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#1 |
Registered User
Join Date: Mar 2008
Location: Tucson Arizona
Posts: 264
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Master cylinder Firewall Hole
I've got a project Suburban that I have to make a master cylinder plate to cover the two holes in the firewall. This is a 1960 GMC. I do need to bore a hole for the brake master but since this sub is about 250 miles away from me I need to know the size hole to bore in the 1/4 inch plate...easier to do here in Tucson than there. Thanks Bob
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#2 |
One foot in front of the other
![]() Join Date: Aug 2008
Location: Parrottsville, TN
Posts: 5,440
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Re: Master cylinder Firewall Hole
Contact CaptainFab- I would think he could assist.
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#3 |
Senior Enthusiast
Join Date: Feb 2007
Location: Spokane Valley, WA
Posts: 8,356
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Re: Master cylinder Firewall Hole
Can’t confirm the hole diameter in the firewall, but I can confirm the hole in the plate sold by Master Power Brakes. It is 1 - 13/16” as shown in the attached photos. I ran this plate on my truck for a few years when I ran a Turbo 350 in my 1960 GMC. Eventually I went back to a manual 4 speed and fabricated a larger custom plate to accommodate the clutch master cylinder. If you want to save some effort you can have the plate for the cost of the shipping, or I can post a tracing of plate with dimensions if that’s helpful. If you’re interested shoot me a PM.
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#4 |
Registered User
Join Date: Nov 2008
Location: Lacombe, LA
Posts: 2,772
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Re: Master cylinder Firewall Hole
This is the plate from Capt. Fab.
It be pretty,arrrrrg (Pirate talk for Capt. Fab)
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http://s1299.photobucket.com/user/jb...23904108567829 |
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#5 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: Master cylinder Firewall Hole
Thanks for the plug guys
![]() The center hole in the plates that I make is 2-1/16". This is close in size to the hole in the firewall.
__________________
Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#6 |
Junior Member
Join Date: Feb 2005
Location: topeka, kansas
Posts: 258
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Re: Master cylinder Firewall Hole
Sorry to hijack - but why does the Power Booster have to be tilted up like that on these trucks? Is it a clearance problem with the engine or manifolds? The manual master cylinders sit square with the firewall so it can't be a brake rod alignment issue.
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_______________________________________ 62 SWB BBW (under construction) 86 Vette Convertible |
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#7 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: Master cylinder Firewall Hole
You know, I don't know of a reason for it other than keeping the master cylinder level, as some stock trucks were higher in the rear. But then if you look at the '67-'72 power brake setups, the master is tilted towards the front. Now the trucks starting in 1988, have the booster bolted directly to the firewall which positions the master basically cylinder level.
I designed my power brake booster brackets with a slight angle upwards simply because it just looks right to me.
__________________
Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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