Why do you need rear discs ? The 300 series is quite close to being over braked on the rear anyway.
With a "brand new" system front and rear (until front pads bed in) it is ridiculously easy to suffer from
rear lock up induced oversteer on a 340 let alone a 360 with larger rears anyway. Even for "spirited"
use you should only need to consider a better grade of front pad to guard against fade.
Mac.
88 5door Redline 1.7 52k - 19 XC60 Momentum Pro D4 AWD 17k
1950 pair of legs that don't work very well.
Its more or less my hubs are buggerdand my slaves and shoes. and i like my cars to stand out. to get the rear setup fixed I'm loking about £50 and i though discs would kill two birds with one stone
Wheel cylinders are cheap, and all other parts easily available. There is a good thread on bearing replacement.
Some modern cars I've worked on have spring loaded handbrake drive pistons (from cables) built into the calliper, so that might save fitting dual drum/disk jobs (like on the 940). But these cars are FWD so you need something from a RWD car like a BMW or a later 4x4.
I agree with Mac, the standard items are fine. Its a huge engineering job to adapt something and I just don't think there is enough space.
Yes DIY with the right bits. I hammered mine out with a tube, but maybe possible to do in an oven it should fall out at about 200C, but grease will drain out and might be a fire/smoke/cancer hazard.