[TR] caliper bolts

Dave1massey at cs.com Dave1massey at cs.com
Wed Oct 3 15:24:26 MDT 2007


In a message dated 10/3/2007 3:19:00 PM Central Daylight Time, 
jrmcarthur at verizon.net writes: 
> Good day to all! Can anyone tell me why the bolts that mount the caliper to 
> 
> the vertical link cost almost $10 apiece from Moss? That is $39 and change 
> for 4 bolts!What is so special about them? As far as I can see, they are 
> 7/16" Fine thread by 1 1/2" long. Please, someone shed some light on this 
> for me. Thanks!.......Jim McArthur- CF17672U 
> 
Is your life worth $40?   These are special bolts in that they are of the 
strength required and they have shoulders that are the appropriate diameter and 
length.  Buying off the shelf bolts, even hardened ones, they will not have 
shoulders that are the right length and possibly the right diameter. 

The load on these bolts is in shear.  When you step on the brakes the 
calipers apply a torque to the brake rotor and the bolts take up the reactionary 
torque.  This force is transmitted from the bore in the calipers to the shoulder 
of the bolts and then to the caliper mounting brackets on the vertical link.  
Don't compromise this interface, your life may depend on it.

Besides if you buy 7/16 UNF grade 8 bolts at the hardware store they'll cost 
you $3 or $4 anyway.  Pay the extra and get the right parts.

Dave


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