Hey one of mine is leaking I am about 99% sure I have Cooper AP 7.5" discs. Which rear cylinders should I be using. From what I remember when I did this last there are 3/4" 5/8" cylinders. Spoke to someone this morning at Mspares & he mentioned 1/16" cylinders.

Which ones guys?

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PrOuDlY aSkInG qUeStIoNs FoR uR aMuEsMeNt

For a disc brake front end you need 5/8" rear cylinders. 3/4" rear cylinders are for cars with drum brake front ends.

1/16" cylinders seem a bit small. I would think you may have misheard the measurement.

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"In two years time your car will be like a lady's clothes, out of date, my car will still be in fashion when I am dead" - Sir Alec speaking to Pininfarina

I have some new quality QH brand cylinders here that are 5/8. $15 each.
3271 4616 or 0432 841 247

There is some usefull information on the Minispares UK website.
Here is a brief cut and paste which may assist?
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As a guide to start with, working suggestions I have used with reasonable success can be generally channeled into a few groups -

*Discs with 4-pots and latest built-in servo and 7.5" discs with S-type servo, use GWC1131 -- 0.5625"(14.29mm) .

*8.4" discs with or without servo, use GWC1126 -- 0.500"(12.7mm).

*7.5" discs no servo use GWC1129 -- 0.6875"(17.46mm) .

it's a working start.

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1969 Cooper "S"
1967 Mini Deluxe
1973 Clubman Van (the fleet spare)
1978 ex 1275 LS ("Wizard" Eaton Supercharged)
2015 HSV GenF GTS(occasional drive & tow car)
2019 MINI F55 Cooper S

TK im in sydney & karkraft is just down the road but I'll let u know. Thanks

Then I'm after the smaller 5/8" ones allowing more pressure to the Cooper discs I have.

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