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Old 06-16-2005, 07:37 AM
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Brake experts needed!

I am having a difficult time fitting the master cylinder/booster assembly into my limited space. The unit is way to long for my application. I would like to eliminate the booster but, I have four wheel disc brakes and I know the pressure won't be high enough with my current master cylinder without standing on the pedal.

The front calipers are gm units that came with the granada rotor kit I purchased and the rear are from a late model firebird. I went to a salvage yard yesterday and measured some hydro/assist units and they weren't any shorter than what I already have.

Is there any way of eliminating the booster and having acceptable brakes without considerable pedal effort? Thanks.

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Old 06-16-2005, 08:16 AM
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Quote:
Originally Posted by americanLT1
I am having a difficult time fitting the master cylinder/booster assembly into my limited space.
Is there any way of eliminating the booster and having acceptable brakes without considerable pedal effort? Thanks.

Some of the early disc brake Corvettes came with 4 wheel disc brakes and no booster.

1966 to 1968 range.....if my memory serves me correctly....

DEUCE.....
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Old 06-16-2005, 10:20 AM
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Deuce is correct. The 67 Corvette 427 435hp (3 2bbl carbs) four wheel manual disk's. Raybestos makes a brand new MC for this application (do not go rebuilt). Advance Auto has it, it's Raybestos part #MC36367. Of course there are other factors that come into play when you talk about pedal pressure, like the ratio. Usually a manual application is around 6 to 1. With the Raybestos MC mentioned your brake pedal pressure should not be excessive. My 34 chassis came with a booster and MC installed which left absolutely zero room to route exhaust through the tubular "X" member. My chassis also has 4 wheel Wilwood disk brakes. I did away with the booster and installed the Raybestos MC and my pedal pressure is not excessive. Remember a booster does not improve your brakes, just reduces pedal pressure.

Vince

Last edited by 302/Z28; 06-16-2005 at 10:29 AM.
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Old 06-16-2005, 02:19 PM
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302/Z28 is correct.
If you are using calipers sized similar to that Corvette, AND a Corvette pedal ratio, the Corvette master will work fine.
http://www.outlawdiscbrakes.com/faq.html
Measure your pedal ratio.
Determine your front caliper size in sq".
Determine rear caliper size in sq".

There is math available to get it right the 1st time. It is not all on that page.

I have a feeling you are using smaller calipers and a lower pedal ratio than the 'vette did. If this is the case, the pedal might be very hard with that master.

The Corvette was available with manual 4wl disc up to 1975 I think.
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Old 06-16-2005, 03:17 PM
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Thanks for the info guys. If I go without a booster I think I'll mount the master cylinder on the frame. I'll probably fabricate most the parts myself so I may be able to go with a different ratio.

I'll have to see if I can get the bore sizes for my calipers so I can figure sq". I talked to a guy at wilwood today and he recommended a master with a 1" bore and a pedal ratio of about 7 to 1.
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Old 06-16-2005, 06:59 PM
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Quote:
Originally Posted by americanLT1
I talked to a guy at wilwood today and he recommended a master with a 1" bore and a pedal ratio of about 7 to 1.
I talked to them also and they are the ones that recommended the Raybestos Corvette master cylinder to me.

Vince
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