Caliper bolts

[OptimusPrime]

Would anyone know the thread pitch on a GM caliper bolt, got the brackets made but can't seem to find the right pitch tap. I know its probably metric.

 

[GT63]

Would anyone know the thread pitch on a GM caliper bolt, got the brackets made but can't seem to find the right pitch tap. I know its probably metric.

It's either 7/16-20 or 10mm 1.5 pitch

 

[RPM]

It is 7/16-20