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#1513902 08/21/2023 10:15 PM
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'Bolter
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I need to replace the master cylinder on my 1949 3100 and would appreciate and advice and suggestions. Thanks


1949 3100
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back yard wrench turner
back yard wrench turner
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bench bleed it 1st.


Wayne
1938 1-Ton Farm Truck
-30-
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'Bolter
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How do you do that?


1949 3100
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Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
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Install a piece of brake line on the outlet, run that back to the fill port and push the pushrod multiple times while the master is secured to a bench (vise).


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
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'Bolter
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You don’t need to bench bleed it first
Do you think the factory would be messing with dripping brake fluid?
And if you bench bleed it
Do you think you can install it without air bubbles in the master or the lines?
There are two holes in the master between the cylinder and the reservoir
You will not be able to trap air in the cylinder unless something is already wrong
Put the thing on dry and save a mess
Then bleed it on the truck
Just like the factory did
I’ve done this many times
It works every time
Do not over travel the piston
Do not install it from the wrong end
Just follow the instructions in the manual
And everything will work out perfect like magic
-s

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'Bolter
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As explained above just fill the MC with fluid, push the plunger as many times as it takes to purge the air--- until there's no more bubbles. Pictures below show a dual reservoir setup but the principle is the same. You'll just have one return line/hose instead of two.

Then put lid on MC and make sure you keep it level until installed.
Attachments
IMG_0919.JPEG (289.49 KB, 43 downloads)
master cylinder bench bleeding set-up
IMG_0920.JPEG (243.57 KB, 43 downloads)


Matthew 6:33

1952 Chevy 1/2-ton 3100
Late '55 235/SM420/torque tube 3.55
Dalton Highway survivor (using original 216)
www.truckwithaheart.com

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