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#1245123 11/29/2017 2:49 PM
Joined: Dec 2014
Posts: 357
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'Bolter
'Bolter
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Posts: 357
I've never done this. How's it done?


Julian Carter

1970 Triumph GT6
1967 Triumph TR4A
1952 Chevy 3600
1948 MG-TC
Joined: Feb 2004
Posts: 29,774
H
Kettle Custodian (pot stirrer)
Kettle Custodian (pot stirrer)
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Joined: Feb 2004
Posts: 29,774
We used to use a short piece of plastic tubing to recirculate the fluid from the output port(s) back to the reservoir and purge as much of the air out of the piston bore as possible. Now most MC's come with a couple of plastic plugs for the output ports and the piston is cycled through a very short stroke repeatedly until bubbles stop appearing at the pressure relief port that gets uncovered at the very back end of the piston travel. Hold the cylinder in a vise and stroke the piston 1/2" or so a couple of dozen times to purge the air out of the cylinder bore, then bolt the cylinder into place and quickly connect the line(s). Then the wheel cylinders need to be bled to remove any air that gets trapped in the brake lines during the master cylinder swap. A set of "speed bleeder" screws with a one-way check valve at the wheel cylinders makes the process a one-man operation most of the time.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
Joined: Dec 2014
Posts: 357
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'Bolter
'Bolter
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Posts: 357
Thanks Jerry

In the 45 years I've got driving little British Cars. I've never even heard of this...


Julian Carter

1970 Triumph GT6
1967 Triumph TR4A
1952 Chevy 3600
1948 MG-TC
Joined: Feb 2004
Posts: 29,774
H
Kettle Custodian (pot stirrer)
Kettle Custodian (pot stirrer)
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Joined: Feb 2004
Posts: 29,774
The Little Brit Cars I used to work on had master cylinders with a bore and stroke approximately equal to a Tootsie Roll- - - - -no real need to bench bleed 'em! LOL!
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
Joined: Sep 2001
Posts: 29,269
Bubba - Curmudgeon
Bubba - Curmudgeon
Joined: Sep 2001
Posts: 29,269
Savannah54 / Julian,

Are you referring to a 1952 or 1954 original style 3100 or 3600 master cylinder (the only pertinent clues in your title and footer-signature).

Or, are you referring to a modification dual chamber master cylinder for what vehicle?

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'Bolter
'Bolter
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Posts: 357
Tim, I was talking about My 3600 (52.) But my question included all that I'd worked on and driven. My 3600 will have a master cylinder from the Holister Road Co. Because of my 4 wheel disc brakes

With a valve to put more pressure to the front wheels.


Julian Carter

1970 Triumph GT6
1967 Triumph TR4A
1952 Chevy 3600
1948 MG-TC
Joined: Sep 2001
Posts: 29,269
Bubba - Curmudgeon
Bubba - Curmudgeon
Joined: Sep 2001
Posts: 29,269
Julian,

Most likely it is a dual chamber master cylinder?

If it is, people here should be able to describe how to bench bleed it (this would not be described in an old truck manual). And/or, people here might post a link to a page that describes how to bench bleed, or post a link to a Youtube demonstration?

Joined: Feb 2004
Posts: 29,774
H
Kettle Custodian (pot stirrer)
Kettle Custodian (pot stirrer)
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Joined: Feb 2004
Posts: 29,774
The bench bleeding procedure I described above will work on just about any master cylinder single or double outlet- - - -simply plug the output port(s), fill the reservoir with fluid, and short-stroke the piston until bubbles stop appearing in the reservoir.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
Joined: Mar 2010
Posts: 843
Y
yar Offline
Shop Shark
Shop Shark
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Joined: Mar 2010
Posts: 843
Julian,

Here's a video showing how to do it:



Ray
Joined: Feb 2004
Posts: 29,774
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Kettle Custodian (pot stirrer)
Kettle Custodian (pot stirrer)
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Joined: Feb 2004
Posts: 29,774
That procedure is ineffective, messy, and at least 20 years out of date.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
Joined: Dec 2014
Posts: 357
S
'Bolter
'Bolter
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Joined: Dec 2014
Posts: 357
Thanks All Y'al, Jerry, Every time you say something I'm searching for a new tool. It's Great So far I've gotten a new timing light, a screwdriver socket for my tie bar and now I'm looking for "speed Bleed screws".
It's great reading all that you've got to input here THANKS!!

I've driven little cars all my life. This Truck is my first Big Vehicle it fi, being 6 cylinder. Cause I've never owned a V8 and want'a stay that way. I Love the turns.


Julian Carter

1970 Triumph GT6
1967 Triumph TR4A
1952 Chevy 3600
1948 MG-TC

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