Lurch88
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| posted on 29/1/09 at 02:45 PM |
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Brake Master Cylinders ,Again ,Again
Whot Ho
I have bought a Mk1 Fiesta brake master cylinder to install on my MK.
Having removed the dust caps for the first time I find that it has three
Normal size (M10x 1mm) ports and one slightly larger port.
Does any one know how this cylinder was mounted on the Fiesta .
Which ports went to the front brakes and which to the back.
Also what went in the lager port? (Brake Light Switch?)
Ta
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Lurch88
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| posted on 29/1/09 at 02:50 PM |
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whoops
My master Cylinder appears to have gained a Lager Port!
Shame its only a Larger Port.
Oh well.
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GeoffT
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| posted on 29/1/09 at 03:24 PM |
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Pretty sure the larger port will be M12, uncle Henry seemed to have a habit of mixing port sizes on the m/c's. You'll have no trouble
finding M12 unions to fit these.
There seems to be no hard and fast rule as to which pair of brakes go to which ports, I did a fair bit of research on this and found examples of both
arrangements - I tried mine both ways, the brake bias seemed the same either way. I believe some m/c's are stepped bore though (i.e. different
bore between primary and secondary) obviously this would affect the bias.
Incidently I've now changed from a 22mm Sierra cylinder to a 17.5mm Fiesta jobbie and now have a much improved brake pedal, softer and a lot
more 'feel' to it.
Geoff.
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Lurch88
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| posted on 29/1/09 at 04:10 PM |
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When you say both ways, you mean front ports to back brakes or front ports to rear brakes work equally well,meaning a 50/50 split?
I only have three pipes one to the back two to the fronts and was a little concerned that if it was a "X" split life would get interesting
the first time I jumped on the brakes!
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GeoffT
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| posted on 29/1/09 at 04:38 PM |
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Yup, one axle to front ports, the other axle to rear ports, 50/50 not diagonal. Same as you I had three pipes and four ports, I blanked the spare port
with a 12mm bleed nipple.
I'm still not really sure what the Primary and Secondary notation actually means - if you look at the design of the cylinder, it doesn't
favour either circuit, failure of either will still leave the other circuit working, albeit with a longer pedal travel. Maybe somebody will
enlighten........
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Lurch88
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| posted on 29/1/09 at 04:43 PM |
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Thats fantastic, just what I was looking for.
Back to the Garage!
Ta
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