caliper bracket bolts

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  #1  
Old 06-24-07, 05:26 PM
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caliper bracket bolts

I want to know what you guys think about a 14mm (head size) caliper bracket bolt being torqued to 100 ft lbs? I helped a friend of mine do front pads and rotors on his freelander and he insisted this is what the torqe spec is for it. This info supposedly came from a rover tech who also said they usually air gun these bolts on. I've done plenty of auto work before including lots of brake jobs and never seen a bolt that size get torqued that high. Maybe 80 lbs, tops. Then again I never had the pleasure of working on a Rover before. thanks
 
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Old 06-24-07, 05:54 PM
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100 is excessive and probably will cause problems sometime in the future. Typically the caliper bolts are around 75ftlbs, pins around 25, and lugs around 100.

These mechanics air guns have a preset torque limit most of the time.
 
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Old 06-24-07, 08:14 PM
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Metric Bolts
Maximum Torque, in foot-pounds, for clean, dry threads
Check your Shop Manual !

Bolt size Low Grade Grade 8.8 Grade 10.9
6mm-------3-5-----------7---------10
8mm-------8-12--------17--------24
10mm------15-22--------33---------47
12mm-------39----------59----------83
14mm-------60----------101---------131
16mm-------60-94-------146---------202
18mm-------60-130------201---------283
20mm-------166-188-----285---------401

--------------------------------

take notice that a bolt with a head size of 14 mm is (I beleive) an 8 mm bolt. There is also one grade higher than those listed. An 8mm bolt in a 12.9 grade would have a torquing value of 29 foot lbs.

an 8mm bolt is about equal to the size of a 5/16 standard bolt.

Seems like 100 ft/lbs is a bit overkill.
 
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Old 06-25-07, 11:22 AM
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A friend of mine who's a mechanic for a foreign car shop e-mailed me the specs. 70 ft lbs max with locktight on the threads. He said just back them off and retigten. He's seen guy's forget to reset air guns and put them on to 150 without breaking so even if he left them at 100 it's not the worst thing. thanks
 
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