Thanks for the reply. I have already replaced both hoses and calipers, and
bled the front lines. I didn't check how hot the MC was before I did all this.
I'm going to assume (hope) the heat level is normal.
I've never taken a car for a drive and touched the master cylinder
afterwards. I've also never touched the brake rotors, or the tailpipe after
a drive.(strange how some people do)
Brake fluid has a boiling point, so I suppose the master cylinder is going
to get warm.
Regular DOT3 fluid boils at about 500F
Water contamination of the brake fluid can lower the boiling point
significantly. DOT 3&4 fluid absorbs water from the air.
I would imagine the master cylinder isn't 500F when you touch it, so I
wouldn't worry too much.
If you haven't changed the brake fluid in that car in 5 years or more, maybe
it's time to bleed out all the old fluid and fill 'er up with fresh stuff.
It won't stop the master cylinder from getting warm, but it will get rid of
any contamination in the fluid.
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