Well, u left your handbrake partially on w/o knowing it,
& sped long distances for about 110km/h.
In this case, i can conclude u don't only overheated your brake-pads,
u also almost overheated your engine w/o knowing.
Travelling 110km/h wif h-brakes on, is equivalent to travelling
around 130km/h & above wif brakes off
Engine was producing speed of over 130kmh when e car is only
travelling at 110kmh. This could hav caused overheating of engine.
Also your brake-pads would hav already been worn out during tat time.
Pls go change em. Is dangerous drivin wif worn-out brake-pads.
I'm also afraid some parts of your engine may hav worn-out due
to e diff in engine speed & actual travelling speed,
so if possible, do an engine checkup for signs of over-abrasion & over-heating.
Happy driving!
