Front brake caliper broken bolt (Freightliner XCR)

[J&JD]

If I am reading the markings correctly, this is a 12.9 metric bolt. Not very robust for this application...

Bolt Depot - Bolt Grade Markings and Strength Chart

www.boltdepot.com

At least there are 6 of them holding the caliper together.

 

[Joe Hogan]

Actually, the bolt head was discovered just before backing into the yard which means it was there when we left 3000 miles ago. What it looks like to me is that the bolt was over torqued or was perhaps was defective. The other 5 in the caliper seem fine. I’m going to go to Freightliner in Sacramento and see what they say. I need to have the coach serviced regardless.

May be a service tech attempted to comply with the Recall in my previous post or a TSB and put an impact on the bolts to tighten them. Being relatively soft 12.9 metric this one was stretched a bit thin...

 

[J&JD]

A quick follow up to our broken caliper bolt:
Just spent the day at Freightliner Sacramento Rv Service Center. Had our 48 month service performed (WITH AN APPOINTMENT). So nice to have a competent Freightliner dealer give appointments so you don’t have to leave the coach. Unfortunately, they were not able to replace the caliper bolt because, are you ready, the bolt was back ordered! Seems the whole front assembly is brought in from Germany so Freightliner does not stock the bolts…..go figure. The service manager could not source the bolt because of warranty issues. Good news is that the 5 remaining bolts are good and tight and the feeling is that all should be fine until a bolt is found.