no..its the same one as what came on base model golfs and jettas. 20mm, maybe even 19mm piston.the master cylinders that had 2 ports, instead of 4 ports were the easiest to get upgrades for.. my 85 GTI had the 2 port MC, and i upgraded it to a mk3 21mm MC.. but my 86 Golf, it has a 4 port MC, with separate prop valves screwed into it..the 4 port unit w/ prop valves WILL WORK with disk brakes tho. i have that particular setup. i favor the 2 port MC's better tho. less brake line clutter up around the MC.
Quote from: somolovitch3 on October 09, 2011, 06:39:08 pmJumping in a bit late...............................'87 Rocco with the "V" looking MC w/4 ports and the proportioning valves screwed into it? Is this a 22mm bore?no..its the same one as what came on base model golfs and jettas. 20mm, maybe even 19mm piston.the master cylinders that had 2 ports, instead of 4 ports were the easiest to get upgrades for.. my 85 GTI had the 2 port MC, and i upgraded it to a mk3 21mm MC.. but my 86 Golf, it has a 4 port MC, with separate prop valves screwed into it..the 4 port unit w/ prop valves WILL WORK with disk brakes tho. i have that particular setup. i favor the 2 port MC's better tho. less brake line clutter up around the MC.
Jumping in a bit late...............................'87 Rocco with the "V" looking MC w/4 ports and the proportioning valves screwed into it? Is this a 22mm bore?
Quote from: R.O.R-2.0 on October 09, 2011, 06:57:52 pmQuote from: somolovitch3 on October 09, 2011, 06:39:08 pmJumping in a bit late...............................'87 Rocco with the "V" looking MC w/4 ports and the proportioning valves screwed into it? Is this a 22mm bore?no..its the same one as what came on base model golfs and jettas. 20mm, maybe even 19mm piston.the master cylinders that had 2 ports, instead of 4 ports were the easiest to get upgrades for.. my 85 GTI had the 2 port MC, and i upgraded it to a mk3 21mm MC.. but my 86 Golf, it has a 4 port MC, with separate prop valves screwed into it..the 4 port unit w/ prop valves WILL WORK with disk brakes tho. i have that particular setup. i favor the 2 port MC's better tho. less brake line clutter up around the MC.So what you're saying, is that you can just take the rear axle out of a disc brake GTI mk2, throw it in a drum brake car, disregard that weird load-sensing prop. valve thing and just hook up the existing lines and use the stock master cylinder with the 2 "shotgun shell" proportioning valves in place? Because that's exactly what I intend to do... I thought the proportioning valves would give me trouble though. Should I just find a mk3 4 port, non-abs master cylinder and use that, with the same proportioning valves?