arranged properly. Just run a piece of clear plastic hose from the MC outlet into the reservoir. Pump until the air is gone. Then install the MC on the truck and bleed.


Top of pagePrevious messageNext messageBottom of page Link to this message  By David Dewey, N. California on Tuesday, November 27, 2012 - 12:55 pm:

I agree with Royce in that you have the parts in their proper order, but I don't think the three parts are supposed to be "parts" but one assembly--is it possible a spot weld gave way or?? It's been too long since I had MY '53 MC apart too.
Also the metal ring on the far right is usually vulcanized to the rubber cup. I would go by a REAL parts house and get a MC rebuild kit, as both questionable pieces will be in the kit! (that three piece assembly is pretty important to proper function of the brakes)
Also, make certain that hole "B" is open.
T'
David D.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mack Cole ---- Earth on Tuesday, November 27, 2012 - 01:15 pm:

If I aint mistaken the rubber peice with hole is fitted over the "stud" on the small metal peice and that is fitted behind the big 1.But I aint sure.
I have the old kit from my 47 pontiac handy,I will check it because it is very similar.
Steve,to touch on something else you said.This forum has MUCH more traffic than any of the other forums I am part of.The Planet Jr.Forum has about went the way of the dodo bird.


Top of pagePrevious messageNext messageBottom of page Link to this message  By David A. Siver on Tuesday, November 27, 2012 - 01:20 pm:

Haven't worked on that master cylinder but if one looks at item 14 of Fig 8 (valve assembly) it appears as if there is a spring on the back side of the valve. Steve you might want to check your pants cuff or boot for a loose spring. So maybe a rebuild kit for the MC would be in order.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mack Cole ---- Earth on Tuesday, November 27, 2012 - 01:35 pm:

Ok here is that stuff from my Dorman kit I bought a couple weeks ago.

note through the holes you can see the rubber.


hope this helps


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ken Kopsky, Lytle TX on Tuesday, November 27, 2012 - 01:52 pm:

That's probably the back-flow valve. You will need that unless the master cylinder has been retrofitted with valves/restrictors at the outlet connection(s). When you let-up on the pedal (or pump it), it restricts the fluid from being drawn from the lines instead of the reservoir. But it still allows a slow return from the lines.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Steve Jelf, Parkerfield KS on Tuesday, November 27, 2012 - 03:18 pm:

We all appreciate this forum for the wonderful abundance of Model T knowledge and experience. I appreciate it also for the wide range of other useful and interesting wisdom and information.

Thanks to Royce for the reminder about removing air from the MC before installing, and to Mack for the pictures of exactly the valve I have and confirming how it goes together. It's all finished and working. I didn't even have to bleed (except for a scrape on my hand). Now I'm back in business, ready to haul firewood up to the house.



Top of pagePrevious messageNext messageBottom of page Link to this message  By Mack Cole ---- Earth on Tuesday, November 27, 2012 - 04:31 pm:

Glad it helped sir.


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