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Old 07-28-2017, 02:37 AM   #1
magman
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Default Is Right Right? Or is Left?

PA 22 with Drum Brakes.

2 Shoe ASSEMBLIES are marked as "Right" & 2 as "Left".

Do both of the Lefts go on Pilot Side?

Or?

Parts Manual unclear & Univair doesn't know.


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Old 07-28-2017, 04:16 PM   #2
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I would presume it will be obvious when you remove the old ones.


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Old 07-28-2017, 05:21 PM   #3
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They were removed & found Right on Aircraft Left Side.

Nothing Obvious.

The thought could be "Is it R or L looking at wheel?"

Things were working fine.
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Old 07-28-2017, 05:51 PM   #4
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Quote:
Originally Posted by magman View Post
They were removed & found Right on Aircraft Left Side.

Nothing Obvious.

The thought could be "Is it R or L looking at wheel?"

Things were working fine.
It's quite possible that the old ones were installed on the wrong sides. Shoes in drum brakes are designed to be somewhat "self-energizing" so that the torque generated when braking helps reduce the pressure needed. For cars this is done by locating the lining off center toward the pivot side vs the cylinder side.

Surely there are experts here that can answer your question specifically regarding aircraft drum brakes.
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Old 07-29-2017, 12:00 AM   #5
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Quote:
Originally Posted by Leigh View Post
It's quite possible that the old ones were installed on the wrong sides. Shoes in drum brakes are designed to be somewhat "self-energizing" so that the torque generated when braking helps reduce the pressure needed. For cars this is done by locating the lining off center toward the pivot side vs the cylinder side.

Surely there are experts here that can answer your question specifically regarding aircraft drum brakes.
I remember them as being called primary and secondary brake shoes. The primary had the shorter amount of lining, with a longer amount of lining on the secondary. The idea was that the primary lining would apply force to the secondary shoe while the secondary shoe was "cam-ed out" against the anchor pivot pin. This was intended to even out the amount of wear so that both shoes wore out at the same time.

The left side brake would have the shorter or primary shoe on the forward side (in the direction of automobile travel) and the secondary shoe on the aft side. I suppose the same idea would apply to the aircraft drum brake. The opposite wheel would have the primary shoe on the forward side also.
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Old 07-29-2017, 02:24 AM   #6
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They appear all the same length.

My guess the comments are correct regarding Servo Action.

Just hope for something specific PA 22
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Old 07-29-2017, 04:25 PM   #7
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Magman - Is it possible that the brake linings you have are marked differently on both sides of each shoe or lining? If so, then it would be feasible to install both shoes on the left side of the airplane with the left markings visible, and install both shoes on the right side with the right side markings visible. Not seeing a photo here just makes me wonder.
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Old 07-29-2017, 09:57 PM   #8
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I think the Shoes must be off to see R or L.

I believe all Linings are the same.

Difference is in the Shoe they are riveted to.

Manuals of that era are somewhat lacking in detail.

As long as they are off why not make Right er Correct?
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Old 07-30-2017, 07:01 PM   #9
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Call Joe Fleeman, Fleeman Flying Service, Lawrenceburg, TN. (931) 762-9222

Bob Bomar


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