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Old 05-08-2014, 06:14 PM   #1
jproy12
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Default Rear backing plate rusted out!

So my rear backing plates are pretty rusted out, almost to a point where they might be falling of. Can they just be removed without any negative impact? I live in Canada, where we have lots of salt on the roads and everything. The other option would be to swap out hubs.

I'm talking about part # 17/18 in this picture:
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Old 05-08-2014, 06:20 PM   #2
Big-E
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You have to remove the hub to remove the backing-plate from the knuckle.
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Old 05-10-2014, 08:46 PM   #3
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nah, you can drill out the spot welds and pull the backing plates off.
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Old 05-10-2014, 08:57 PM   #4
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Originally Posted by fastnoypi View Post
nah, you can drill out the spot welds and pull the backing plates off.
No need to replace them?
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Old 05-10-2014, 10:10 PM   #5
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Without a photo I am suspecting it's just the outer ring portion of the backing plate that is rusting to pieces, the usual case. If so, do as already noted and drill/grind the spot welds and pull what is left of the outer ring away.
There no real problem with leaving that ring off, it just exposes a bit of the inner disk rotor surface. An outer ring is not separately serviceable anyways. To replace it you would have to replace the entire backing plate which is a bit more work.
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Old 05-11-2014, 01:50 AM   #6
KamekazeSTI
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I took my front dust covers off on my car aswell and I was living in northern ontario. Had no trouble at all with them off. I only took them off because they had minor ammounts of rust on them and felt they should come off rather then media blasting the surface and repainting them.
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Old 05-13-2014, 04:48 PM   #7
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Originally Posted by jproy12 View Post
No need to replace them?
i have had mine off my rears for the past 8 years to do the H6 rear brake conversion, no negative effect that i've experienced.
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Old 05-14-2014, 12:43 AM   #8
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Quote:
Originally Posted by fastnoypi View Post
nah, you can drill out the spot welds and pull the backing plates off.
Correct, but only if the dust shield portion of the backing plate is compromised.

OP- If the thicker part of the plate where the caliper itself bolts through is solid, then knock the dust shields off. No issue. If the plate itself is soft at all, it should be replaced. If the plate (not the shield) were to fail, your caliper can get tossed around, potentially losing control of the car.

With that said, it's likely the plate is fine, and the shield is wasted. Only good way to inspect them is to pull the caliper and rotor and have a look-see.
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Old 05-14-2014, 08:46 AM   #9
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Quote:
Originally Posted by projectQWKSLVR View Post
Correct, but only if the dust shield portion of the backing plate is compromised.

OP- If the thicker part of the plate where the caliper itself bolts through is solid, then knock the dust shields off. No issue. If the plate itself is soft at all, it should be replaced. If the plate (not the shield) were to fail, your caliper can get tossed around, potentially losing control of the car.
yes, the tack welded dust shield portion only. The thicker part of the plate houses the drum of the e-brake iirc..its not going anywhere and neither your caliper. Your rear caliper is bolted to with 14mm bolts so it wont get tossed around.
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Old 05-14-2014, 11:44 AM   #10
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Quote:
Originally Posted by fastnoypi View Post
yes, the tack welded dust shield portion only. The thicker part of the plate houses the drum of the e-brake iirc..its not going anywhere and neither your caliper. Your rear caliper is bolted to with 14mm bolts so it wont get tossed around.
The caliper most certainly will get tossed around if the backing plate is rusted through, it's only a matter of time. The caliper hanger is threaded, so the only thing holding it to the car is the backing plate itself. The plate is fairly rugged, but only about an 1/8" thick. Road salt is nasty, in ten or more years it could easily have eaten away at the plate. As I stated above it IS NOT likely the backing plate is compromised, but if it is REPLACE IT! The only way to know for sure is to inspect it.
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Old 07-20-2019, 04:53 AM   #11
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Backing plates bolts to the knuckle. Caliper bolts to the knuckle, not the backing plate. If backing plate is rusted, the concern is your E brake not having contact points to ride on. Your caliper will never get loose because of a backing plate. The dust plate is connected to the backing plate. Dust plate for dust, backing plate for e brake. So, ya pull off the dust plate. No problem. Bad backing plate, bad e brake, caliper just fine.
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Old 07-20-2019, 09:53 AM   #12
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Hello 2014...

And NO that is not how the rear caliper attaches to the OPs car. The backing plate is four bolted to the rear knuckle and the caliper is two bolts to the backing plate.

Front brakes are a different story, but that was NOT the focus of this thread.
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