[Healeys] Brake drum theory question

[ggilliam at usol.com]

If the brake shoes are adjusted so that they drag, it is not a travel 
problem. There is either insufficient pressure, or the radius of the 
shoes does not match the radius of the drum, and therefore is a very 
small contact patch, so only a little friction area results, resulting 
in inadequate braking force.

On 10/13/2012 10:27 PM, Richard Ewald wrote:
> If the drums were off center when turned it would be instantly 
> obvious to the
> guy running the lathe.
> If he continued and actually turned the drum off center you would 
> would have a
> world class brake pedal pulsation.
> I agree with Dave that the master could be the problem. Also look at 
> the pedal
> and make sure the hole is not worn.
>
> Sent from my iPhone
>
> On Oct 13, 2012, at 12:53, fiat500f at aol.com wrote:
>
>> Brake drums - ugh!
>>
>> When a brake drum is turned (cut), how is the drum secured to the 
>> cutting
>> machine?  By the center hole, the lug holes, or the outside of the 
>> drum?  I
>> think I may have some seriously out of round drums, though they were 
>> cut
> (with
>> little use since) by the previous owner.  New master cylinder and 
>> wheel
>> cylinders, no air in the system, but I still have a long pedal 
>> travel (firm
> at
>> the bottom), but I can't get the shoes any closer without binding on 
>> the
>> drums.  I'm thinking the drum should be cut while being held in the 
>> same
>> orientation as it will be used on the car, with the lug holes, yeah? 
>> I'm
> also
>> thinking that the center hole is not necessarily central to the drum 
>> center
>> point of the shoes, but the lug nut holes will hold the drum exactly 
>> like
> it
>> will be held by the wheel hub.  Opinions.....
>>
>> - Paul B.
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