04-01-13, 08:04 PM
Reason for that crack is simple looking at the corrosion on the discs and fork legs.
The rivets/bobbins which allow the disc to float have seized from the buildup of corrosion.When they seize the disc cannot move as it should when it expands/contracts and its only option to allow its movent is to crack at the weakest point, which it has.
The pictures also show the disc bolts have been replaced with standard bolts and washers.
When you replace the 2 discs, replace the bolts with the proper ones and overhall the calipers at the same time. With that level of corrosion it is possile the capipers are close to seizing point.
The rivets/bobbins which allow the disc to float have seized from the buildup of corrosion.When they seize the disc cannot move as it should when it expands/contracts and its only option to allow its movent is to crack at the weakest point, which it has.
The pictures also show the disc bolts have been replaced with standard bolts and washers.
When you replace the 2 discs, replace the bolts with the proper ones and overhall the calipers at the same time. With that level of corrosion it is possile the capipers are close to seizing point.