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07-13-2005, 12:18 PM | #1 |
Scooby Guru
Member#: 37359
Join Date: May 2003
Vehicle:2003 WRX |
Caliper bolt problem
Last night I sheared off the small bolt that holds the caliper body to the sliding lock pin (edit: while trying to remove it). So, after finding that none of the local dealers stock the pin and bolt, I'm sitting waiting for them to be ordered and wondering if this happens a lot.
It seems like I'm often taking these bolts out to check the pads, remove the rotors, or replace wheel studs. They have given me a scare before but this is the first time they've actually sheared, and I'm pretty sure I'm not over-torqueing them. I'm thinking of putting some brake caliper grease on them next time and backing off a few ft/lbs on the t-spec. Does anyone else have problems like this?
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Last edited by leecea; 07-13-2005 at 12:49 PM. |
07-14-2005, 09:17 AM | #2 |
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Location: Oxford UK
Vehicle:2000 5 door turbo Silver |
I wouldn't use caliper grease. If it's what I think, it's for lubricating the rubber seals.
I use a copper grease or wax corosion inhibitor. ISTR that the original bolts are treated with Loctite to stop them coming loose. I've never known that happen even with lubricated bolts but it's your decision. |
07-14-2005, 01:46 PM | #3 |
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....if you are breaking these bolts, you are doing something wrong....like over torquing them....are you using a torque wrench????
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07-14-2005, 03:10 PM | #4 |
Scooby Specialist
Member#: 90156
Join Date: Jun 2005
Chapter/Region:
NWIC
Location: Auburn, Wa
Vehicle:1986 Syncro Vanaru 07 SV650 |
Antiseize the bolts on reassembly.
Even if you are overtorquing them, it is not nescessarily the fault in this case. Corrosion is the number one cause of material failures worldwide and it very well could have seized up the threads due to some small amount of moisture or other contaminants. Another thing that happens to these bolts is called stress corrosion cracking. The torquing, above or below specs, of the bolt actually stretches open grain boundaries within the bolts crystal structure at the surface allowing moisture to affect these highly active areas causing corrosion that will denegrate the ultimate strength of the bolt. Just throw some antiseize on them before you torque them down to specifications with an accurate torque wrench. |
07-14-2005, 05:43 PM | #5 |
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....I just did my rear brakes on my '02 and those bolts were clean and dry and not corroded in any way.
.....I'd have to say overtorqued. |
07-15-2005, 10:03 AM | #6 |
Scooby Specialist
Member#: 90156
Join Date: Jun 2005
Chapter/Region:
NWIC
Location: Auburn, Wa
Vehicle:1986 Syncro Vanaru 07 SV650 |
SCC is just a theory for failure in this case. At this point all you can do is reinstall new bolts at the correct torque and carry on.
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07-16-2005, 02:15 PM | #7 |
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Tri-State
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Vehicle:'06 WX8 59E |
I don't remember the torque specified for the "lock" and "pin" bolts but it's rather small. Those bolts do not carry any load during braking.
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07-16-2005, 02:56 PM | #8 |
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