What brake pedal bracketry is everyone using to connect into the mastercylinder?
The setup for the sierra doesn't fit. It looks like you need some sort of U bracket and clevis pin arrangement to fit to the pedals supplied by MK.
Bob has suggested I take a look at Merlin Motor Sport, any other suggestions?

I used a brake actuating rod and clevis pin from Merlin on my Indy with MK pedals. I had to cut the end off the rod and dome the shaft to suit the Sierra piston. From memory, I think Merlin said it was for a Girling master cylinder. It also needs an M8 fine nut, clevis pin and R clip.

If your mounting the cylinder direct to the bulk head the you should consider stiffening the cylinder mount. I did mine by fitting 25mmx3mm ally angle behind the cylinder, from bottom to near top of bulkhead, others have fitted plates but unless you get it to come a long way up it will be more work, more weight or less stiff.

Hope this helps,

Colin

the u bracket from the back of a brake
pedal as fitted to mk3 mk4 vauxhall
cavalier take the thin nut as well
then get a long shank bolt cut of the
head square that what i did and it works