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Question on dual master brake setups

Old 02-17-08, 06:55 PM
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Question on dual master brake setups

Hey guys, when you are testing for brake fluid leaks, what is the highest PSI you test for leaks?

I haven't got the system fully bled yet, and I spotted two leaks at 550 psi in the front which I have to tighten even more. It won't leak below the 550 mark. The rear never leaked at it's highest point of 400 psi.

I know I won't have the car running those levels however I want to have a leak free system are there any guide lines.

if I remember correctly it's a 3/4 and 7/8 master cylinders....

Thanks for any help!
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Old 02-17-08, 10:57 PM
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Or would anyone know what the max output pressure of these masters can pump out so I have an idea of how far to go....

They are tilton 3/4 and 7/8

Thanks
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Old 02-18-08, 09:38 AM
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Well if you work backwards through the system you can figure out how much YOU can put through them.

A really hard pedal can be around 120 pounds of pressure at the pedal a soft one can be down around 80. Multiply that times the leverage of the pedal itself, probably around 6:1 and you get 480 to 720 lbs at the back of the master in hard braking. Your 3/4" master has .44 sq inches so you will end up with 1090 to 1635 PSI in the lines.
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Old 02-18-08, 04:38 PM
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Have you seen damian's thread about this with his setup?

Search this forum and the 3rd gen for his thread. It was very detailed.
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Old 02-18-08, 09:55 PM
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Thanks alot! Both jgrewe, and gracer7-rx7
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Old 02-18-08, 10:15 PM
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At first I thought your sig was an FD. If that is a first gen RX7, you may also want to search over at improvedtouring.com

Some ITA and IT7 cars that might have gone this route. Also maybe SCCA Production (E Prod) class cars with custom brake setups.
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Old 02-19-08, 10:48 AM
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Originally Posted by gracer7-rx7 View Post
At first I thought your sig was an FD. If that is a first gen RX7, you may also want to search over at improvedtouring.com

Some ITA and IT7 cars that might have gone this route. Also maybe SCCA Production (E Prod) class cars with custom brake setups.
Will do, thanks again. I also checked out the thread on daimen's setup.... very nice.
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Old 02-19-08, 04:26 PM
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What type of plumbing are you using? If you have AN plumbing, and you have a leak that is being difficult, then put a copper cone shaped seal washer in the leaky joint.

Brake pressures can go over 2000 psi.
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