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#1 |
Registered User
Join Date: Jul 2009
Location: Jonesboro, AR
Posts: 410
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Sagging master cylinder
I'm trying to finish up my disc brake upgrade on my 68 gmc but keep running into challenges. I found yesterday that the booster is very close to the holly 4 bbl carb on the 292. My brand new 10" air cleaner will interfere and I'll have to modify the throttle linkage. I have a plan for those issues. Next I noticed that the booster/master cylinder assembly is sloping down toward the front. I don't know if that causes any problems with the functionality but I would prefer for it to be level. Should I shim the mounting bolts at the firewall to level it up? Any other suggestions? Thanks.
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#2 |
Registered User
Join Date: Nov 2014
Location: Bigfork, Montana
Posts: 1,137
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Re: Sagging master cylinder
It's mounted correctly. They all run down hill for some reason.
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#3 |
Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,561
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Re: Sagging master cylinder
Mine is 3/4 ton and is very similar in angle.
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#4 |
Registered User
Join Date: Jul 2009
Location: Jonesboro, AR
Posts: 410
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Re: Sagging master cylinder
Thanks for the input. It looks a little sad but as long as it works I'll leave it alone.
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#5 |
Senior Member
![]() Join Date: Nov 2012
Location: BY THE CAROLINA SEA
Posts: 920
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Re: Sagging master cylinder
I just had a disc conversion done on my 68, and my new master cylinder is a mile from the firewall now! No clearance issues with the breather because I put a smaller one on there.
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#6 |
Registered User
Join Date: Feb 2012
Location: Vinton, Va.
Posts: 493
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Re: Sagging master cylinder
By the way- Those stock brake lines will bend and fit nice if you're REAL careful. I just did mine. Just bend and don't twist. Good luck. Go slow and it'll work!!!!
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#7 |
Registered User
Join Date: Aug 2016
Location: Lake Forest, CA
Posts: 2,177
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Re: Sagging master cylinder
Only thing I don't like is that if you have any slight issue with the gasket for the cap, your frame rail is swimming in brake fluid.
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"Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC |
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#8 |
Registered User
Join Date: Mar 2006
Location: Latrobe, Pa. 15650
Posts: 344
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Re: Sagging master cylinder
Contact Captfab here on this web sight. He makes a bracket that eliminates the factory bracket that holds the booster to the firewall. My booster was close to the valve cover. By using his bracket, it lifts the booster away from the cover and it's more level. It also moves the booster closer to the firewall. By the look in your picture, it should move the booster back away from the carb.
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#9 |
Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Sagging master cylinder
If you keep it "as-is" there are two additional support bars that you seem to be missing.
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#10 |
Registered User
Join Date: Feb 2003
Location: Santa Ana, CA
Posts: 2,191
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Re: Sagging master cylinder
Is that really how the Holly mounts to the manifold? I'm not used to seeing a carb in that sideways orientation. If it where turned 90 degrees it sure would provide more room for the booster. If all else fails, swap in a hydro-boost unit and get rid of the chunky booster.
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