Quote:
Originally Posted by c4koh
I understand, however why would my pedal sometimes be very firm? I don't want to simply replace the master cylinder only for it to be something else, or indeed simply air in the system (in general).
If the pedal were consistently spongy / lots of travel, and I'd done a full bleed, and still got back to a consistently spongy feel - yes, I'd go with the MC. But as the pedal is sometimes hard, I wonder if it is something else.
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Did you look at the thread link?
You should do the MC test and see what results you get.
This will determine if you need a new MC or not.
You may want to do all 4 lines bleed down for air bubble purge first and see.
If the spongy comes back then really all that is left is the MC to check into.