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Master Cylinder Size


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I've fitted Astra rear calipers with single 34mm piston and Wilwood Midilite 4 pots with each piston having a diameter of 31.8mm to my Manta.  If I keep the original servo what size master cylinder should I fit? 



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you can still get a new Monza master cylinder off German ebay for around £120 that are 23mm diameter compared to manta 20mm should help.

golf 16v gti master cylinder and servo with separate pipes to each caliper for optimum performance.

bias pedal box with remote servo.

the choice is yours :wacko:

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I had a bias pedal box on my old Manta with .625 front and .75 rear. 

I can't find a suitable bias pedal box with internal cylinders at the moment which is why I'm looking at different master cylinders for the standard servo. 

Golf Mk2 GTI and Polo GT servos are going for silly money these days.


I'm looking to have a decent feel with not too much travel, so it looks like the Monza one should be OK with a bias valve in the rear brake line.

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  • 2 weeks later...

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