front discs - opinions on quick take up masters 79-87+

[Chuck78]

Eventually I'm doing a front xmember swap for to gain 5 lug discs and $10 ball joints (vs $120 and $60 lower and upper for a 62), and I got a 73-87 xmember and booster/master/prop valve from the same 89 suburban (73-91 burbs are samebody/chassis as 73-87 pu's).

I didn't want the quick take up MC because of the plastic reservoir and modern look that it'd add to m6 62 GMC. THen I started reading up on it, and realized that they are designed for less drag and better gas mileage... This made me think twice about them, although I still don't like the look (rather have cast than parts plastic).

How many people run them, and how many of you have good opinions of them, or good/bad experiences? My winter beater 89 burban has one, but I never gave it any thought. Got same year 1/2 ton burban xmember from a boneyard for hte disc swap.

What calipers do you guys have them mated to? If you know the piston size of the caliper, post it please. seems they are typically, for the JB5 setup, 1-1/8 rear drum master bore, and 1-37/64 front disc bore. I believe the same front calipers are used with a standard 1-1/8 non-step bore master, but not sure. Thanks!