Mysterious master cylinder leak - The 1947 - Present Chevrolet & GMC Truck Message Board Network

our64 · 02-27-2004, 09:47 PM

I have a mid 80's chev dual MC on my truck . I totaly cleaned the outside and let the truck sit. Even with the level approx 3/16 from the top it seeps out from between the lid and body. I don't know how...Any thoughts. Besides seaking medical help

midyearvet@aol. · 02-27-2004, 10:16 PM

Either the rubber seal in the top is bad Or you still have it to full

cdowns · 02-28-2004, 12:18 AM

sometimes taking 200grit sandpaper and lightly sanding the top of the master will cure the problem

**passthebuck** · 02-28-2004, 01:22 AM

my 79 had the same problem. I changed the cover gasket & the leak stopped. I got a good quality one from GM because I didnt want any hassles with a cheap offshore one.

1-PU70 · 02-29-2004, 10:10 PM

Try the fine sandpaper. I puy it on a small piece of 2x4. You will see the low spots fast. Use some paper towel to soak up the break fluid then stuf some in there to keep the dirt out.

02-27-2004, 09:47 PM	#1
our64 http://public.fotki.com/street Join Date: Nov 2002 Location: Winnipeg, Canada Posts: 169	Mysterious master cylinder leak I have a mid 80's chev dual MC on my truck . I totaly cleaned the outside and let the truck sit. Even with the level approx 3/16 from the top it seeps out from between the lid and body. I don't know how...Any thoughts. Besides seaking medical help

02-27-2004, 10:16 PM	#2
midyearvet@aol. Registered User Join Date: Jun 2003 Location: Napa, Ca. Posts: 103	Leaky master cylinder Either the rubber seal in the top is bad Or you still have it to full

02-28-2004, 12:18 AM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	sometimes taking 200grit sandpaper and lightly sanding the top of the master will cure the problem __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

02-28-2004, 01:22 AM	#4
passthebuck Sisyphus was my mentor! Join Date: Sep 2002 Location: Carleton Place, Ontario CANADA Posts: 984	my 79 had the same problem. I changed the cover gasket & the leak stopped. I got a good quality one from GM because I didnt want any hassles with a cheap offshore one. __________________ passthebuck #5642 -TWO 1967 GMC 910's. One with L6/3-on-the tree and the other with 355 w/435hp & a 700r4. -a 2013 Honda Civic as my "sensible" car

02-29-2004, 10:10 PM	#5
1-PU70 Registered User Join Date: Apr 2000 Location: Bradenton, FL Posts: 1,036	Try the fine sandpaper. I puy it on a small piece of 2x4. You will see the low spots fast. Use some paper towel to soak up the break fluid then stuf some in there to keep the dirt out. __________________ 1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters

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