Annoying brakes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Andy4639 · 03-28-2016, 08:30 PM

I had to replace the CCP proportioning valve last weekend while at the beach car show. The CCP proportioning valve had the plunger in the front of it with a rubber boot covering it. It blew the seal out of it and every time I stepped on the brakes it would shoot fluid out of it. I bought a new one and it doesn' have the front plunger. So any way here is the question for all of you.

The master cylinder is a after market one that I have no idea who makes it. I bought it used from a truck club member about 1.5 years ago. The problem is the lid moves around on it and the rubber gasket has about a 1/8" gap all around it. It leaks every time I drive it.

Tonight I hope I fixed it. I cut a piece of rubber gasket I had bigger than the lid so that it would over lay the master cylinder lip and with the lid in place it smashes it down good and tight. You can see the gasket in the pictures. I hope this has fixed it but wanted to hear what any of ya'll have done for this problem. If you have solved it by some other means please post them.
If this works I will take it back off and trim the gasket back to the edge.

68panelman · 03-29-2016, 07:24 AM

My 67 did this when I first got it. MC was new and I could not figure what was wrong. I "adjusted" the two hold down loops by pulling them sideways to have a tighter download on the cap. It did the trick. Worth a try Andy

Andy4639 · 03-29-2016, 07:27 AM

Quote:

Originally Posted by 68panelman

My 67 did this when I first got it. MC was new and I could not figure what was wrong. I "adjusted" the two hold down loops by pulling them sideways to have a tighter download on the cap. It did the trick. Worth a try Andy

I will see if I can get it any tighter. I drove it to work this morning so I'll see if it leaks any when I get home tonight.

72MARIO · 03-29-2016, 09:53 AM

The cover looks to small for the master cylinder. Are you sure its the correct cover ?

Custom 68 · 03-29-2016, 10:36 AM

I ended up buying a new "plastic" one and solved my issues. There are some nice aftermarket ones. CPP has one but I know you wont purchase from them, it is adjustable on all sorts of stuff.
http://www.classicperform.com/NewPro...V-1/MCPV-1.htm

Andy4639 · 03-29-2016, 11:14 AM

Quote:

Originally Posted by 72MARIO

The cover looks to small for the master cylinder. Are you sure its the correct cover ?

I bought it all together but that don't mean much! It's just the opposite though! With just the supplied gasket the lid will move all over the place on it. It's pretty sold right now but I don't know how long it will hold up.

67ChevyRedneck · 03-29-2016, 01:09 PM

Stop breaking your truck!

My mustang can't tow you in June

Andy4639 · 03-29-2016, 02:32 PM

Quote:

Originally Posted by 67ChevyRedneck

Stop breaking your truck!

My mustang can't tow you in June

Don't worry I have Hagerties it want have too!

swamp rat · 03-29-2016, 07:37 PM

I bought a replacement when i did my brakes that had that problem, the upper surface was faced down too far and the lid would not sit tight in the gasket, i returned it back to NAPA and got a free replacement.

Andy4639 · 03-29-2016, 07:55 PM

Drove the truck to work this morning and back home. Checked it out when I got home. No sign of leakage so hope I'm good.

swamp rat,
didn't buy anything from parts store. I bought everything form a friend almost 2 years ago. I did buy the new gasket but it was from a car show vendor. I may ride down to his shop in a couple of weeks to pick up a chrome 11" booster though. he told me if it didn't fix it to bring it back and he would give me my $5.00 back.

03-28-2016, 08:30 PM	#1
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Annoying brakes I had to replace the CCP proportioning valve last weekend while at the beach car show. The CCP proportioning valve had the plunger in the front of it with a rubber boot covering it. It blew the seal out of it and every time I stepped on the brakes it would shoot fluid out of it. I bought a new one and it doesn' have the front plunger. So any way here is the question for all of you. The master cylinder is a after market one that I have no idea who makes it. I bought it used from a truck club member about 1.5 years ago. The problem is the lid moves around on it and the rubber gasket has about a 1/8" gap all around it. It leaks every time I drive it. Tonight I hope I fixed it. I cut a piece of rubber gasket I had bigger than the lid so that it would over lay the master cylinder lip and with the lid in place it smashes it down good and tight. You can see the gasket in the pictures. I hope this has fixed it but wanted to hear what any of ya'll have done for this problem. If you have solved it by some other means please post them. If this works I will take it back off and trim the gasket back to the edge. Attached Images __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

03-29-2016, 07:24 AM	#2
68panelman Registered User Join Date: Jan 2011 Location: Delaware and Long Island, New York Posts: 3,456	Re: Annoying brakes My 67 did this when I first got it. MC was new and I could not figure what was wrong. I "adjusted" the two hold down loops by pulling them sideways to have a tighter download on the cap. It did the trick. Worth a try Andy

03-29-2016, 09:53 AM	#4
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	Re: Annoying brakes The cover looks to small for the master cylinder. Are you sure its the correct cover ? __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

03-29-2016, 10:36 AM	#5
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	Re: Annoying brakes I ended up buying a new "plastic" one and solved my issues. There are some nice aftermarket ones. CPP has one but I know you wont purchase from them, it is adjustable on all sorts of stuff. http://www.classicperform.com/NewPro...V-1/MCPV-1.htm __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

03-29-2016, 01:09 PM	#7
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: Annoying brakes Stop breaking your truck! My mustang can't tow you in June __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications!

03-29-2016, 07:37 PM	#9
swamp rat Registered User Join Date: Oct 2007 Location: Spanaway Posts: 8,451	Re: Annoying brakes I bought a replacement when i did my brakes that had that problem, the upper surface was faced down too far and the lid would not sit tight in the gasket, i returned it back to NAPA and got a free replacement. __________________ Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's

03-29-2016, 07:55 PM	#10
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Annoying brakes Drove the truck to work this morning and back home. Checked it out when I got home. No sign of leakage so hope I'm good. swamp rat, didn't buy anything from parts store. I bought everything form a friend almost 2 years ago. I did buy the new gasket but it was from a car show vendor. I may ride down to his shop in a couple of weeks to pick up a chrome 11" booster though. he told me if it didn't fix it to bring it back and he would give me my $5.00 back. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.



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