If you have hydraulic disc brakes and they're at the very upper end of how full they should be then heat can be a concern - Tarty Bikes say not to leave your bike in the car on a hot day if you've slightly over-filled the system, for example.
@Dammit started
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If you have hydraulic disc brakes and they're at the very upper end of how full they should be then heat can be a concern - Tarty Bikes say not to leave your bike in the car on a hot day if you've slightly over-filled the system, for example.