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John Rogers's Avatar
 
Join Date: Dec 1969
Location: chula vista ca usa
Posts: 4,861
23mm master cylinder

Well today I finally got the brakes on the 914 race car finished. I bought and installed a 23mm Mercedes m/c and now have the BMW 320i calipers front and rear and the pedal is like a rock with only 1/2 inch of travel to get pressure up full. As Mike and others have noted the bigger calipers do require more than a 19mm m/c or you even though you get a solid pedal but lots of travel, not what I wanted. I had to repace the auxilary support that the steering rack bolts to with a 911 alloy piece, since the stock tube member gets in the way of the m/c and I had to also run tubing to the fittings on the top of the m/c. I did not use the pressure switch so Rennsport installs a ss plug in that hole. Finally, I had to extend the pedal rod adjuster screw with a barrel nut and extra piece of bolt which allowed the correct clearance. This would be the answer for anyone that is also installing M calipers or Turbo brakes on their race car. I am writing a full article with pictures that will also cover the installation of the manual parking brake calipers too and should have it ready for PP's tech area this week.
Old 06-10-2000, 11:02 PM
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neilca's Avatar
 
Join Date: Oct 1999
Location: Marietta, GA
Posts: 803
John,
Thanks for keeping us up to date. What Merc is the cylinder from? Did you use an adjustable brake bias device?
Thanks again,
neil
Old 06-12-2000, 04:31 AM
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John Rogers's Avatar
 
Join Date: Dec 1969
Location: chula vista ca usa
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I have no idea what model it came from? I ordered it from Rennsport in Oregon and their web site is: http://www.rennsportsystems.com.
Steve was a great help and he has a neat little fitting so the steering rack will miss the fluid inlet lines. I haven't put in a manual bias valve yet since I want to try a few autocrosses/time trials to see how the car works without one.
Old 06-12-2000, 07:24 AM
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