Ignoring the fluid change..... What is the combined area of the pistons compared to the previous single ones? I may know an alternative, but it depends what the requirements are. It could be that a larger bore master cylinder is needed, but some dimensions will be needed to calculate.
Martin
----- Original Message ----- From: "'Bob Craig' via Quantum Owners Group" <quantumowners@googlegroups.com>
To: "Quantum Owners Group" <quantumowners@googlegroups.com>
Sent: Sunday, March 24, 2019 5:39 PM
Subject: [Quantum Owners] Brake master cylinder conversions


After upgrading my already upgraded 2+2 brakes from Cosworth single piston calipers and huge discs to a much lighter Hispec billet 4 pot system, I can't get a decent brake pedal and have next to no braking force. I purged all the old brake fluid and refilled with dot5.1, pressure bled everything. I'm thinking that my master cylinder may be faulty and just looking at options. I know the later type cylinder is a bit like rocking horse poo these days and if going to the extent of changing, I'd rather have a more performance focused set up. Has anyone fitted the Burton Power bias assembly. It does away with the standard servo and master cylinder.

https://www.burtonpower.com/adjustable-bias-brake-assy-ford-fiesta-mk1-mk2-mk3-brk061.html

Bob

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