Sam, I did a quick calculation and you lose about 20% of the braking clamp
force with the larger master cylinder of the V-Max on the XJR calipers. This
means you would have to squeeze harder on the lever to develop the
equivalent braking. This is assuming same rotor and brake pads.
Interestingly the XJR and the V-Max come out a wash with there respective
master cylinders in this calculation. I was wondering though, are they
working on the same diameter rotors? Brake torque is product of the applied
braking force (clamp force times coefficient of friction) and the effective
radius of the rotor (approximately the center of the braking surface).
Bigger the lever arm, in this case the rotor diameter, the greater the brake
torque for a given application of force at the caliper. In addition to the
twin piston calipers in the later model V-Maxes the rotor diameter also
increased.
To answer to your second question, yes BUT as discussed above the braking
won't be the same unless the rotors are the same diameter. The smaller
diameter master cylinder would end up with efforts similar to the stock set
up but you will have longer travels for equivalent fluid displacement
requirements of the calipers.
What effect fluid displacement? Lots of things, applied pressure, seal
roll back, squareness of piston to rotor, lining flatness, lining material
compressibility, brake wear (particularly true after hard usage with many
high pressure stop). Some brakes develop taper wear which adds more spring
to the system and more travel. Extreme usage such as racing can result in
brake pads and rotors warping like potato chips.
I hope all my long winded discussion is helpful,
Ronald Fisch V.M.O.A. 78
86 mostly stock, [EMAIL PROTECTED]
-<SNIP>
According to the XJR workshop manual the master cylinder is 14mm in
diameter,
caliper ID is listed as 30.2 and 27mm.(I assume the same as the R1)
The V-Max lists the master as having a 15.87mm bore and caliper diameters of
33.96 and 30.33mm.
So tell me brake experts, what is the net effect hydraulically of using the
R1
caliper with the bigger bore master of the V-Max?
Secondly, if I could adapt the XJR master to the Max would I be on the right
track?
Sam Blumenstein #795
Thomas Powell wrote:
> Eric, what pads is your brother using?
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