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25mm mastercylinder conversion

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    25mm mastercylinder conversion

    Recently converted to a 25mm mastercylinder on my '89 325i. I am basically posting this so someone in the future who performs a search might find the info I needed to find, to do it. I used an ATE mastercylinder from a 750/735i/il through 2/88 . P/N: 34311156643.
    I mounted it to my old Girling booster and it fit fine. I assume it will fit an ATE one just as well. As it turns out the M/C was $57 cheaper than the stock replacement. I spent more time bench bleeding the cylinder and bleeding the brakes on the car, as well as adjust pedal free-play than I spent actuall installing it. My initial impressions are good. Defninitely not too much for the car. The only down-side is that I now realize how piss-poor my pads and rotors actually are. It should also be noted that I converted to stainless steel softlines at the same time.

    #2
    Whats the benefit of this?
    More brake pressure?

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      #3
      The benefit is better feel. More fluid moved (ie more pressure) per distance of pedal movement. Supposed to be better for threshold braking. However, it is not often that I use threshold braking on the street.

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        #4
        what size is the stock mc?

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          #5
          Tenured Automotive Service Professional - Avid BMW Enthusiast

          Vapor Honing & E30 ABS Pump Refurbishment Service
          https://mtechniqueabs.com/

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            #6
            Mine was stamped 23 and 21mm.

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              #7
              I did this and a pair of powerdisks in front about 5 months ago. I like it very much. Better feel, less fade. There is a significant increase in brake dust though due to the powerdisks.

              [IMG]https://cimg4.ibsrv.net/gimg/my350z.com-vbulletin/550x225/80-parkerbsig_5096690e71d912ec1addc4a84e99c374685fc03 8.jpg[/IMG

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