Personally I would replace mine as soon as there is any appreaciable sign of a lip on the outer edge.
 
Hi at what point should the front disc'be replaced i have 1.5 mm of wear so far thanks graham

The discs are 25mm thick. They should be replaced when they are at or approaching 18mm. Good discs will have a wear chamfer on the outer edge. When this disappears it's time to change them.
 
Last edited:

Similar threads