Master cylinder gasket question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Nodnarb76 · 06-17-2018, 03:55 PM

On my 87 3/4 ton Suburban, every time I remove my master cylinder cap, the two accordion style round pieces of the gasket are pushed out and down and extend down into the fluid.
When I take the cap off I push them back into place but whenever I check again they are down. Why does it do this and is it supposed to do this?

**Palf70Step** · 06-18-2018, 08:18 AM

They are doing their job to fill occupy space. Issue I am wondering is what causes it to always be that way. Almost sounds like you have a fluid leak in the system.

Pontiac1976 · 06-25-2018, 07:28 PM

AS said or fluid is low in tank. Another thing it could be. you got air in the brake system. or May be shoes wore down too much and or drums wore down too much.

06-17-2018, 03:55 PM	#1
Nodnarb76 Registered User Join Date: May 2013 Location: Mississippi Posts: 501	Master cylinder gasket question On my 87 3/4 ton Suburban, every time I remove my master cylinder cap, the two accordion style round pieces of the gasket are pushed out and down and extend down into the fluid. When I take the cap off I push them back into place but whenever I check again they are down. Why does it do this and is it supposed to do this? __________________ 1987 R20 Suburban LQ4/4L80e swap: http://67-72chevytrucks.com/vboard/s...d.php?t=693824

06-18-2018, 08:18 AM	#2
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,216	Re: Master cylinder gasket question They are doing their job to fill occupy space. Issue I am wondering is what causes it to always be that way. Almost sounds like you have a fluid leak in the system. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

06-25-2018, 07:28 PM	#3
Pontiac1976 Registered User Join Date: Oct 2015 Location: Ottawa, Ontario, Canada Posts: 766	Re: Master cylinder gasket question AS said or fluid is low in tank. Another thing it could be. you got air in the brake system. or May be shoes wore down too much and or drums wore down too much. __________________ 1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bed Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change.

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