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Brake backing plates |
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1973gts 
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Joined: 05-March-2018 Location: Grand Rapids Mi Status: Offline Points: 616 |
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 Topic: Brake backing platesPosted: 15-January-2021 at 3:14AM |
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I am redoing my rear drum brakes and have a question on the condition of the backing plate. Upon getting it off I found the following condition on two of the flats.
  Can I just file these spots down, have to have them filled in, of find some new plates? thanks. - Dave
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Dave - 1973 GTS N code
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72 RS 351
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Joined: 04-September-2014 Location: Knoxville TN Status: Offline Points: 2767 |
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Posted: 15-January-2021 at 3:24AM |
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That is common for those drum backing plates over a lot of miles. I had that happen on my 93 Explorer and the wear was partially through. I had my truck at a friend's body shop, and he had most shop tools. He welded the holes in and left a little pad like you have on those. I ground it down flat, the protrusion, so the brake linings would ride there as intended. I don't think there is a better answer than to add metal with welding. But yours don't look bad at all yet. I would leave them as they are for now, and just check them any time the rear tires come off.
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Don
73 Ranchero "Sport 72 front end", floor shift/console, planning EFI 7000+ rpm 351-4V &4R70W 73 Ranchero GT 351C-4V &4R70W for sale later. 92 Lincoln Mark VII SE GTC, OBDII 347/4R70W |
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72FordGTS
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GTS.org Admin Joined: 06-September-2005 Location: Ontario, Canada Status: Offline Points: 5854 |
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Posted: 15-January-2021 at 11:48AM |
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I agree with Don, welding to add material would be the best fix. That said, I had the same issue on my old truck. It would actually cause the shoes to hang up sometimes. So I just ground them flat and it worked fine. Mind you, it had well over 200K miles at that time and that level of repair was good enough.
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Vince
1972 Ford GTS Sportsroof - Survivor, One Family car GTS.org Admin |
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Rockatansky
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Joined: 30-July-2010 Location: On The Road Status: Offline Points: 6073 |
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Posted: 15-January-2021 at 12:23PM |
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measure original height, weld the grooves up and grind smooth to measured height going forward check your brake shoes for burrs where they ride on the backing plates, file / sand smooth and use a smear of Lucas red-N-Tacky #2 on the pads |
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72 GT Ute
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1973gts
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Posted: 15-January-2021 at 4:15PM |
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Not sure what caused the problem but the self adjusting cable on this one was broke. The other backing plate is a little worn but not near as grooved as this one. I smoothed them out so I don't think they will hang up. After the car is back on the road I'll see how they do, I'm putting all new shoes, drums, and hardware on them. Thanks for all the input and I'll pick up some of the Lucas Red n Tacky to use on them.
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Dave - 1973 GTS N code
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Rockatansky
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Posted: 16-January-2021 at 5:31AM |
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if the pads are not restored to original height your brake shoes will not meet the drum evenly, brake performance will be a fraction of what it should be due to partial contact until you put you foot through the floor or the lining material wears unevenly to match the angle of the support pads deburring the contact area on the shoe is important to prevent further wear
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72 GT Ute
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Greg73Oregon
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Joined: 23-February-2021 Location: Roseville, CA Status: Offline Points: 232 |
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Posted: 23-February-2021 at 11:23AM |
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After welding/grinding - I used various polishing grits to a shiny mirror surface. And then, put a very small amount of silicon grease over it.
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GKF
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