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BradGTV
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MasterCylinder Sizing

Post by BradGTV »

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
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Giuliettaevo2
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Re: MasterCylinder Sizing

Post by Giuliettaevo2 »

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:
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BradGTV
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Re: MasterCylinder Sizing

Post by BradGTV »

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
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Zamani
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Re: MasterCylinder Sizing

Post by Zamani »

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...)
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BradGTV
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Re: MasterCylinder Sizing

Post by BradGTV »

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
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MD
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Re: MasterCylinder Sizing

Post by MD »

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.
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BradGTV
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Re: MasterCylinder Sizing

Post by BradGTV »

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
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MD
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Re: MasterCylinder Sizing

Post by MD »

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?
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BradGTV
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Re: MasterCylinder Sizing

Post by BradGTV »

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
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Re: MasterCylinder Sizing

Post by Giuliettaevo2 »

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:
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Re: MasterCylinder Sizing

Post by LacUS »

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?
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