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Old 08-10-2014   #4
WB9MCW
 
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Join Date: Dec 2003
Location: McHenry, Il.
Posts: 6,584
Default Re: Intermittent brake feel - sometimes firm, sometimes feels very soft

Quote:
Originally Posted by c4koh View Post
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.

?
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.
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