Replacing master Cylinder/bleeding tricks

[EastRidge]

My P.O. had replaced the master cylinder, and it really started to leak out the boot. So, not to mess around, I ordered a new "correct" from Mid-West Military.

Looking at the install,.....are there ANY tricks in bleeding this off without tapping into all the brakes?

I noticed there is a small distribution block with a plug in the top on the inside of the frame. This plug looks like it hasn't moved since 1954.

Would it be worth the effort to remove this plug to aid in bleeding, or just have a bleeder open to hopefully send the air down one line?

Any related tips are greatly appreciated.
Thanks

 

[Barrman]

Are the brakes working perfectly with the current master cylinder? Except for the leak of course.

I ask because it is probable air has gotten in via the leaking piston seal and a good bleed of the entire system might be a good thing.

Bench bleeding the master cylinder is possible. Since it is a single line system all you really need is a plastic plug in the output line hole. Fill the master with fluid and push slow and soft. It will take about 3-5 full compressions before the piston will feel very firm when the master is held in a vice and you are pushing with a screwdriver. To avoid the mess, I used to do the bench bleeding on the vehicle.

Now, I use a Motive Products power bleeder. I screw air hose quick connect fittings into the bleeder and into the master cylinder cap. Pump it up to about 10 psi and just go to each corner and open the bleeders into a catch can. The link in my signature is to my YouTube channel. I have several brake bleeding videos posted.

 

[EastRidge]

Are the brakes working perfectly with the current master cylinder? Except for the leak of course.

I ask because it is probable air has gotten in via the leaking piston seal and a good bleed of the entire system might be a good thing.

Bench bleeding the master cylinder is possible. Since it is a single line system all you really need is a plastic plug in the output line hole. Fill the master with fluid and push slow and soft. It will take about 3-5 full compressions before the piston will feel very firm when the master is held in a vice and you are pushing with a screwdriver. To avoid the mess, I used to do the bench bleeding on the vehicle.

Now, I use a Motive Products power bleeder. I screw air hose quick connect fittings into the bleeder and into the master cylinder cap. Pump it up to about 10 psi and just go to each corner and open the bleeders into a catch can. The link in my signature is to my YouTube channel. I have several brake bleeding videos posted.

Your Signature did not appear on your reply....I am using my phone so maybe that's the issue.

 

[Barrman]

Here is a direct link to the channel:

Tim's Teachable Moments

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