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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner past midnight.
When the brakes start applying from heat is it all 4 brakes or?
When the brakes start applying from heat if you loosen the bolts from the master to booster, does this release the calipers?
After driving and experiencing this issue do you have a temp gun to see the temp on the master and booster?
You can test it against something inside the house that is room temp.
At those temps I just do not see it able to apply the brakes from heat. I believe the focus needs to be on the pedal, something not allowing it to easily return to fully retracted like a worn bushing at the hinge area.
Prior to completing the mandatory rating at the top of your screen. Let me know if I have not yet provided you with ~5 STAR EXCELLENT~service. Reply and let me know in more detail what you need to be pleased with my help.
Sorry I do not have any diagrams in my repair guides of the pedal. I can opt out and let another try if you want.
Opting out now at your request