Jump to content

Can anybody help me figure out rear brake backing plates


Recommended Posts

Hello,

 

Can you anybody help me figure out a rear backing plate situation on my 1946 Dodge Truck that has got me really baffled. 

 

I purchased a 1946 Dodge Truck 1/2 ton civilian last year and when I went to rebuild the rear brakes I found out they were from a 1953 Plymouth?  I purchased the new wheel cylinders from a vendor that deals with vintage Chrysler products parts and found out the wheel cylinders would not fit the Plymouth backing plates.  Ok so then I thought I would just go out to E-bay and buy some backing plates that are the correct ones for my 1946 Dodge truck.  I purchased backing plates from two separate people and neither one of them fits the wheel cylinders I bought.  The wheel cylinders are either too large for the hole it mounts to or the mounting bolt spacing is off.  Also one wheel cylinder's mounting bolt pattern is at the top and the other is at the bottom.

 

What is the size center to center for the mounting bolt holes for a proper 1946 Dodge truck. I guess the next time I go  out shopping for some rear backing plates I need to ask somebody what the mounting hole center to center dimensions are as well as the center hole where the wheel cylinder goes through.  I have some pictures I have attached. post-8046-0-26311100-1456434240_thumb.jpgpost-8046-0-34992300-1456434269_thumb.jpgpost-8046-0-56258100-1456434283_thumb.jpgpost-8046-0-90034200-1456434301_thumb.jpgpost-8046-0-47723300-1456434323_thumb.jpgpost-8046-0-72304700-1456434338_thumb.jpg

 

Thank you,

 

Harry

Link to comment
Share on other sites

The issue is probably that rather than just swapping brakes someone swapped the entire axle. Although that's not the easiest thing. Can you post a picture or two of the entire rear end?

Link to comment
Share on other sites

I'm guessing the old ones are not 53 Plymouth for the old plates unless they had an upper and lower wheel cylinder.

Are the 2 plates the two you purchased? If so, their a mix match of parts again...problem with eBay is they won't guarantee fit. I would have just looked for wheel cyls for the original plates....RockAuto has pictures and listings for a lot of these type parts

Link to comment
Share on other sites

Thanks for the replies.  Yes the two plates are the ones I got off of E-bay.  I have attached some more pictures showing the rear end and some more details on the plates.  The plates that were on the rear end had very small wheel cylinders which make me a little uneasy about having for brakes.  In the picture with all the backing plates, the two on the bottom of the photo are what was on the rear end and appear to be from a later model vehicle that had very small bore wheel cylinders, the two towards the top of the photo are what I purchased from E-bay.

 

Thanks again,

 

Harry 

post-8046-0-18632500-1456636007_thumb.jpg

post-8046-0-22637000-1456636013_thumb.jpg

post-8046-0-94113300-1456636019_thumb.jpg

post-8046-0-01197300-1456636024_thumb.jpg

post-8046-0-31362200-1456636028_thumb.jpg

post-8046-0-95079700-1456636036_thumb.jpg

Link to comment
Share on other sites

I think your rear axle and backing plates are original and correct and the new wheel cylinders are the wrong ones.

  • Like 2
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.

Terms of Use