[WANTED] Backing plate info

[barracudakid]

These 2 plates are identical
Same peg and center height
The area where the wheel cylinder attaches is different
Does it matter?

 

[Murray]

You may have one front and one rear. One plate has a wheel cylinder piston retainer. I think these were more common on rears.

 

[Professor Fate]

You may have one front and one rear. One plate has a wheel cylinder piston retainer. I think these were more common on rears.

The attaching bolt pattern is quite different on front plates vs rears. Center height and hole diameter are also substantially different.
Front

Rear

OP, my best guess is early vs late model backing plates- somewhat different but functionally interchangeable. I'm sure someone will correct me if I'm mistaken.

 

[barracudakid]

both are rears
you may be right about early vs late

 

[Mr. Sinister]

JMO but it looks like it’s lost the piece that is on the bottom one, the pinch weld looks like it let go.

 

[rbkt65]

i am no expert, but those are early(bottom) and late(top)

 

[davescuda]

There’s nothing wrong with it. Those are normal. I just ran into this a while ago trying to remember what the heck the difference was. Getting old. If you look in your 69 - 70 shop manual and look up rear brakes that’s how I figured it out.

 

[4mulas]

One is early one is later. The one with fingers is a design feature they put on them to prevent the pucks coming out of the wheel cylinders. Both will work the same

 

[barracudakid]

Thanks guys
Good info

 

[Jarlaxle]

I recall the top design was used (at least) into the 80s.

 

[Dana67Dart]

Without the tabs are 68 and older.

With the tabs are 69 and newer

Both are interchangeable.

The tabs only keep the cylinder pistons from popping out when the brake shoes are off.

2 different 10x1 3/4, 8 3/4 backing plates?