Richie's Mk1 Restoration

Lynn Eades · #1 03-07-14, 00:32

If you take the drum to a brake place they can have it machined and fit new oversize linings to the shoes which they can then radius grind to fit the new drum dia.

Michael R. · #2 03-07-14, 02:19

Why was one shoe worn?
With the expander assembly free to float, the shoes should have self centered.

RichardT10829 · #3 03-07-14, 09:09

One adjuster had stuck so one shoe was contacting more than the other

RichardT10829 · #4 03-07-14, 14:47

Does anyone have a datum ref regarding the ID of the drum when new ? And the thickness of the shoes when new ?

rob love · #5 03-07-14, 15:34

Brake lining dimensions are given at the back of the Brake section in UC-F1 as 3/8 thick, 2-3/4 wide, 12-1/4 long.

I have had sets bonded before. If you have your drum turned by a known diameter, you can have an equal thickness of shim installed under the lining to get the proper arc, but in that case you will also have to rivet as opposed to bonding the linings to the shoe.

Personally, I have always turned the drums clean, had the shoes relined, then had the shoes ground so they fit into the arc of the drum. They will still need to set themselves in to some degree, so don't expect perfect brakes right off, and expect to have to re-adjust them a time or two as they fully set in.

The braking/turning power of a clean set of drums and shoes will not be experienced with grooved drums. Surface area is the key.

Lynn Eades · #6 03-07-14, 15:35

Rich. theres no spec in my book so try this. I think the original lining thickness was 3/8" So take the curve of a shoe with no lining. Plot a circle from it, adding 2 x the lining thickness, which should give you a nominal size Something like 15" From this and the unworn lip inside your drum, you should be able to make an educated guess at the original drum dia, and how much might already have been turned from your drums. Probably Richard F. is on the nail when he said it might be original dia. plus wear.

RichardT10829 · #7 03-07-14, 15:44

Cheers guys, just at work trying to organise stuff so don't have my book to hand

Lynn Eades · #8 04-07-14, 00:29

Rich. be aware that when I said 15'', I should have said " a std nominal size" (what ever it is) I don't have one to measure, here.

Richard Farrant · #9 04-07-14, 00:48

Quote:

Originally Posted by Lynn Eades

Rich. be aware that when I said 15'', I should have said " a std nominal size" (what ever it is) I don't have one to measure, here.

The drum inside diameter is 14 inches. (taken from Canadian manual). Cannot recollect what was removed to clear the wear on the Scout, but no doubt got it here on my notes somewhere. The machining of drums was done by a local machine shop and shoes were relined by a brake specialist, I informed them of the diameter difference and they finished the shoes accordingly. A bit of hand fettling of linings to ensure shoes fitted the drum snuggly, as I know that modern linings will not bed in quickly and this proved worthwhile on the first test run of the Carrier as I understand.

regards, Richard