"to check for air after,.. with m/c cap on,, have friend pump 2 or 3 times and hold down,,, remove the cap,, have pedal released as you watch fluid levels,... any "geyser" ( fluid spouting well above the surface) is compressed air, "springing" back,, front or rear,, -- -
For over 30 yrs. been checking that way, works in my shop..
