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Author
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Topic: Master cylinder mystery
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V8 Thumper
Gearhead Posts: 3603
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 01-09-2003 11:12 PM
   
Tandem m/c out of an '83 Ranger in my '65. The pedal got soft the other day, popped the cap off only to find the front resivoir (rears) was damn near empty while the rear res was full to the gills 
After bleeding both channels, I sunk the pedal without the cap on it and watched a gyser out of the front res... the fluid is creeping under the resivoir seperating wall, filling up the rear and eventually sucking air in the front. Obviously I'll be getting a new cap and gasket, but why the gyser?------------------
1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9" All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html
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johnmustang
Gearhead Posts: 4727
From: British Columbia , Canada
Registered: Nov 2001
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posted 01-09-2003 11:32 PM
Purely a guess on my part, but, could it be back pressure and thats why the geyser ? JOHN  ------------------
65 2+2 FASTBACK
87 TAURUS WAGON
98 F150 XLT TRITON V8 4.6, 4 WHEEL DRIVE
Member:Vancouver Island Mustang Association
M&M #1710
MyPhotoPage
MY TRUCK
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Moneymaker
Administrator Posts: 19964
From: Lyons, IL, USA
Registered: May 99
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posted 01-09-2003 11:45 PM
It's sucking air when you release the pedal, then pushing it back out again. That's why they invented pressure bleeders.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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rockafellz
Gearhead Posts: 1329
From: San Lorenzo, CA, USA
Registered: Aug 2001
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posted 01-10-2003 02:13 AM
Hey Todd,We had that same problem with the '74 Maverick MC except it was leaking out the sides not internally. My dad bent the cap tensioner (is that the right word?) to keep the lid on tighter and now it keeps the fluid in there nice and tight!!  Erik ------------------
1966 Ford Mustang 2+2
Mine - Restomod in Progress 1966 Ford Mustang Coupe
Dad's - Original Unrestored
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Pierre
Gearhead Posts: 394
From: Near Paris, France
Registered: Apr 2002
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posted 01-10-2003 06:19 AM
Todd,
Having completely taken appart a M/C during my restoration project on my 67, sounds like a seal inside the master cylinder has failed causing the fluid under pressure from the front piston to burst into the front reservoir and then, fluid from that reservoir to be sucked-in the piston chamber & rear reservoir on the return of the pedal.
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Hell_Fish
Gearhead Posts: 680
From: Austin, TX.
Registered: May 2002
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posted 01-10-2003 08:36 AM
Fluid should shot up if the step on the pedal with the lid off. You are pushing all the fluid from the calipers into the MC, and with no lid it just shoots up. If you pump the brake slowly it will not shoot up as bad.
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Moneymaker
Administrator Posts: 19964
From: Lyons, IL, USA
Registered: May 99
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posted 01-10-2003 11:35 AM
I like to shoot fluid! ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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Pierre
Gearhead Posts: 394
From: Near Paris, France
Registered: Apr 2002
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posted 01-10-2003 01:25 PM
quote:
Originally posted by Moneymaker:
I like to shoot fluid!
That's because your seal is also busted 
I've had some cheap one break on me too
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Moneymaker
Administrator Posts: 19964
From: Lyons, IL, USA
Registered: May 99
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posted 01-10-2003 01:33 PM
 ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
IP: Logged |
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