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Old November 11th, 2009, 12:07 AM
PseudoZone PseudoZone is offline
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Default ricepaddycaddy : Master Cylinder Upgrade

Master Cylinder Upgrade
Post by ricepaddycaddy on Jun 18, 2006, 12:29pm

Hey guys, which master cylider is used in a M715 to upgrade its brake system? Thanks.
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Old November 11th, 2009, 12:07 AM
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Re: Master Cylinder Upgrade
Post by barrman on Jun 20, 2006, 9:44am

Do you want to stay stock or go to a dual line mc?
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Old November 11th, 2009, 12:08 AM
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Re: Master Cylinder Upgrade
Post by teking on Jun 20, 2006, 11:43am

i have a 70s dual Corvette MC on my truck.
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Old November 11th, 2009, 12:08 AM
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Re: Master Cylinder Upgrade
Post by bluesman2a on Jun 20, 2006, 2:21pm

69 corvette with all wheel discs.
You need to run two separate lines for front/rear.

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Old November 11th, 2009, 12:08 AM
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Re: Master Cylinder Upgrade
Post by teking on Jun 20, 2006, 2:24pm

Same one I have! How is your peddle travel before braking begins? Are you using the stock rod?
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Old November 11th, 2009, 12:08 AM
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Re: Master Cylinder Upgrade
Post by bluesman2a on Jun 20, 2006, 3:18pm

I'm using the stock rod and before all my upgrades the pedal was firm, but sat very high. I now have an FSJ automatic (wide) brake pedal, so we'll see how it changes. I've also upgraded to 4 wheel discs, so that will be a change also.
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Old November 11th, 2009, 12:08 AM
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Re: Master Cylinder Upgrade
Post by barrman on Jun 20, 2006, 3:21pm

1976 was the last year that Corvettes were available with non power assisted disc/disc brakes. The mc from that year and some years before it is a great upgrade to the M715. Both lines have the same piston diameter so equal pressure is sent out. You need to make a new line that goes near the block the brake light sender is currently mounted. Disconnect the rear brake line from that block. Plug the hole and connect your new line from the mc to the rear line. Bleed the brakes and drive.

Unless you lengthen the brake push rod about 3/4", you will have a low pedal before you even start to apply pressure to the brakes. Many have cut the stock rod, added metal and rewelded. I have done this swap and didn't lengthen my push rod because I plan to add Hydroboost in the future and don't want to figure it out twice.
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Old November 11th, 2009, 12:08 AM
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Re: Master Cylinder Upgrade
Post by robertcowan on Jun 20, 2006, 9:59pm

do you guys know any truck on the market or ever been on the market with a master cylinder the size of a vette m/c. i dont see the logic. put a truck m/c on a truck. cost is the same , probably cheaper.
bob
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Old November 11th, 2009, 12:08 AM
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Re: Master Cylinder Upgrade
Post by compexp on Jun 20, 2006, 10:42pm

I used a Cardone unit - I'll have to try and find the part number, but it was only $12 or so. Added a dual master cylinder adapter from NAPA and ran an extra line from the master to the rear brake line. Capped off the original rear feed from the proportioning valve.

This is a non-power cylinder but works well.
 

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