Master cylinder to fit 8" dual booster - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-01-2005, 09:06 PM
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Master cylinder to fit 8" dual booster

Hi, what would be a good off the shelf large diameter, dual Master cylinder that will fit on to an 8" dual diaphram booster.This is one of the after market one's and the opening on the M.C. end where the M.C. slips into to "hookup" to the pin is to small for the aluminum S10 one that I had planned on using.This is for a front disc conversion on a 57 Buick which is a heavy car, so need a good sized master cylinder. This aluminum master is metric but is more than 1" bore.

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Old 02-02-2005, 11:16 AM
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Late sixties big block Vette (67-69), they are availiable for either all disc, power or not.

Vince
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Old 02-02-2005, 11:35 AM
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What is the 8" dual diaphram booster from?

GM changed to metric MC's in ~'82. If the s10 one (metric) didn't fit you will most likely have to use a pre '82 MC.
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Old 02-02-2005, 06:19 PM
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Triaged, The 8" dual diaphram booster is the common style the suppliers such as mpbrakes sell.I was going to use an S10 booster which my metric m.c. fit, but pedal hookup was an issue, so got the dual which has a threaded push bolt allowing for easier extension to reach my pedal.I didn't relize that the m.c. wouldn't work. I got a late 60's style one today.They didn't have a "vette" one in stock, so took one that was for Chevelles, Impalas, and pickups.It has the large res. for the front discs on the front end, instead of the booster end? How come? This is a very common m.c. that interchanges between a lot of different G.M. cars, but have not seen much aboutthis on this site?
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Old 02-03-2005, 04:49 AM
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My parts stores didn't have the Vette MC in stock either, but I got on the Advance Auto parts web site and ordered one myself. In two days I had a brand new Raybestos 69 big block Vette 4 wheel manual disc brake MC.

Vince
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Old 02-04-2005, 10:37 AM
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Front Resivoir for Front Brakes

GM liked to do that on most of their pre 80s models. Who can say why?

The '77 Chevelle/El camino with a manual brake 15/16" master had the front res for the rear brakes, like most Ford and Chrysler of the time, but most of the others were opposite.... some of the Chrysler trucks I think were set up like the GM.

The 1st and 2nd generation S10 masters were 15/16" bore, with a large step bore in the back. The early S10 step bore was 1.25" for manual brakes and 36mm for power brakes, both having a 15/16" bore for normal braking function. The large step bore is used at pressures below ~100psi to increase fluid volume to the 'low-drag' calipers. The 15/16" side was used for the high pressure needed to run those eensy-beensy calipers.

Some people take the manual brake S10 master and machine the butt down to fit in the early boosters.

The C3 Corvette masters came in 1" and 1.125" up to 1976, after that they were all power brake 1.125". The early ones had deep pushrod holes. Either one will run the metric S10 calipers providing sufficient boost. They were also front-resivoir for front-brakes.

The disc/drum truck master you got should also be a 1.125" if it is for power brakes.

Last edited by yesgo; 02-04-2005 at 10:49 AM.
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Old 02-04-2005, 04:21 PM
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Yesgo, thanks for all the good info. I'll file that away for future reference.
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Old 05-25-2006, 01:13 AM
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Hydroboost Vs 8' Dual Dia

Those Off Shore "generic" Street Rod Boosters Actually Measure 7" Working Area On The Rear Dia, And 4.6" On The Front Dia. Actual Dia Area Is Less Than The 11" Stock Chevelle Boosters. They Are O.k. If You Have Vacuum Over 18" Available. People Use Them Because They Are Small. Size Matters In Vacuum Dia. Sq In. Area Mutiplied By The Inches Of Vacuum. With Vacuum They Produce About 850psi. Even Better Is The Hydroboost. It Is The Same Width As A Master Cyl, Flat On The Bottom, Accomodates Masters From 7/8" To 1 5'8" And Delivers 2000psi To The Calipers With No Vacuum Involved. They Run Off The Power Steering Pump Pressure.stainless Lines Are Available To Easily Connect. They Are Easy To Mount, As They Have Interchangable Mounting Plates Retained By A 2" Nut, And Come With Custom Or Threaded Rods. The Are Photos On The Site Powerbrakesonlinedotcom
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