I would not recommend reuse.
The reason they snap in two is because they are hardened. You should replace them everytime, as you risk 'damaging' them from impact. Naked eye not good enough to detect signs of internal damage to pins.
Is it really worth reusing pins that cost £29? Think of the increased risk of failure, and the consequences of failure, vs the cost to remove the risk.
Madness.
calipers not held on with stretch bolts as far as i know
Dont know about stretch bolts but i know that renault documentation will state nearly all the time that bolts must be replaced if removed especially bolts that are under pressure or holding important stuff like brakes or steering racks.....
Which is fine when there been replaced under warranty(cause they can be stupid money) but most arent replaced outside of warranty and they last for years or never give trouble....
Also brake pad sets from renault usually contain clips shims etc if renault think there important enough to be replaced each time
mine were seized and had to be replaced, so bad they damaged the caliper a little, doesnt look new anymore...... it is no problem if you change pads every 6-12 months, but mine has covered 40000 miles on the OEM set of pads!!!!.... so that means 3 years without anyone touching the brakes.....
@Foxspeed what size pin punches did you use please?