Drum brake backing plate repair.

[Ty'1987]

I have an 87 v1500 with rear drums, which I am replacing with all new parts. The backing plate, which mounts to the axle is very worn and I will need to have new nibs welded on to let the shoes rest properly. Is it gonna be cheaper to have these repaired or replaced?

I googled the part under a couple different names but I only come up with disc brake backing plates. Anyone got a part number or more accurate part name?

 

[bigtalljohn13]

Dorman part #13867 should be the correct part. Have your local parts store run the number. i found them on amazon.com for $14.99.

 

[89Suburban]

**** that is a good price. Good info here guys.

 

[Ty'1987]

You rock John! I just confirmed that part # with dorman. And autozone also carries these, 14.99 there with one day delivery to store.

 

[89Suburban]

Give that man some reps

 

[Ty'1987]

I wish I could! I dont know how..

 

[Ty'1987]

I got my plates in yesterday, and I noticed first thing that its smaller than oem, and with no mounting holes or parking brake cable hole. I will drill these out and attempt the install.

I'm also repacking the wheel cylinder bearings and replacing oil seals while I have the axle shafts out. To do this I have to open the differential case to unlock them.

When I put the case back on, can I use RTV silicone "make a gasket" or should I buy the actual gasket?

 

[89Suburban]

That sucks about the backing plate. RTV is fine for the cover. I usually bead around the entire circle them circle every bolt hole. Let it skin up before installing the cover. I got a write ups in the tech section for 10 bolts with the wrench sizes and capacity if it helps.

 

[chengny]

For 9.5" ring gear axle:

034 PLATE. Brake Flange. Brake Flange/Backing.

$64.06 14056176

For 8.5 gear axle:

PLATE. Brake Flange. Brake Flange/Backing.
PLATE,RR BRK BKG(W/13 X 2.50 BRKS)(INCLS PLT & REINF). Required: 02
For: G3 PWR BRK SYS(JB7),HYD PWR DISC/DRUM BRK(JD7) (1992-1996) (1992 - 1995). $66.30 14056175


Nalley's


http://parts.nalleygmc.com/showasse...1987&ukey_category=19393&ukey_trimlevel=15184

 

[Ty'1987]

Thanks for that man that's what I should've bought!!

I have already drilled out the universal backing plates, though so there's no going back. I hope they do just fine, might have to fiddle with the shoe rests but I haven't checked them yet. I just no crap fills my drums because of extra space between them and the backing plates.

 

[chengny]

Take the extra time and get a couple of coats of POR-15 on them.

That foreign steel is nothing like what was used to manufacture the OEM plates. They will waste away in no time if left uncoated.

 

[Ty'1987]

Good to know, does anyone know of a big name retailer that sells it? I've looked but can only find it online.

 

[MrMarty51]

What I have done to backing plates that have grooved on the shoe pad is to fill them with weld then grind them back down to the original heighth/level.
I have done some that was real bad, mostly to see if I could getit rightit.

 

[Ty'1987]

You know Marty, that would be an ideal repair to me. I don't weld though I'd like to start; this looks like an easy project to begin on. I have been looking at a 100A mig/fluxcore welder for body/frame work.

Will flux core welding work on this job? Or is arc welding better?

 

[Ty'1987]

http://www.astrosafari.com/viewtopic.php?f=45&t=6030

I found this in a search to answer my question. This guy uses a stick welder. Though I think I'll just make the new plates work, and worry about welding another day.