MasterCylinder Sizing

Post Reply
BradGTV
Gold
Gold
Posts: 133
Joined: Thu Sep 24, 2009 2:55 am
Location: South Australia

MasterCylinder Sizing

Post by BradGTV » Wed Dec 08, 2010 3:54 am

for my 79 GTV track car, im converting to a balance bar and individual master cylinders, i know a few members on here have converted to this same set up or other members will be able to give advise...
i plan volvo 4 pot calipers on the front, and alfa 75 2 pot calipers for the back.
just wondering what size bore mastercylinder's are recommended for my requirements?
cheers, Brad
79 GTV (sr20) 83 GTV (TS) 85 GTV, 76 GT, 84 GTV6, 91 164, 88 75 TS & 89 75 TS
User avatar
Giuliettaevo2
Verde
Verde
Posts: 776
Joined: Sun May 08, 2005 11:56 pm
Location: Netherlands

Re: MasterCylinder Sizing

Post by Giuliettaevo2 » Wed Dec 08, 2010 10:01 am

Quick tip; :D

105 series rear calipers are a direct fit solution for the rear brakes. You get essentially the same caliper, just without the handbrake-mechanism (and it's associated problems like adjusting). they are interchangeble. All the 75 racers over here use them. :wink:
Drive it like you stole it...
BradGTV
Gold
Gold
Posts: 133
Joined: Thu Sep 24, 2009 2:55 am
Location: South Australia

Re: MasterCylinder Sizing

Post by BradGTV » Wed Dec 08, 2010 11:40 am

thanks for the tip!
but only problem is im converting to outboard rear brakes so it dosent really apply to me :lol:
79 GTV (sr20) 83 GTV (TS) 85 GTV, 76 GT, 84 GTV6, 91 164, 88 75 TS & 89 75 TS
User avatar
Zamani
Site Admin
Site Admin
Posts: 1671
Joined: Sun Nov 28, 2004 8:20 pm
Location: Cameroon

Re: MasterCylinder Sizing

Post by Zamani » Thu Dec 09, 2010 11:41 am

Those Volvo calipers are damn heavy though, I went with the Brembos from the Porsche 944 Turbo, lightweight aluminum hats and 300mm x 28mm discs (well as far as I can remember anyway...)
Dr. Alban
BradGTV
Gold
Gold
Posts: 133
Joined: Thu Sep 24, 2009 2:55 am
Location: South Australia

Re: MasterCylinder Sizing

Post by BradGTV » Thu Dec 09, 2010 1:41 pm

yes they do weight quite a bit, but.. im not to concerned about that, for the price they cost and the breaking perfomance i get out of them is fantastic 8) and porsche brakes over here will cost a fortrune :roll: i have another caliper in mind that i could use, they are extremly light but are 2 psiton sliding calipers
79 GTV (sr20) 83 GTV (TS) 85 GTV, 76 GT, 84 GTV6, 91 164, 88 75 TS & 89 75 TS
User avatar
MD
Verde
Verde
Posts: 2364
Joined: Mon Nov 22, 2004 2:37 am
Location: Brisbane, Australia

Re: MasterCylinder Sizing

Post by MD » Fri Dec 10, 2010 2:39 am

If cost is an issue, stick with the Volvo opposing piston calipers instead of the slider type.
The Volvos are a proven thing amongst the racing mob.
Transaxle Alfas Haul More Arse
BradGTV
Gold
Gold
Posts: 133
Joined: Thu Sep 24, 2009 2:55 am
Location: South Australia

Re: MasterCylinder Sizing

Post by BradGTV » Fri Dec 10, 2010 3:33 pm

thanks guys,
i think i will stick with the volvo's,
although a guy here in adelaide is using vs commodore claipers on the front, and i know that a popular upgrade for vs commodore brakes are the ones from a VT which are the 2 piston sliding, but ive proven and tested the volvos so might aswell use them again :lol:

no one has an idea of what size mastercylinders would be required??
79 GTV (sr20) 83 GTV (TS) 85 GTV, 76 GT, 84 GTV6, 91 164, 88 75 TS & 89 75 TS
User avatar
MD
Verde
Verde
Posts: 2364
Joined: Mon Nov 22, 2004 2:37 am
Location: Brisbane, Australia

Re: MasterCylinder Sizing

Post by MD » Fri Dec 10, 2010 3:54 pm

Try a one inch to start with. Just get a cheap used one that is still working to experiment with. If it is good with minimal travel and not too hard pedal, get it rebuilt like new and reinstall.

...er, be sure you test somewhere safe, yes?
Transaxle Alfas Haul More Arse
BradGTV
Gold
Gold
Posts: 133
Joined: Thu Sep 24, 2009 2:55 am
Location: South Australia

Re: MasterCylinder Sizing

Post by BradGTV » Sat Dec 11, 2010 1:06 am

thanks again MD,
yes, testing is done on the highway :mrgreen:
79 GTV (sr20) 83 GTV (TS) 85 GTV, 76 GT, 84 GTV6, 91 164, 88 75 TS & 89 75 TS
User avatar
Giuliettaevo2
Verde
Verde
Posts: 776
Joined: Sun May 08, 2005 11:56 pm
Location: Netherlands

Re: MasterCylinder Sizing

Post by Giuliettaevo2 » Sat Dec 11, 2010 1:19 am

On my giulietta i had the Volvo 4 pots at front and original rears. I used a MC from a Fiat Ducato that was 1" (25.4mm) and fitted right in place of the original. 8) pressure regulator between front and rears will do the rest.

Pedaltravel and feel was excellent with this setup but remember i still had the booster-assistance. :wink:
Drive it like you stole it...
User avatar
LacUS
Silver
Silver
Posts: 17
Joined: Thu Jan 07, 2010 11:05 am
Location: Hungary
Contact:

Re: MasterCylinder Sizing

Post by LacUS » Sat May 28, 2011 11:59 am

Can anybody help sizing the master cylinders to a dual master cylinder setup? My front a calipers are from a 156 GTA, the rear ones are stock. I planned a 0.7" wilwood to the front and 0.65" to rear. What do you think?
LacUS
Image
Post Reply