master cylinder

Discussion in 'PSI Superchargers Tech Questions' started by spencer motorsports, Jul 17, 2006.

  1. spencer motorsports

    spencer motorsports New Member

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    I have a dual master cylinder made by cnc that i got out of the chassis shop. IT has a port that is 3/4 and one that is7/8 . WHAT one goes to the front and what ones goes to the rear? THE car is 125 funny car chassis with a hand brake.
     
    #1
    spencer motorsports, Jul 17, 2006
  2. Mike Canter

    Mike Canter Top Dragster
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    On a race car with big tires on the back and small tires on the front you hook the large outlet to the rear and the small to the front. If I remember correctly that large one is towards the pedal end of the master cylinder. Is that the way it is on yours?

    Just as a note: For a street car wit standard tires on the front you put the larger line to the front brakes so the front does 80% of the braking.
     
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    Mike Canter, Jul 17, 2006
  3. spencer motorsports

    spencer motorsports New Member

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    NO my ports are side by side.I thought that was the way it went but i like to get opinions first.
     
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    spencer motorsports, Jul 17, 2006
  4. Bob Meyer

    Bob Meyer Comp Eliminator

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    CNC side by side m.c.

    I have used that unit many times, works great, but it helps a ton to use the CNC (only) 2 lb. RPV in the 7/8" side screwed right in to the master cyl. (of course that's if the cyl. is lower than the calipers)
     
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    Bob Meyer, Jul 17, 2006
  5. nitrohawk

    nitrohawk New Member

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    Master Cyl.

    The smaller diameter brake cyl will apply more braking pressure than the large one. However the large one will apply prssure first if they both have the same travel and caliper area. aThe final pressure applied at the caliper though is affected by the caliper piston area. If you use the large one on the rear it will prob. have close to the same braking pressure as the small one on the front because the rear is usually a dual caliper and the front a single. The smaller the brake cyl. bore the more pressure you can apply until you run out of travel with the brake lever or pedal. Bob gave you some good advice about using the residule valve.
     
    #5
    nitrohawk, Jul 18, 2006
  6. aj481x

    aj481x Member

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    This is a really good point that many people are not aware of. We use RPV (residual pressure valves) on both ends. Absolutely ends "pumping up" the brakes.
     
    #6
    aj481x, Jul 18, 2006

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