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Will An E46 M3 Brake Master Work For Me?


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Hi guys running volvos on the front and trying to sort out the MC. My car is RHD and has dual boosters. i cant afford an e9, e12 MC so looking at others


found these




looks ideal for fitment but cant find a bore spec however it is for a vastly larger car than the 02


*edit appears to be 22.20 mm



and thee 46 m3




i would of course chuck the booster.


specs are 25mm bore for front brakes and 20mm for rears.


would this make the car seriously biased to the front until i upgrade to rear disks?


*edit found that the e36 m3 cylinder is the same shape however is 25mm throughout but again are quite expensive








Edited by DaveBMX
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The Standard RHD master Cylinder is plenty for the setup you decribe  and the reality is if you were to go for a boosterless system you really want a smaller master cylinder, Ive beeing toying with something simular using a volvo 240 brake junction box and the volvo 15mm master to decrease the pedal effort if I go down that route.

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Start with your original.  It will work.


If you hate it, THEN it's time to try something different.


But I wouldn't recommend a stepped master unless you do the math for it...



"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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I have been running big brakes with the standard master cylinder and it was fine. The only time I found any issues with it was when I ran a few track days when I would run the usual 5-6 laps then I'd line up straight away for the next group (that way you'd get a few extra sessions in the day :) )  Even then with hot brakes it was only a little extra travel. Never a problem.




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