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Brake Question - 240k

noddle
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72GT Enthusiast

72GT

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I had to put some rear brake shoes on my 240K last weekend,

I replaced then the same way they were originally placed,

But I'm not sure if this is the correct orientation,

ie swap the two shoes around (leading / trailing)

It's the Left side in these picture

The setup in your pictures matches the "Gregorys" 240K w/shop manual. Leading shoe friction material starts lower down the shoe and ends closer to the wheel cylinder.

Jim.

noddle Rising Star

noddle

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The setup in your pictures matches the "Gregorys" 240K w/shop manual. Leading shoe friction material starts lower down the shoe and ends closer to the wheel cylinder.

Jim.

Correct,

But after talking to an automotive teacher where I work, the leading shoe is the right hand shoe, so the shoes are the wrong way around, leading right side, trailing left side.

these pictures are for the left brake, forward direction is anti-clock wise

72GT Enthusiast

72GT

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OK. Out of interest, ask him if the position of the wheel cylinder , acting on either the top or the bottom of the shoes is a factor. I wondered as I checked a few different pics and diagrams. Unfortunately few described the direction of the view (left or right hand side of car) but the position of the wheel cylinder appeared to effect which shoe was the primary!

Just looking at a brake theory book (old!) the servo, and slight rotation action of the shoes described would seem to suggest the picture in the Gregorys (and your pictured setup) is correct!

I'm still trying to make sense of this and the different position of the wheel cylinder is the only thing that comes close to explaining it!

Anyone clear on drum brake theory? Now I'm curious :(

noddle Rising Star

noddle

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OK. Out of interest, ask him if the position of the wheel cylinder , acting on either the top or the bottom of the shoes is a factor. I wondered as I checked a few different pics and diagrams. Unfortunately few described the direction of the view (left or right hand side of car) but the position of the wheel cylinder appeared to effect which shoe was the primary!

Just looking at a brake theory book (old!) the servo, and slight rotation action of the shoes described would seem to suggest the picture in the Gregorys (and your pictured setup) is correct!

I'm still trying to make sense of this and the different position of the wheel cylinder is the only thing that comes close to explaining it!

Anyone clear on drum brake theory? Now I'm curious :dry:

Correct the placement of the wheel cylinder (stopping pin, or what ever it’s called) does make a difference,

The way he explained it to me was,

The leading shoe is the one that pushed against the pin when the break is applied, in this picture the right shoe would try to rotate anti-clockwise and push against the pin, leading shoe.

post-13098-1151622760.jpg

Edited by noddle

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