wheel cylinder dimensions

[my8thholden]

are the wheel cylinder on FC the same size as FB ....are the rubber cups the same front and rear ?  ...

[Errol62]

Rear are lager diameter and 1/4” SAE flare seats, rather than 7/32”, from memory. I believe front are same just the rubber hoses will be different x 3, left, right, rear. Once again the flare seats.


Sent from my iPad using Tapatalk

[ardiesse]

Vern,

Nope.

FX-FC have 1-1/16" diameter rear wheel cylinders; FB-EK have 1" diameter rear wheel cylinders.  The change in SAE flare and brake pipe sizes is so you can't easily interchange the rear wheel cylinders.  Fronts remain unchanged at 1-3/16" diameter.

But then I came unstuck with replacement front brake hoses for my FC.  The brake place sold me the ones with the smaller (female) flare and I sheared off the brake pipe after overtightening it, attempting to stop a leak.  Went back to the brake place with the hoses and broken pipe.  They were most apologetic, made me a new brake pipe and some little flared copper washers, and all was good.

But you could, if you wanted, change the brake pipes and union on the rear axle over to (I think) 3/16" diameter brake pipe and fit FB/EK rear wheel cylinders to improve brake bias.

Rob