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Old 07-18-2016, 04:19 AM   #1
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How do I bench bleed a brake master cylinder with 4 ports?

So I am replacing my brake master cylinder, as mentioned in my post titled "Brake Problems", and my new master cylinder is getting delivered on Friday. I did my research and know how to bench bleed the new cylinder before installing it. However, every video and article is for master cylinders with only 2 ports. My 03 2.3L's master cylinder has 4 ports so how would I go about bench bleeding it? Also noting, the bleed kits come with only 2 hoses.


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Old 07-18-2016, 04:21 PM   #2
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Its been years since I have bleed a four port master cylinder; the old French cars (Simca, Peugeot, Renault) all used have four ports. Now, don't hold me to this, but, as I remember, you plug all four ports on the master with screws or better yet, the proper brass fittings and place the master in the vise. (don't over tighten the vise around the master... used to use two pieces of wood around the jaws of the vise and place the master between them and secured it just enough to hold it). Then using a push rod or something like that push the rod in and release slowly until you saw no more bubbles coming thru the vent port holes in the master. It is a time consuming process, so have some patience otherwise you won't get all the air out. Hope this helps, a car nut.

Last edited by a car nut; 07-18-2016 at 04:23 PM. Reason: correct spelling....
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Old 07-18-2016, 10:22 PM   #3
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This ^^^^^^^^^^
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Old 07-19-2016, 12:58 AM   #4
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Originally Posted by a car nut View Post
Its been years since I have bleed a four port master cylinder; the old French cars (Simca, Peugeot, Renault) all used have four ports. Now, don't hold me to this, but, as I remember, you plug all four ports on the master with screws or better yet, the proper brass fittings and place the master in the vise. (don't over tighten the vise around the master... used to use two pieces of wood around the jaws of the vise and place the master between them and secured it just enough to hold it). Then using a push rod or something like that push the rod in and release slowly until you saw no more bubbles coming thru the vent port holes in the master. It is a time consuming process, so have some patience otherwise you won't get all the air out. Hope this helps, a car nut.
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This ^^^^^^^^^^
Thanks! Can I basically just do it like in this video, by plugging all four with fingers? (Skip to 5:45)
https://youtu.be/trotrlIG2sk
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Old 07-19-2016, 07:48 AM   #5
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'It is a time consuming process...'

I can imagine, say a hundred years or so.

If you BLOCK PORTS with a plug HOW IS AIR GOING TO GET OUT?

You block ONLY when letting the MC cylinder piston extend back out, if you block going in then you are defeating your effort there. Blocking going out forces vacuum to bypass the rubber piston seal sides to fill fluid. You're using fingers or whatever to replace the for pennies one way check valves nobody puts in MCs any more due to being the money grubbing utter bastards the company CEOS are now.

Hoses will work but need FOUR of them and of course you are not supplied with that on cheap Chinese parts, lucky to even get two now. Same reason as above. The hoses really should be made of metal so bendable, you then bend them to go in MC and the ends go below the fluid level to bleed faster, you look at them for bubbles just like the MC supply port. Bled when no more bubbles. I can do one in usually 60 seconds or something is wrong with it. You THEN plug the holes until needed to prevent fluid running out as the part get tilted this way and that installing it.

Standard auto repair procedure since the '50s boys...................
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Old 07-19-2016, 04:59 PM   #6
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Quote:
Originally Posted by amc49 View Post
'It is a time consuming process...'

I can imagine, say a hundred years or so.

If you BLOCK PORTS with a plug HOW IS AIR GOING TO GET OUT?

You block ONLY when letting the MC cylinder piston extend back out, if you block going in then you are defeating your effort there. Blocking going out forces vacuum to bypass the rubber piston seal sides to fill fluid. You're using fingers or whatever to replace the for pennies one way check valves nobody puts in MCs any more due to being the money grubbing utter bastards the company CEOS are now.

Hoses will work but need FOUR of them and of course you are not supplied with that on cheap Chinese parts, lucky to even get two now. Same reason as above. The hoses really should be made of metal so bendable, you then bend them to go in MC and the ends go below the fluid level to bleed faster, you look at them for bubbles just like the MC supply port. Bled when no more bubbles. I can do one in usually 60 seconds or something is wrong with it. You THEN plug the holes until needed to prevent fluid running out as the part get tilted this way and that installing it.

Standard auto repair procedure since the '50s boys...................
Thanks for the helpful info AMC. I already bought one bleeder kit with 2 hoses and 2 plugs so I should just get 2 more hoses and 2 more plugs and do it how you normally would?
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Old 07-19-2016, 10:15 PM   #7
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That would do it yes..................
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Old 07-20-2016, 08:33 PM   #8
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I wanted to respond to listing about blocking the ports on the master cylinder as a method of bleeding the master. Blocking the output ports on the master cylinder is an accepted method of bench bleeding the master cylinder. I wanted to be sure that my memory wasn't foggy, so I spent some time going thru my collection of service materials that I've collected over many years. Sadly, I could not find the Peugeot, Simca or Renault service manuals, guess I gave that stuff away years ago.... But I do remember that one of those manufacturers used to call for blocking the output ports on the master cylinder.

A quick search on Google verified that blocking the output ports on the master cylinder is an acceptable method of bench bleeding a master cylinder and both Raybestos and A1cardone list it as well as some websites: performance on line and Mopar Turbo have info about the procedure.

At this point it isn't an issue, but because of the response I wanted to be sure that what I had said about it was basically correct.

Oh, and by the way, does anyone need a (what I believe is) NOS 1969 Lockheed Simca master cylinder (I found it when searching for the service manuals!) And, I found other items that I haven't seen in years. So, if any of you are looking National service data from the 1970's and late 1980's I have it!
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Old 07-22-2016, 03:20 AM   #9
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Quote:
Originally Posted by a car nut View Post
I wanted to respond to listing about blocking the ports on the master cylinder as a method of bleeding the master. Blocking the output ports on the master cylinder is an accepted method of bench bleeding the master cylinder. I wanted to be sure that my memory wasn't foggy, so I spent some time going thru my collection of service materials that I've collected over many years. Sadly, I could not find the Peugeot, Simca or Renault service manuals, guess I gave that stuff away years ago.... But I do remember that one of those manufacturers used to call for blocking the output ports on the master cylinder.

A quick search on Google verified that blocking the output ports on the master cylinder is an acceptable method of bench bleeding a master cylinder and both Raybestos and A1cardone list it as well as some websites: performance on line and Mopar Turbo have info about the procedure.

At this point it isn't an issue, but because of the response I wanted to be sure that what I had said about it was basically correct.

Oh, and by the way, does anyone need a (what I believe is) NOS 1969 Lockheed Simca master cylinder (I found it when searching for the service manuals!) And, I found other items that I haven't seen in years. So, if any of you are looking National service data from the 1970's and late 1980's I have it!
Thanks for following up on your previous statement, I appreciate the extra effort of looking for those old manuals! I just finished the job about 45 minutes ago (I know it's late) using 2 bleeder kits. It was a huge pain in the @$$ because two of the ports have adapters that change the size of the ports for some reason
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Old 07-22-2016, 03:21 AM   #10
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The job is all done everyone :)
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