You should periodically check the torque on the two hex head bolts used to attach the calipers to the brackets. Torque was given as 36-37 ft lbs.

As you know they were coated with dried loctite. Ater exposure to heat and pressure, it must thin and spread out causing the torque to be reduced.

Twice I checked mine and they were a little loose.

Has any one else checked theirs?

 

i will check mine tomorrow

 

If they were loose twice I would pick up some high temp thread lock sealant. Lots of options at McMaster-Carr.

 

How often should they be checked?

Example:

2,3,4 times a year?

 

If the fasteners were originally bare and dry, and I was using my own wet loctite, maybe once after a little use.

But these fasteners had dry loctite on them which was a first for me. They only tightened about 1/4 turn during the retorque testing the first time. On the second test, a couple did not move at all and the other two moved some.

 

Use Nord-Lock Washers - they're life-savers.

 

depends. we've endurance raced the same car for 3 years, and the racing bit does not apply so much as the running the same car long term part. we do rebuild the suspension every season, and then it gets nut and bolt checked a couple times after that

basically if you check the same car over and over, you'll see that some things require more attention than others.

for example we know to check the lug nuts every pitstop, because if one loosens it'll start snapping wheel studs.

in theory you'd write this down. or make a "pre flight" list. we didn't really write anything down, but we've rebuilt the damn car so many times we just know what to do when it comes off the trailer

 

I would recommend replacing the bolts with safety wire bolts.

 

^^I don't think there's any need to replace the bolts. I was able to get maybe 1/8th turn out of each bolt by really cranking down on them. After a few years, three DGRR events, and three track events, mine were still tight enough for my peace of mind.

Btw, thanks for posting this up Chuck. A good reminder to not take stuff like this for granted, esp if the braking system has been heat cycled via track use.

 

^ Thx for the input Rich! So I think torquing them once a year should be sufficient with limited track use. I currently don't have these but it's good to know for future reference.