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08-18-2020, 06:08 PM | #1 |
Member
Join Date: Mar 2016
Location: Frisco, TX
Posts: 95
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Master cylinder fill cap
I'm trying to make an adapter for my master cylinder (M1050) so that I can use my pressure brake bleeder on it. I am having a heck of a time finding the thread type on the fill plug. I also see that some of the new master cylinders on the internet have what appears to be a removable plug inside the fill cap. Does anyone know the thread type for the fill plug? The information I had was 1 1/4 MNPT, but that is not correct. It is smaller than that and has much finer threads.
Two questions - 1. what is the correct thread type for the regular fill plug? and 2. does anyone have one with the removable plug in the filler? If so, is it a regular 1/4" NPT pipe fitting? Here is a link to the cylinder on which you can see the fill plug and cap. https://www.partsgeek.com/gbproducts...CABEgLyZfD_BwE Thanks, Ron Last edited by rbone; 08-18-2020 at 06:13 PM. |
08-18-2020, 10:48 PM | #2 |
Senior Member
Join Date: Oct 2011
Location: elmira,ny
Posts: 1,517
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Re: Master cylinder fill cap
if it like everything else, the co. can put just about any thread they want. could take the cap to a machine shop and have them check the thread and fab one for you.
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08-19-2020, 04:36 AM | #3 |
Senior Member
Join Date: May 2010
Location: Solihull, England.
Posts: 8,754
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Re: Master cylinder fill cap
I've pressure bled the ford cylinders by making a flat plate that I clamp over the opening. The plate has an 1/8 npt thread in it and a common barbed fitting in it. I use a piece of inner tube rubber between the plate and the reservoir. I have also used a plate on dual master cylinders with the large opening.
I can warn, though.. "Prepare for spillage". Mart. |
08-19-2020, 05:05 AM | #4 |
Senior Member
Join Date: Sep 2013
Location: Dighton, Mass
Posts: 1,230
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Re: Master cylinder fill cap
Marts way is the simple fast way. I remember those sold in auto part stores It had a
chain that went around the cylinder with a rubber gasket. |
08-19-2020, 06:37 PM | #5 |
Senior Member
Join Date: May 2010
Location: Ashland KY
Posts: 1,159
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Re: Master cylinder fill cap
I took cap from old MC or even new one and drilled a tap for 1/4 pipe,then used a compression fitting to apply air and fluid,,when done ,just removed the comp fitting and put a 1/4 pipe plug in BE SURE TO DRILL A SMALL VENT HOLE IN PIPE PLUG!!
I think I used another gasket on cap and really tightened it so no leaked,, couldn’t get it loose ,that why I left it there and used pipe plug, Like Mart said be prepared forleakes,,,after you get itplumed up ,just put about 15# air to see if it holds pressure before putting fluid in container,, I made my own bottle with a gauge and valve and reg,,worked great,best brakes I ever had on 35
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DON P |
08-19-2020, 06:52 PM | #6 |
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Join Date: May 2010
Posts: 2,871
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Re: Master cylinder fill cap
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