318i front rotors to 325e

[MikeM10]

So i plan on switching my front 318i rotors to the vented 325e rotors in the front. Its my understanding that i pretty much just need the calipers rotors and pads to make it work. I also heard that the master cylinder in the 318i has a smaller bore than the 325e's. so my question is if i justs keep my 318i master cylinder will it affect my braking? any help is appreciated.

[TG Goose]

i'm running 1990 325i brakes on my 1984 318i. You need the rotors, calipers and caliper brackets. Pads are the same.

[irish44j]

m/c works fine. I'm running full 325i brakes (including the rear discs) with no issues on my early 318i.

[Jaxx_]

m/c works fine. I'm running full 325i brakes (including the rear discs) with no issues on my early 318i.

it will work, but apparently it is not properly portioned. that's all. I'm not really sure what the actual distribution is.

[TobyB]

Just make sure you have the 20mm master. According to realoem, you should.
That also went onto earlier 325's...

Measure the bore on the calipers. I'd be a bit surprised if they aren't both 48mm...

t

[E30RedtopSR]

318 master works, yes, barely. When I converted my 84 318i to rear disc and 325 brakes it was pathetic. 318 uses a stepped 19mm/??mm master for the rear drum. I went to a 23 mm master and what a difference.