[Healeys] Brakes -rear wheel cylinders
rchaskell at earthlink.net
Sun Mar 24 16:19:20 MDT 2019
The rear wheel brake cylinders are 1" diameter on the 100 and 100-6.
When the disc brakes were introduced on the 3000 MkI, the wheel
cylinder diameter changed to 3/4". So if one is fitting a 3000 disc
brake set up to an earlier car, should the rear cylinders be swapped out
If I'm doing the math correctly, the force on the brake shoes with the
smaller cylinders will be 56% of the force with the large cylinders, for
the same hydraulic pressure.
force = pressure * area
area = PI * (dia / 2)^2
1" cylinder -> area of 0.785 sq. in.
3/4" cylinder -> area of 0.442 sq. in.
0.442 / 0.785 -> 0.562 or 56%.
Austin Healey 3000 MkI registrar
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