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Used for brakes on competition cars too. Endurance race cars tend to have dry-break couplings in the brake lines so that if the team has to replace a corner of the car (i.e. suspension, upright, hub and brakes) they can just remove the old one, attach the new one which is already pre-bled, and off you go. Saves having to remove the caliper before switching out the suspension and then refit it once the new suspension's in place.
Audi definitely used them on a lot of fluid lines when they had their incrediballs system for replacing the whole of the back end of the car in a few minutes at Le Mans.
Brommers
I suspect these are hydraulic clutch line dry-breaks.