Master Cylinders
Steelman - 31/7/09 at 08:23 PM
Can any explain why you use the smaller 0.625" master cylinder to feed the front brakes and the 0.75" master cylinder to feed the rear
brakes. I would have thought it was the opposite way round as there is more fluid in the 0.75" master cylinder
tomgregory2000 - 31/7/09 at 08:47 PM
the smaller the m/c piston the more pressure you can apply but more travel is needed but less pressure is needed on the pedal
i hope this makes sense, ive had a few ciders and am typing with one eye
[Edited on 31/7/09 by tomgregory2000]
britishtrident - 31/7/09 at 09:06 PM
quote:
Originally posted by Steelman
Can any explain why you use the smaller 0.625" master cylinder to feed the front brakes and the 0.75" master cylinder to feed the rear
brakes. I would have thought it was the opposite way round as there is more fluid in the 0.75" master cylinder
Normal to use 0.625 or 0.7 for both circuits unless you have over sized brakes on one circuit, in which case you change one master cylinder to give
one step up or down in bore size.
ie going up one size step in master cylinder bore reduces
the braking. on that circuit.
Ideally you want the balance bar pivot bearing to be more or less central if you end up more than say 4 or 5 turns to one side then it is worth
thinking about changing one of the cylinder sizes.
Normally a 7 style car with car engine will do about 66% of its braking via the front wheels about 33% from the rear, using Sierra calipers this
would normally work out OK with equal sized cylinders.
Using 0.625 on the front and a 0.75" on the rear will result in fronts lock way too early.