Guest EPS Posted February 15, 2001 Share Posted February 15, 2001 I've seen the 79-81 master cylinder used on early models. Mine is 78. Is there an advantage since mine is already two resevoirs? Also the 2+2 brake vac is suppose to lessen brake effort by about 25%. Can this be a "bolt up?" Dealers and some Z guys don't have a clue. Any suggestions always appreciated. THX! Quote Link to comment Share on other sites More sharing options...
DavyZ Posted February 15, 2001 Share Posted February 15, 2001 This is supposed to be a bolt-on operation. There was a thread a while back and someone had done this with no problems whatsoever. Ah, here is what the JTR manual has to say: "The power brake booster from a 280Z 2+2 is larger than the 2 passenger Z car and offers about 30% more hydraulic pressure for a given pedal pressure. This unit will not fit in the earlier 240Z cars because the clutch master cylinder is positioned too close to the power brake booster. If you are using an automatic transmission, there is no clearance problem." So, if you can even do this depends on which tranny you use. Hope this helps David Quote Link to comment Share on other sites More sharing options...
Guest scca Posted February 15, 2001 Share Posted February 15, 2001 if you still have stock brakes adding the larger booster/master is not much improvement IMO... the master from all Z-ZX's will bolt in.. XZ are 15/16" whereas earlier are smaller.. ------------------ Mike mike@fonebooth.com http://www.fonebooth.com/brakes.html raceparts and brake upgrades. Quote Link to comment Share on other sites More sharing options...
blueovalz Posted February 15, 2001 Share Posted February 15, 2001 SCCA kind'a hit it where I was thinking. Unless you have larger pistons on the calipers (or greater total piston area for multi-piston calipers) you will reduce the amount of leverage (master cylinder piston area:caliper piston area being increased)you have for brake pressure. Sure, the pedal will feel firmer, put that is because you will have the reduced leverage ( increased the resistance). The reverse is true for those that put larger piston calipers on, without increasing the master cylinder piston area. The leverage increases and they will get excellent pressure to the calipers, but the pedal will feel a bit mushy. The key is to balance out the system. The OEM system is pretty good, so if you can keep the ratio of master:caliper close to OEM, you will keep the OEM "feel". And as my wife would say..blaa blaa blaa blaa blaa. Terry Quote Link to comment Share on other sites More sharing options...
BLKMGK Posted February 16, 2001 Share Posted February 16, 2001 Any of th eaftermarket masters worth looking at? Any that bolt up? I MAY be looking at Outlaws all the way around and if so I'm pretty sure my piston volume will have gone up a good bit... Quote Link to comment Share on other sites More sharing options...
Guest scca Posted February 16, 2001 Share Posted February 16, 2001 most aftermarket master are the same bolt pattern but not a dual reservoir. so not safe unless youuse 2 separate masters and a balance bar-- not needed for street use.. one of my other back projects was to use a z32 or 240sx master that bolts on reversed pattern and figure out the spacing to use it on a earlyZ .. the 300 are 1&1/16" so larger than the 280zx... a 15/16 is more than sufficent.. for the street but larger always looks better... Mike Quote Link to comment Share on other sites More sharing options...
randy 77zt Posted February 16, 2001 Share Posted February 16, 2001 i run 4 wheel disc with oem 7/8 master -no problem.the 15/16 z master would reduce leverage but speed up reaction time.a buddies 72 z race car has willwood 4 piston front/2 piston rear set up with zx master and it works good.try the oem master first. Quote Link to comment Share on other sites More sharing options...
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