I think the OP's friend has embarrassed themselves by placing the phone call. I can't think of anytime I haven't given my brakes a quick squeeze between getting it out of the shed, and setting off (it would not be the first time I've found something has changed with the bike eg got knocked in the shed). Taking a bike of a turbo should lead to a checking over of all functionality gears, brakes, wheels secure/spinning freely etc. The conversation smacks of entitlement however the sentiment was expressed. You (presumably) didn't charge them, no contract implied, guarantee etc. Said friend would not get another (free or otherwise) service again.