hr axles

[tdh]

hi guys i am new to rebuilding my beloved FC i have already put in the HR front discs for my warmed up 179 and was told i had to put in rear HR axle and being in QLD IS THIS TRUE  and where can i get  a copy of the specificatons from.

happy new year

pete

[DN2168]

Hi Pete,
 A Quote from Dr terry;

"Hi Guys

Just to clarify that, FE to FB have a square bolt patterned rear axle bearing retainer plate & EJ to HR have the pattern where the two top bolts are further apart  than the lower two.

When converting to front disc brakes it's alway better to change the rear end to the EJ to HR type & then you have the later duo-servo type brakes & can fit the 9/16" wheels cylinders & matching shoes.

There are minor differences between the EJ/EH rear end & the HD/HR item. The main ones are in the leaf spring mounting & the use of self-adjusters on HD/HR.

Regards.

Dr Terry."

Hope this helps.

Dean.

[mcl1959]

Pete, what you have been told is right in a round about way, what you in fact need is the correct sized rear wheel cylinder to suit the discs at the front (for front to rear brake balance). Now, there is no such cylinder to suit an FC rear end, so the easiest solution is to bolt in a HR (or equivalent) rear end which can then be fitted with the correct cylinders.


Ken

[tdh]

thanks guys


have a great new year

pete

[ehsv6]

Has anyone tried having the rear cylinders sleeved to the desired size. Imagine this would be easier than changing the whole rear end.

[mcl1959]

Yes it is possible, but I've never heard of anyone doing it. The rear brakes shoe area is larger on a HR so the size needs to be recalculated to suit the FC linings. Also on the same note, HR brakes are better because of their greater area and floating adjuster at the bottom of the linings.

Ken

[FC427]

You could always just fit a proportioning valve in the rear line to get correct brake bias  ........FC427.......