Issue link: https://read.dmtmag.com/i/34500
Bead damage as a result of brake heat is recognizable in 3 stages of severity. In the first stage, the bead starts to turn inward. This can be visibly identified on the tire when it is dismounted. A straight edge placed across the beads from one bead to the other no longer rests on the bead point, but now rests closer to the bead bearing area. The third stage is when the casing ply fully unwraps from the bead. In extreme cases, the casing ply unwraps from the bead all the way around the tire. At this point the tire completely separates from the bead wire. The bead wire can entangle itself around the axle if this type of separation occurs. 3rd Stage – Partial Unwrapping of the Casing Ply 1st Stage – Turning of the Bead The second stage occurs when the rubber in the bead area starts to split or crack indicating that the steel casing plies are starting to unwrap. 3rd Stage – Complete Unwrapping of the Casing Ply 2nd Stage – Bead Splitting from Heat Operation and Handling 65