I'm still using the stock master cylinder for the 300CE. The car came stock with 4 piston calipers, just for the smaller 295mm rotors. The new calipers must be very close in displaced volume, if not the same as the stock calipers. They even use the same brake pad. I'll admit that it is a much better balanced setup than I expected the collection of parts would be.

FWIW I have stock rear brakes with just the braided lines. I used the vented rears on my turbo wagon and they warp way too easy. Holding the brakes and spinning up the rears probably doesnt help

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff