I'm planning to upgrade most of my braking system on my FRST in one go.
I want to remove the ABS and fit a non ABS mk5 master cylinder and servo and fit ST150 brake calipers and discs.
I've been researching this as much as I can but it seems the info is scattered all over the place with varying info.
So I'm going to tell you what I plan to do and what I'm theorising, so any pointers you can give would be superb.
Changing the actual brake calipers and discs I'm cool with.
ABS removal:- remove mechanical parts from the gearbox/drive shafts. As I am doing the Mk5 servo/master cylinder as well remove the original servo and master cylinder.. now this is where I want to make sure I am getting the plumbing right..
Having never had ABS on a Fiesta before I can see the differences being apart from all the mechanical bits, the two big heavy rear brake pressure reducing valves have been replaced for a couple of T-pieces on the left hand inner wing and I'm assuming this lot of crap on/above the rear beam pictured below is the load laden pressure reducing valve set up it has instead (nicked the pic not mine)
As I'm using a non ABS mk5 master cylinder it has four outputs unlike the two outputs I have already, so I can't use the T-pieces on the inner wing.
My theory was to plumb the front brakes as per normal using new pipes from the master cylinder to the front brakes. For the rears I was going to use the two small reducing valves that came with the Mk5 Master cylinder I have pictured here (in another nicked picture)
then remove the rear laden reducing valves and bypass them direct to the rear drums.
Do you think this would be ok? Also when plumbing these in do I have to take into consideration which output on the master cylinder goes to which brake as I seem to remember something about Fiesta's having the crossed circuit braking setup or something?
As for fitting the mk5 servo, I understand I remove the old servo from its brackets and attach the mk5 one to the old brackets by elongating the bolt holes and I will need to cut and shut the connecting rod by 20mm and extend the vacum hose. Is this all that’s needed to be done? Is definitely 20mm exactly that needs to be removed from the rod?