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11-05-2008, 09:15 PM
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#1 |
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Registered User
 Join Date: Oct 2008
Location: Searcy, AR
Posts: 92
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master cylinder leaks
My master cylinder leaks out the front/top of it. i have to fill it up quite frequently. anyway to stop this??? do i need to get some liquid silicone gasket maker???
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11-05-2008, 09:32 PM
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#2 |
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Out of the carpool lane.
Join Date: Jan 2000
Location: Clark Co, WA
Posts: 5,673
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Re: master cylinder leaks
Mine does as well on my '68 and just this past weekend I took the top off and took one of those (nail driver countersinking thingamabobs) and just hammered on the bottom side of the lid to push it up more and make the lid tighter. The holdowns on mine seemed kinda loose anyway, but not after I did this. I haven't driven it yet to know if it helped, but perhaps you can do this and let us know?
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1968 C-10 SWB, 5.7 Vortec/700R4/3.73 posi, Torch Red 1968 Camaro, 250/Powerglide, all original (No, I'm not gonna drop a 350 in it!...Jeez!) 2000 Honda VFR in the faster yellow! 2008 Husqvarna TE-610 1967 C-10 SWB 'Six Appeal'-Gone but not forgotten... |
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11-05-2008, 09:33 PM
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#3 |
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1969 Short, Fleet, and Beat
Join Date: Apr 2007
Location: Long Beach, Ca.
Posts: 867
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Re: master cylinder leaks
Is this a CPP master cylinder?
The best you can do is bend the wire clips to add additional pressure down on the cover for a tighter seal. Good luck. |
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11-05-2008, 09:44 PM
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#4 |
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,233
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Re: master cylinder leaks
umm there is a rubber gasket for them i installed a new mc and have no problems with leaks new mc was 15 buxs
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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11-05-2008, 09:54 PM
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#5 |
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Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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Re: master cylinder leaks
leaky master cylinders cause this....
 s/t
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1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. 
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11-05-2008, 09:56 PM
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#6 | |
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Dave's not here, man
Join Date: Jun 2004
Location: Winder, Georgia
Posts: 2,000
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Re: master cylinder leaks
Quote:
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- 2014 VW Jetta - 2015 VW Jetta - 1966 Ford F-250 |
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11-05-2008, 11:08 PM
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#7 |
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Registered User
Join Date: Oct 2008
Location: Searcy, AR
Posts: 92
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Re: master cylinder leaks
i have no gasket at all . where can i get one???
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11-05-2008, 11:36 PM
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#8 | |
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1969 Short, Fleet, and Beat
Join Date: Apr 2007
Location: Long Beach, Ca.
Posts: 867
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Re: master cylinder leaks
Quote:
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11-06-2008, 02:08 PM
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#9 | |
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Registered User
Join Date: Oct 2008
Location: Searcy, AR
Posts: 92
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Re: master cylinder leaks
Quote:
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11-06-2008, 02:09 PM
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#10 | |
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Registered User
Join Date: Oct 2008
Location: Searcy, AR
Posts: 92
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Re: master cylinder leaks
Quote:
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11-06-2008, 02:28 PM
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#11 |
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Registered User
Join Date: Dec 2006
Location: CA
Posts: 331
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Re: master cylinder leaks
Kragen or Napa has them in stock. Just take your cap in with you to make sure. I think they're like 5 bucks is all.
That will definitely be your fix. 
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11-06-2008, 02:43 PM
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#12 |
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Truck and auto performance nut
Join Date: Feb 2007
Location: McKinney,Texas
Posts: 3,848
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Re: master cylinder leaks
Mine was slightly bent so that even after buying and replacing the rubber it still leaked. So...I bought a new chrome cover somewhere that came with the rubber and the hold down bail, and slapped it on. No leaks since.
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Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken |
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11-06-2008, 02:53 PM
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#13 | |
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I wish I was a cowboy
Join Date: Apr 2008
Location: Rohnert Park, CA
Posts: 409
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Re: master cylinder leaks
Quote:
 You'd be amazed what some people patch together...even on brakes! If you haven't already, I'd do a pretty in depth study of all the brakes if you're going to drive it like this (but first get the m/c cap and/or gasket). Check rotors/pads/calipers/lines/hoses/ebrake/drums/shoes/springs. It sucks to be on the side of the road, but it sucks a lot worse to think your brakes are ok and sometime REALLY need them (and they not work!).
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-Kris Met list: Cyclone,Wilson,TranzAm,extd56,hotrodhomi,mnky30,Rokcrln,Brad,JerryJones(well, his truck anyway). |
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11-06-2008, 02:53 PM
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#14 |
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Senior Member
Join Date: Feb 2001
Location: Ridgecrest. CA, USA
Posts: 1,715
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Re: master cylinder leaks
On mine, I was getting leaking out of the filler cap area and a new black gasket didn't fix it. I had some make your own gasket, it was a rubber sheet that was just a little thicker than the OEM gasket. I cut out only what I needed and added it. My leak went away. This sheet of gasket is just like the stuff you buy for your water hose for outside, the orange ring gaskets already made, but in a sheet just like a piece of paper. I bought it at Home Depot. Good luck on your fix.
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Billy  1970 GMC Sierra Grande 402/TH400 (Longhorn)14 years and counting rebuild! 1975 (Build) Chevrolet SWB 4X4 350 SB Lifted 6 inches 1970 Ford F250 Ranger 390 BB 2010 Ford Super Duty F250 XLT W/4 inch lift kit and Pro Comp Tires Hub Cap Freak!    I need another truck like I need another hole in the head!I'M IN THE MARKET...AS IT WERE! |
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11-06-2008, 06:09 PM
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#15 |
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Registered User
Join Date: Oct 2008
Location: Searcy, AR
Posts: 92
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Re: master cylinder leaks
thanks alot guys i will check napa and see what i can do.
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11-09-2008, 03:40 AM
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#16 |
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Registered User
Join Date: Sep 2008
Location: Vancouver, Washington
Posts: 7
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Re: master cylinder leaks
I'm glad to see that I am not the only one dealing with this problem. I am going to bend the master cylinder bale wire and see if it takes the little bit of seepage that I'm getting. If not, then maybe a new gasket.
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11-09-2008, 11:40 AM
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#17 |
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I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: master cylinder leaks
Watch which gasket material you use.Some are not compatable with brake fluid.If you have a gasket and a leak I would sugest first replacing the gasket with a new one,making sure the flange is flat,then if it still leaks bend the bail to make the cap tighter.
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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