Master Cylinder leak by?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sixty8chev · 07-07-2005, 11:47 PM

hey guys,
The fluid in the front chamber of my master cylinder has gone down a couple times, and I've got no leaks anywhere in the lines or at the wheels, So i'm assuming it is somehow leaking internally, I'm going to replace it this weekend but i'm just wondering if there is a possiblilty that it has leaked into my brake booster and might do any damage there, or if my diagnosis is even right.
The whole brake systems off a 76 but I'm pretty sure that its the same as 71-2's isn't it?

hotrodmtodd · 07-08-2005, 08:25 AM

The rear seal IS inside the booster. Good possibility you will find a good bit of fluid in there this weekend. Sounds like a good time to change back to the right set-up while you have it apart. Brakes is the ONE place you don't want to settle for cheap. Just my 2 cents worth. Take care, Mike

cdowns · 07-08-2005, 08:29 AM

if it's just the front section loosing fluid YOU"VE GOT A LEAK i'd bet on top of the crossmember

sixty8chev · 07-10-2005, 10:08 PM

Quote:

Originally Posted by hotrodmtodd

Sounds like a good time to change back to the right set-up while you have it apart.

What do you mean change it back to the "right" set up.
You want me to go back to manual master cylinder and 4 wheel drums.
Maybe i wasn't clear, the whole brake setup is off a 76 big block truck, right from the discs to the front lines, to the master cylinder and booster and it was all new about two years ago on that truck. I did the swap because I thought that was the "right" way to make the ones with drums stop.

07-07-2005, 11:47 PM	#1
sixty8chev The Sauz Join Date: Mar 2002 Location: Chilliwack BC, Canada Posts: 149	Master Cylinder leak by?? hey guys, The fluid in the front chamber of my master cylinder has gone down a couple times, and I've got no leaks anywhere in the lines or at the wheels, So i'm assuming it is somehow leaking internally, I'm going to replace it this weekend but i'm just wondering if there is a possiblilty that it has leaked into my brake booster and might do any damage there, or if my diagnosis is even right. The whole brake systems off a 76 but I'm pretty sure that its the same as 71-2's isn't it? __________________ 68 lwb 2wd (spread between 3 garages) 72 Burb - Flat Deck 92 Yukon 3" lift - 33's - the new bush pig 01 Sierra - Daily Driver (for now)

07-08-2005, 08:25 AM	#2
hotrodmtodd 'Burban Legend Join Date: Apr 2005 Location: Mingo Junction OH Posts: 918	Leak The rear seal IS inside the booster. Good possibility you will find a good bit of fluid in there this weekend. Sounds like a good time to change back to the right set-up while you have it apart. Brakes is the ONE place you don't want to settle for cheap. Just my 2 cents worth. Take care, Mike __________________ '67 Chevy Iron City Beer Truck (9ft step) '67 Chevy Panel Truck 467 '68 Short Fleet 305v6 '68 McLaren Ramp Truck '68/'68/'70/'71 Burbs 292/366/402/454 '69 C-30 dump '71 C-50 dump and church bus '71 4x4 454 '72 Blazer (w/pop-up camper) $15 x-hooks '66 Chevy II 194/Weber '68 El Camino" 305v6 '69 Skylark 455 Buick '70 Chevelle 427 '71 Cutlass W-31 '71 GTO 400 2x2 "The 51" Chopped '51 Chevy (409) my first car OK Toad, we'll take 'em all... John Milner

07-08-2005, 08:29 AM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	if it's just the front section loosing fluid YOU"VE GOT A LEAK i'd bet on top of the crossmember __________________ 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



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