There is nothing that would cause this that is temp related, if the pedal sinks to the floor you may have a by passing master cylinder, this can happen with light brake pressure with heavy pressure the seals in the master cyl will seal against the bore with more efficiency, if you had air in the system, the pedal would not recover, I would be checking the master first.
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Wednesday, July 29th, 2015 AT 3:27 AM