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#1423656 Sat Sep 11 2021 09:51 PM
Joined: Apr 2005
Posts: 10,795
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Received a new AC Delco single chamber master cylinder today. In the box was a red warning sticker that said “Warning Do Not Bench Bleed this master cylinder. If bench bled you will damage the cylinder.” I have never encountered this before. Could someone more knowledgeable than me explain? Thanks


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2) “Emily”
‘39 Dodge Businessmans Coupe “Clarence”



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USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)

Joined: Mar 2014
Posts: 2,901
J
'Bolter
I've never seen that warning, either. Wonder if they wanted you to vacuum bleed, pressure bleed or just install, fill and bleed the old school way?


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Joined: Apr 2005
Posts: 10,795
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
It would have been nice for instructions but those that came with it are for a dual M/C and say to bench bleed those. Confusing.

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Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2) “Emily”
‘39 Dodge Businessmans Coupe “Clarence”



"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)

Joined: Apr 2005
Posts: 10,795
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Installed and bled on the vehicle. Just takes a bit longer. I have a Mighty Vac that I will use tomorrow to really flush the lines out. Hopefully it’s cooler in the morning.


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2) “Emily”
‘39 Dodge Businessmans Coupe “Clarence”



"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)

Joined: Feb 2004
Posts: 24,563
H
Kettle Custodian (pot stirrer)
The most recent "bench bleed" method does not use the fittings and tubes to recirculate the fluid- - - -just use plastic plugs to stop off the outlet(s), clamp the MC in a vise, and gently move the piston about 1/4" or so repeatedly until the bubbles stop coming up into the reservoir. I can't imagine how a master cylinder could be damaged by doing that. It's just purging the air that's trapped ahead of the piston without actually circulating any fluid.
Jerry


"Freedom's just another word for nothing left to lose"
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Joined: Aug 2018
Posts: 649
2
'Bolter
If you over travel the piston inside you run the sensitive rubber seal into the threads and damage it
Then brake fluid leaks out the front of the device just enough to **** you off

The original master cylinder doesn’t need bench bleeding
There are two holes between the top reservoir so that airlock is not possible
The smaller of the two holes is often plugged after 70 years
I’ve installed a couple of the original master cylinders and never had a problem bleeding it installed on truck
-s


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