Thread: 10" or 11"... baby!

Originally Posted by LandyAndy

An extra inch in dia gives the brakes a larger operating circumference,with that and the twin pistons makes for a much better brake.If you can get the 3" wide drums for the front grab them,they are great.You need the matching 3" backing plates as they are different to 2 1/4"
Andrew

Do you (or anyone else) have a pic of what the 3" backing plate looks like?

These are the 11" drums I have at present, the second one down is the odd one out, from what everyone here has said that would be a drum for 3" pads then?

None of them are 3" drums.

3" drums have absolutely no chamfer - like this:

(this is a 101 drum though).

As an aside - it is a good idea to drill the drain holes out slightly larger. Stops them blocking up with brake dust and mud.

The screws that hold the drums on are completely unnecessary.

Do you have a pic of the backing plates for 3"? I have two different ones (different shape holes for the wheel cylinder)

I think they are two alternatives for the 2.25" brakes. The 3" ones will have a deeper relief pressed into them, as the wheel cylinder has still to be in the middle of the shoe sideways, so it has to be further from the flange where it mounts on the stub axle. Same as your picture of the drums shows two different versions of the 2.25" drums.

John

Thanks for all your wise words guys. I know have a set of 11" drums that are all the same +backing plates that are the same (2 front ones and 2 rear ones).

I also have the pedal unit with the servo +brake master/reservoir.

Just need to source wheel cylinders; I have not checked whether they are worth getting rebuild kits for yet... but chances are I'll need new ones I guess!

I setup my series 2 SWB with 4cyl 11" on the front and 10" on the rear with no booster, I could rest my big toe on the pedal to stop and they worked great.

G'day TeZZap

You could go all new Genuine wheel cylinders, or get your/ or second hand ones Stainless Steel Sleeved by a specialist brake coy. as I did years ago, it saves the wheel cylinders pitting out from moisture

the original wheel cylinders on mine were cast iron and not alloy.

cheers