1957 Big Brake backing plate spacer

[Dan P.]

They sell a 1/8 spacer to space out the backing plate from the knuckle to get the brake hose to clear.They are sold 2 at a time .Wouldn't you need a spacer on all four to keep the backing plate true to the drum.

[Philip C.]

Re: 1957 Big Brake backing plate spacer

Hi Dan only 2 spacers are used per car on both big and small brake, I assume the backing plates off set are a little bit different that's why the 1/8 difference between them. Phil 8063

[Mike E.]

Re: 1957 Big Brake backing plate spacer

I'm going from memory here. I know that the regular brake backing plates spacers are shorter than the RPO684/687 spacers. I assume that's why they sell the 1/8" spacers-to make up the difference.
Phil, I think I need to disagree with you here. There are two spacers on each front installation, so you would need 4 per car.
i just can't remember if the spacers are on the bolts with the castellated nuts, or the other pair of bolts at each spindle support to backing plate.

[Dave S.]

Re: 1957 Big Brake backing plate spacer

I'm going from memory here. I know that the regular brake backing plates spacers are shorter than the RPO684/687 spacers. I assume that's why they sell the 1/8" spacers-to make up the difference.
Phil, I think I need to disagree with you here. There are two spacers on each front installation, so you would need 4 per car.
i just can't remember if the spacers are on the bolts with the castellated nuts, or the other pair of bolts at each spindle support to backing plate.

They were not part of the bolt but were more like a sleeve than a washer and were insatlled on the engine side of the backing plate. As I recall they were 1/2" thick at least. They were on the top two bolts for sure but don't recall if the were also on the bottom two bolts. With the backing plate in front of you it would be easy to tell. I'll see if I have a good photo somewhere.

[Philip C.]

Re: 1957 Big Brake backing plate spacer

I stand corrected, there are 4 per car (the older I get The better I used to be) on the upper bolts with nut and lock washers none on the bottom with the castellated nuts. Phil 8063

[Dave S.]

Re: 1957 Big Brake backing plate spacer

I stand corrected, there are 4 per car (the older I get The better I used to be) on the upper bolts with nut and lock washers none on the bottom with the castellated nuts. Phil 8063

Here is a photo.

[Richard M.]

Re: 1957 Big Brake backing plate spacer

Here are some pics of a set retrofitted to a '56 I got up close and personal with last year.....

Rich
p.s. I reserve the right to admit I know nothing about big brakes but really like taking pictures of them.

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