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#1 |
Registered User
Join Date: Dec 2006
Location: Fredericksburg, VA
Posts: 71
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Need help with Master Cylinder problem!
My master cylinder is leaking fluid from under the fluid cover. The cover itself looks brand new. The gasket looks decent as well. Could it be the wrong size fluid cap? It looks to be a little bigger than it should be. The master cylinder is a Delco Moraine. Thanks for the help.
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#2 |
Registered User
Join Date: Oct 2005
Location: Northern Arkansas
Posts: 1,131
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Re: Need help with Master Cylinder problem!
I had the same problem on my wife's truck. I got a new chrome lid and bail, and a new gasket, problem fixed.
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#3 |
Registered User
![]() Join Date: Jun 2006
Location: Michigan
Posts: 530
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Re: Need help with Master Cylinder problem!
Having the same problem. Everything new..Have a leak under the cover and eating the paint off my inner fender..Once leak is fixed i will take the inner fender out and repaint.
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#4 |
Registered User
![]() Join Date: Jun 2006
Location: Michigan
Posts: 530
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Re: Need help with Master Cylinder problem!
Anyone one else have this problem?
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#5 |
Registered User
Join Date: Jan 2011
Location: Redmond, OR
Posts: 758
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Re: Need help with Master Cylinder problem!
I had the same problem. Went to NAPA to get a new cover gasket, and it didn't fit right - too big. Ended up trimming it to fit and it still leaked.
Seems to have a slight forward tilt after I installed my power booster. I just run it about 2/3 full instead of fully topped off, and it seems to have stopped.
__________________
68 Chev C20- son has it now 83 K20 - bought from son 70 C20 - in progress |
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#6 |
Active Member
![]() Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: Need help with Master Cylinder problem!
^ Yeah, don't fill all the way to the top. If the brakes are adjusted properly, and lines bled it doesn't take much fluid to operate the brakes. Hydraulic fluid doesn't compress but it can expand with heat.
I've had the same problem before and most of the time it was the cap and/or gasket. Carefully check the top edge of the master cylinder with a flat ruler and a feeler gauge for any low or high spots. If it looks good then it's either the gasket or cap. Don't overfill! |
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#7 |
Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,143
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Re: Need help with Master Cylinder problem!
Having the same problem. New cover & gasket did not help. Annoying.
__________________
1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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#8 |
Registered User
![]() Join Date: Jun 2006
Location: Michigan
Posts: 530
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Re: Need help with Master Cylinder problem!
going to try a new cover and two new metal attaching rods. Mine are lose!!
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#9 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,004
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Re: Need help with Master Cylinder problem!
Make sure the mounting surface on the M/C is clean and smooth, otherwise it will leak. Lightly sanding it helps. I also agree with not filling it all the way to the top.
__________________
1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#10 |
Registered User
Join Date: Jan 2009
Location: South Carolina
Posts: 262
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Re: Need help with Master Cylinder problem!
Have the same leak . Put on a new top without much help .
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#11 | |
Registered User
Join Date: Aug 2005
Location: Pasadena,Tx /Pto Pta DR
Posts: 5,415
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Re: Need help with Master Cylinder problem!
Quote:
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#12 |
Registered User
![]() Join Date: Jun 2006
Location: Michigan
Posts: 530
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Re: Need help with Master Cylinder problem!
Checked surface of the master cylinder where it seals. Has no pits and very smooth. I checked to see if the surface was flat with a big file. Looks good. fluid it at proper lever. Will brake fluid eat rtv?
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