Need help..710 goon brake shoes

[datzenmike]

Have found during my diff swap that the RR shoes are worn out. I assume at 51K they are on correctly and are likely the original. I have replacements that look the same but while checking I found conflicting info on leading and trailing shoes.

 

1/  Leading shoe always has a shorter lining... well my shoes are both the same length lining.

 

2/  Leading shoe is closest the wheel cylinder pushing in the direction of rotation. (see 3/)

 

3/  Leading shoe is always to the front.... Maybe on vehicles with the wheel cylinder at the top but mine is at the bottom. This would be reversed.

 

Two of my shoes had brake lining right up to where the wheel cylinder is. The other two the lining begins several inches away from this.

 

 

 

Here are my shoes. Adjuster at top and wheel cylinder at bottom  If wheel rotation is clockwise are these correct or not? Yes or no isn't good enough need to know why.

 

[510freak]

Is this a trick question?

 

 

 

The shoes look like they were made on a either a Friday aft,or Monday am., to me at least

[laotsu]

I think you have it right, because the piston will push the shoe forward so you want the lining material as close to the piston as possible. 

 

wait no, it looks like the one marked Fore has thicker lining. so flip them both and you should be good.

 

I mean put the For one in front but upside down from where it is now and the same for the other one.

 

wait that wont work either.

 

 

you have it right.

[MicroMachinery]

Unless Datsun brakes function completely opposite of how other brake drum applications were designed, you have it right. What happens is, as the friction material on the shoes contacts the clockwise spinning drum, the friction will cause the shoe on the right to want to twist clockwise along with the drum, causing a servo action which will transfer through the wheel cylinder(which slides back and forth), and cause the shoe on the left to move outward and also clockwise. The positioning of the friction material on the shoes aids for optimum contact. It's a little difficult to explain in words.. much easier to demonstrate in person. Perhaps this will help paint a picture for you:

 

[datzenmike]

So far I'm with you micro.

 

The left shoe is then the leading shoe as it has a rotational assist and grabs on more easily. (even though it is to the rear of the vehicle)

 

Now what about the different positioning of the lining? I can position it as shown (further) or closer to the wheel cylinder. (at the bottom)

 

[datzenmike]

Still need some verification.

 

The wheel above turns clockwise and brake cylinder is at bottom adjuster at top.

Left shoe is pushed in the direction of rotation and gets a servo assist.

Should the shoe lining be closer to the wheel cylinder (like the right shoe)or farther away like the one shown... and why??? Both linings are the same length just mounted in different locations on the shoes.

[510freak]

Still looks like a Late Friday early Monday assembly

 

The material(metal) that the shoes attach to is reversed ,Flip that(take it of the metal that "attaches" to the backing plate) and it should match the one on the right

 

 

^^

**edit,this is what 510 brakes look like

 

Also 510 wheel cylinders are on the bottom(realm post)

 

 

 

Raybestos pn 359PG(listed for 76 710 goon)

Pic

[datzenmike]

On, the 710 and 610 rear shoes are made this way and are staggered. I just found a picture in my 610 FSM that clearly shows a driver's side rear wheel, so I know the direction of rotation. The front facing shoes have the lining closest to the bottom wheel cylinder. The rear facing shoe has the lining farthest away from the bottom wheel cylinder. As the rear facing shoe moves in the direction of rotation it receives a drag or pull from the moving drum that is referred to as 'self energizing'. This shoe does more work than the front shoe. Clearly in this picture the rear most shoes (either side) are the 'self energized' ones and have the lining furthest from the cylinder. For now I'm going with this.

 

Lou, you are right some shoes are identical left to right, but my '74 and '76 shoes plus these replacement ones are staggered. Two are closer and two farther away as shown. If the lining looks thicker on one it's because it's in sunlight.

 

 

Additionally in the picture the front facing shoe is marked FORE the other in marked on the other side and says REAR. The confusion was hearing about leading and trailing shoes.