unusual caliper bolt question

[djomlas]

on the front calipers, the top bolt broke right where the tool goes to open it up. from the start it was realllly hard to turn.

bottom one is very easy to unscrew once loose.

same thing on the other side, passinger side front, but i didnt even want to try and get it out, so left it alone.

my Q is, is there a reason why the 2 top ones are sooo hard to get out, to the point where the bolt head breaks?

i got new ones, but cant get this one out. (same color as my car strangly enough hehe)

ill go and get it extracted tomorrow morning, but just weird.

any ideas?

[RFM]

The trouble is oxidation and heat, sometimes you can fix it with a threat insert, sometimes you have to buy a new hub.

[jporter]

I had a similar problem. I believe the bolt extends out of the hub and the threaded end gets dirty or corroded.

[Highlander]

I had a similar problem. I believe the bolt extends out of the hub and the threaded end gets dirty or corroded.

Ding, ding, ding, we have a winner!

A few threads can protrude through the hub and collect dirt/grime (they have an anti-corrosion coating that has survived many Colorado winters on my car, so corrosion shouldn't be a big problem). If you simply unscrew the bolt, the dirt/grime messes up the nice soft aluminum threads in the hub. You should always clean any protruding threads prior to removing the calipers.

Thanks for bringing this up, I'm just about to put the stock suspension back on my car had had forgotten about this potential problem. Your pain might just have saved me some. THANKS!!! :cheers: