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  84-87 front brake caliper slider bolt thread and pitch???

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84-87 front brake caliper slider bolt thread and pitch??? by FIEROPHREK
Started on: 01-15-2015 12:08 PM
Replies: 5 (274 views)
Last post by: FIEROPHREK on 01-16-2015 11:08 AM
FIEROPHREK
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Report this Post01-15-2015 12:08 PM Click Here to See the Profile for FIEROPHREKSend a Private Message to FIEROPHREKEdit/Delete MessageReply w/QuoteDirect Link to This Post
So I'm working on a brake swap and need info on the caliper slider bolts thread pitch. I tried matching it up to the thread wall at the local lowes and come to the conclusion it is a 7/16 bolt but the thread pitch is what is stumping me. The wall had a 14 tpi and a 20 tpi. I used a thread per inch gauge and found it to not match 20, 18, 16, or 14 threads per inch. none of the taps that are available from grainger suggest that 18, 16 tpi's are even available. So did GM use some sort of magical mystery tap thats proprietary to them? Is my bolt stretched? Thanks for the help.

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Report this Post01-15-2015 12:46 PM Click Here to See the Profile for 85 SE VIN 9Click Here to Email 85 SE VIN 9Send a Private Message to 85 SE VIN 9Edit/Delete MessageReply w/QuoteDirect Link to This Post
It's metric. I think it's M11 x 1.5. It should be 10.8 hardness, but good luck with that. There are many sources for these, but they're all going to be 8.8 with hex socket heads. Best to use the ones you have.
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FIEROPHREK
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Report this Post01-15-2015 02:03 PM Click Here to See the Profile for FIEROPHREKSend a Private Message to FIEROPHREKEdit/Delete MessageReply w/QuoteDirect Link to This Post
I was thinking it might be metric as well but i've never seen a M11 bolt. I will reuse my slider bolts but i need to tap my my bracket. Thanks!

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ARCHIES JUNK IS FASTER THAN SHAUNNA'S JUNK

12.3 is faster than a 13.2

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fierosound
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Report this Post01-15-2015 02:12 PM Click Here to See the Profile for fierosoundClick Here to visit fierosound's HomePageClick Here to Email fierosoundSend a Private Message to fierosoundEdit/Delete MessageReply w/QuoteDirect Link to This Post
You don't buy a regular hardware store bolt for brake calipers.
Any Auto Parts store should be able to get you proper replacements.
Part numbers: http://www.rockauto.com/cat...49107,parttype,10281

What brake swap?

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[This message has been edited by fierosound (edited 01-15-2015).]

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FIEROPHREK
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Report this Post01-15-2015 02:17 PM Click Here to See the Profile for FIEROPHREKSend a Private Message to FIEROPHREKEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by fierosound:

You don't buy a regular hardware store bolt for brake calipers.
Any Auto Parts store should be able to get you proper replacements.

Part numbers: http://www.rockauto.com/cat...49107,parttype,10281



I don't need the bolt, I need the thread size for the slider bolt so that I can tap my bracket for my brake mod.

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ARCHIES JUNK IS FASTER THAN SHAUNNA'S JUNK

12.3 is faster than a 13.2

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FIEROPHREK
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Report this Post01-16-2015 11:08 AM Click Here to See the Profile for FIEROPHREKSend a Private Message to FIEROPHREKEdit/Delete MessageReply w/QuoteDirect Link to This Post
Went to the local mom and pop hardware store and found a m11x1.5 tap in about 30 seconds! Love those mom and pop stores!

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ARCHIES JUNK IS FASTER THAN SHAUNNA'S JUNK

12.3 is faster than a 13.2

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