Backing Plate - Team Camaro Tech
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post #1 of 11 (permalink) Old Aug 13th, 03, 03:15 AM Thread Starter
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Kevin
 
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I am doing a drum to disc brake conversion on my 67 Camaro and I started to put everything back together last night and ran into a problem. The backing plate I have has a cup attached to it and I am not sure if it is suppose to be there? When I mount my rotor and tighten the spindle nut the rotor does not spin freely. It is hitting on this cup (lip) on the backing plate? Did I get the wrong backing plates or am I mounting something wrong? Is the rotor suppose to fit inside of this cup?


Kevin
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post #2 of 11 (permalink) Old Aug 13th, 03, 03:56 AM
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I had the same problem on the driver's side of my 68. The splash shield or backing plate scraped the spindle. The manufacturer Tech Rep said they had not had that problem. I ended up removing the shield on both sides after several attempts to install, thinking I had done something wrong. My car is not yet back together and I would be interested in how you resolve this.

68 convertible, Grotto blue, 327 TH350,3.08 diff
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post #3 of 11 (permalink) Old Aug 13th, 03, 08:39 AM
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Are you sure it is the cup portion that is rubbing? I replaced the backing plates on my car and had to "massage" the lower portion of the plate with a dead blow hammer so the rotor would not rub against it. At first I thought the rubbing was coming from the center cup on the plate as you describe, but it was not.

Check the orientation of the backing plate to the rotor at it's edge. If the backing plate edge covers the rotor it needs to be bent back slightly to clear.


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post #4 of 11 (permalink) Old Aug 13th, 03, 09:18 AM
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Ditto, I had to persuade both of mine with a hammer as they were rubbing on the rotor a bit.


-Funk



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post #5 of 11 (permalink) Old Aug 13th, 03, 09:32 AM Thread Starter
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Kevin
 
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I am pretty sure its hitting the cup part of the backing plate. I would be able to spin it a little if it was just the sides of the plate. I mean i can not budge the rotor when the spindle nut is tightened. I am pretty sure I put the parts on the spindle in the correct order.

spindle - caliper braket - backing plate - rotor

Is the rotor suppose to go inside the cup on the backing plate??

Kevin

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post #6 of 11 (permalink) Old Aug 13th, 03, 10:06 AM
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Does it spin freely without the backing plate installed?

You aren't cranking down the spindle nut are you?


-Funk



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post #7 of 11 (permalink) Old Aug 13th, 03, 10:11 AM Thread Starter
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No CFunk just snugging it. I will go home tonight and take off the backing plate and see what happens. Thanks for the reply [img]smile.gif[/img]

Kevin

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post #8 of 11 (permalink) Old Aug 13th, 03, 11:17 AM
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Ya gotta ask.

Is it a 1 piece or 2 piece hub/rotor? Is it someones kit?

Let us know what you find as I am curious.


-Funk



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post #9 of 11 (permalink) Old Aug 13th, 03, 11:23 AM Thread Starter
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CFunk,

Its a 1 piece rotor and its a set of disc brakes I taken of a donor car (69 GTO). Everything is the original except for the backing plates. Ill let you know what I find out when I take the backing plate off and try it.

Kevin

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post #10 of 11 (permalink) Old Aug 14th, 03, 03:18 AM Thread Starter
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Well I went home last night and took off the backing plate and slide the rotor and no problem with rubbing. So I am sure the cup on the backing plate was the problem so I removed the cup. If you turn over the backing plate you can see where the cup is tacked on to the plate, so I just drilled out the tack and removed it. I put everything back together and no problems. I have no idea why the cup was rubbing the rotor. I just have a few extra small holes in the backing plate from the drilling, but I don't think it hurt.


Kevin

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post #11 of 11 (permalink) Old Aug 14th, 03, 06:40 AM
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Nice solution to a sticky problem.

Glad it worked out for you.


-Funk



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