Brake Line failure

#1

I figured out why I didn’t make trun one at CPM in Sundays race…

I have never seen a failure like this. No sign of rubbing or crimping. I replaced this brake line in September of last year and maybe 4 or 5 race weekends on it. Any thoughts?

#2

#3

Did the uncovered braided part come out of the connector at the end? Looks like a manufacturing defect to me. I’m assuming there was plenty of slack for wheel movement.

#4

Edit

#5

FWIW from an untrained eye, it looks like a manufacturing defect to me too.

That exact thing just happened to a 4th gen Camaro this past weekend at Thunderhill, and it resulted in a totaled car outside of turn 14. Scary. I can’t recall who manufactured the lines that were used in the Camaro.

  • Do you know the manufacturer of your lines?

I’m hoping it’s not Bimmerworld, as I just put a set of theirs on my car a week ago. They do look a bit different. Just more evidence for me to take care in choosing brake system parts.

#6

roman lifson had the same exact thing happen on his e36 at vir last year. ss braided hose failed at the caliper connection, looked like it was cut with a knife. i’ll ask what brand his were and update here.

#7

tell me those arn’t UUC!!

#8

Just by my observation through the pictures, it looks like the failure was due to improperly routed lines. Not enough slack, in the upper part of the line from the pic, and assume the caliper part was the same. SS lines are much more fragile than rubber lines, but SS lines do not expand. Sorry to hear about the failure, hope the car is ok.

Peter Thibault

#9

That hose looks like it’s custom made; length looks way too long for an OE-equivalent set of braideds.

The standard hoses just come off the hard-line, go down then up then into the caliper, nowhere near the strut. No need for that routing from my experience.

No problems with BimmerWorld or UUC lines out here as far as I know.

#10

The line was routed properly and had plently of slack. It’s the angle of the picture and my setup as I moved the line to get both ends in frame.

The line seperated at the attachment and I had never seen anything quite like it. With the point of seperation and the seperation being so straight it seemed ike a manufacturig defect to me as well but didn’t know if this was a common failure scenerio. Thanks for the thoughts.

The lines are Bimmerwold EVO. I will send it to them and see what they have to say

#11

I sent the brake line in to bimmerworld and got a call from Jay. They couldn’t see a reason for the failure and haven’t seen any problems with others. He did ask if I had left the caliper hanging from the brake line. I haven’t done so but did have the front bearing and hub replaced at a local shop…who knows. Nevertheless they are sending me a new complete set which should be here by Friday.

He also mentioned that the set they are sending would be of a newer design. He explained that the DOT specifications have recently changed and the rubber sleeve between the line and the attachment coupling has been replaced by a metal sleeve in the new design.