Strange brake issue - hard pedal

[frodiesel]

Could still have moisture in the NEW check valve. Take it out, warm it up, and spray wd40 in both sides, dry and reinstall.

Or you have a fluid leak

Or you have a bad booster

Id put the old check valve back in if you have it just to see.

 

[SpidermanGeek]

Did they change the check valve grommet too?

 

[ølaf]

@ Renton4runner

Curious if you ever got this resolved?