any ideas on what caused this?

[gtMc]

Below is a pic of the front driver side brake caliper, clearly some corrosion or abrasion took off the grey paint finish on the caliper. The other pic is the rear, that looks to be in fine shape. Its cosmetic on the front, as the brakes work fine.

Anybody else ever see this, or know what would cause it? Going to need to get this cleaned up, hate seeing it.

[inTgr8r]

for starters they're supposed to be black no grey.
Someone used a corrosive cleaner on them?

[dubsesd]

A strong acid cleaner would do that for sure. But the calipers are in fact supposed to be black, so the previous owner may have had them repainted at one point

[NYZ4Jack]

if it was repainted, they used non-high heat paint. constant high temp/cooling down will cause most paint to flake off metal surfaces. (we use heat guns to remove paint from steel work, they literally flake themselves off)

repaint them with caliper paint or engine spray paint and it should last a long time.

[gtMc]

Originally Posted by NYZ4Jack

if it was repainted, they used non-high heat paint. constant high temp/cooling down will cause most paint to flake off metal surfaces. (we use heat guns to remove paint from steel work, they literally flake themselves off)

repaint them with caliper paint or engine spray paint and it should last a long time.

OK thank you all. Interesting that they were painted (didn't know that orig was black - but yes you can see some black in the front caliper pic above). If you rub the silvery metal part, part of it is smooth, part of it is rough (as if it was ground or filed down).

Good point on the hi temp/cooling impact. Makes sense as I am starting to see the same paint corrosion on the other front caliper too, but much less so that the one shown above.

I am only investigating so I can prevent it from happening again after I fix it.

All this begs the question... do I want to just have them repainted properly, or put some different calipers on there.

[3002 tii]

Originally Posted by gtrinks

OK thank you all. Interesting that they were painted (didn't know that orig was black - but yes you can see some black in the front caliper pic above). If you rub the silvery metal part, part of it is smooth, part of it is rough (as if it was ground or filed down).

Good point on the hi temp/cooling impact. Makes sense as I am starting to see the same paint corrosion on the other front caliper too, but much less so that the one shown above.

I am only investigating so I can prevent it from happening again after I fix it.

All this begs the question... do I want to just have them repainted properly, or put some different calipers on there.

Define "properly" - if you mean professionally, no. G2 caliper paint kits have the best finish and because it's brush application, you don't need to worry about overspray. For normal street use, I'm certain they'd hold up fine. But on the track, not so sure... but then again I really don't know ANY paint that would hold up track usage (aside from powdercoating which is expensive and requires all brake components to be removed).

Me personally, I'd wait till next time I have to swap pads/rotors and try the G2 stuff then. You could let the caliper hang and not have to worry about rebleeding. Or find a used set of calipers on fleebay and send those to get powdercoated.

[gtMc]

Properly but not necessarily professionally unless im feeling lazy and dont want to do it myself. Yes, Would try to coincide it with other brake work too. Good call on G2 thats an easy and cheap solution.

Didnt even think of the powdercoating route. interesting idea as well. And then there is the 'all new' route.

[RevsPlease]

Originally Posted by gtMc

Properly but not necessarily professionally unless im feeling lazy and dont want to do it myself. Yes, Would try to coincide it with other brake work too. Good call on G2 thats an easy and cheap solution.

Didnt even think of the powdercoating route. interesting idea as well. And then there is the 'all new' route.

Stoptech or Brembro BBK. Two birds, one stone

[gtMc]

Originally Posted by RevsPlease

Stoptech or Brembro BBK. Two birds, one stone

Yep, I like your thinking.....