Rear upright backing plate
Discussion
Has any one else found the alloy backing plate had corroded quite badly on the mating surface? I guess it’s sacrificial corrosion where it mates to the uncoated steel of the hub, but it was a good miller meter thick & once I’d scraped it all off & tried offering it back up it wouldn’t easily go. So I’m trying to work out if there was always a small gap on the calliper mounting side & the corrosion filled that gap, or if the corrosion forced the backing plate away. It would seem there was always a gap as both the backing plate & hub were flat after I’d removed the corrosion.
Both my uprights were like this, has any one else found this too?
Both my uprights were like this, has any one else found this too?
That corrosion is not unusual and I seem to remember someone posted a thread because they couldn't seperate the two components.
Re the gap, The mating surface of the plate and the machined face of the upright/hub carrier should be in contact (once the corrosion is removed) with no gap. Obviously the lip on the inner edge of the backing plate should fit snugly into the hole on the hub carrier or it may sit proud.
However if you meant between the backing plate and the caliper mount that is welded to the side of the upright then I don't think having a gap is a problem.
Disclaimer...this is from memory of course and I'm not going to take mine apart again to check!
Phil
Re the gap, The mating surface of the plate and the machined face of the upright/hub carrier should be in contact (once the corrosion is removed) with no gap. Obviously the lip on the inner edge of the backing plate should fit snugly into the hole on the hub carrier or it may sit proud.
However if you meant between the backing plate and the caliper mount that is welded to the side of the upright then I don't think having a gap is a problem.
Disclaimer...this is from memory of course and I'm not going to take mine apart again to check!
Phil
Edited by FeelTheNoise on Sunday 16th January 18:03
FeelTheNoise said:
That corrosion is not unusual and I seem to remember someone posted a thread because they couldn't seperate the two components.
Re the gap, The mating surface of the plate and the machined face of the upright/hub carrier should be in contact (once the corrosion is removed) with no gap. Obviously the lip on the inner edge of the backing plate should fit snugly into the hole on the hub carrier or it may sit proud.
However if you meant between the backing plate and the caliper mount that is welded to the side of the upright then I don't think having a gap is a problem.
Disclaimer...this is from memory of course and I'm not going to take mine apart again to check!
Phil
That sounds right, I didn't try too hard to get the backing plate to go back on too hard as I would only have to have taken it off again. With a little persuasion it should go back on then - Thanks Re the gap, The mating surface of the plate and the machined face of the upright/hub carrier should be in contact (once the corrosion is removed) with no gap. Obviously the lip on the inner edge of the backing plate should fit snugly into the hole on the hub carrier or it may sit proud.
However if you meant between the backing plate and the caliper mount that is welded to the side of the upright then I don't think having a gap is a problem.
Disclaimer...this is from memory of course and I'm not going to take mine apart again to check!
Phil
Edited by FeelTheNoise on Sunday 16th January 18:03
No I didn’t mean between the calliper mount, as you say there should be a gap there. I guess that is where the water gets in to start the corrosion
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