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Dual Master Cylinder Bench Bleeding

  • Thread starter Thread starter geordie
  • Start date Start date Dec 21, 2007
G

geordie

Founding Member
May 10, 2002
576
2
19
Dec 21, 2007
#1
  • Dec 21, 2007
  • #1
I have a new dual brake master cylinder which I got from the PO when I bought the car about 5 years ago.
It came with a small bag with two threaded plastic male plugs, different sizes, and two plastic female plugs.
The bench bleeding instructions say to clamp the cylinder on a bench, install the bleeder plugs, half fill the reservoir, put the reservoir cover on and pump the plunger in .75 to 1.0 inch strokes until resistance is met.
I'm more familiar with the old tube method of bench bleeding. Is the method described above going to work?
 

Tim65GT

Active Member
Feb 24, 2004
1,149
2
39
West Texas
Dec 21, 2007
#2
  • Dec 21, 2007
  • #2
geordie
I'm more familiar with the old tube method of bench bleeding. Is the method described above going to work?
Click to expand...

I've only done it with the tubes fed back into the reservoirs also. With plugs in there, you'd think that some air would not make it out.

Either way, when you remove the plugs or tubes, air goes into the port openings

Once you feel resistance, i guess that means the air is out and the fluid is in.
 

Rusty67

20+ Year Stangneter
Dec 3, 2002
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109
LA, CA
Dec 21, 2007
#3
  • Dec 21, 2007
  • #3
I've done it this way and it works perfectly fine. I actually like it better except the fact that it is messy. Put a rag or a catch pan under the MC. You can actually do this in the car if you install the MC and jack the rear of the car so that the MC sits at a proper level for bleeding but again, with the mess its better to do this out of the car.
 
G

geordie

Founding Member
May 10, 2002
576
2
19
Dec 21, 2007
#4
  • Dec 21, 2007
  • #4
Why so messy?
Both ports are plugged and the cover is on the reservoir.
Does the fluid squirt out of the plastic plugs under pressure?
 

wild70stang

New Member
Nov 11, 2005
317
0
0
Dec 21, 2007
#5
  • Dec 21, 2007
  • #5
When I bench bled my new master cylinder it didnt leak, so not its not messy unless you dont tighten the pluggs and wave around the MC with the cover off. Also when pushing in the plunger, do this procedure while slightly tilting the MC up and down to get any remaining air bubbles out that might be caught.
 

Rusty67

20+ Year Stangneter
Dec 3, 2002
3,749
37
109
LA, CA
Dec 22, 2007
#6
  • Dec 22, 2007
  • #6
I've done 3 MC's this way. They have all leaked passed the plastic threads. I was only willing to tighten the plastic so much but I'm sure if it had been a brake line fiting it would not have leaked on me. Also, you have to remove the plugs. When you remove the plugs there is going to be some fluid to deal with.
 
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