Many seals fail because the MC Bore(s) are bad and eat the seals.
Fiero MC is quick take-up design...
QT valve is not available in a "rebuild" kit.
"Honing" aluminum MC is very hard for DIY jobs.
See my Cave, Brake Service
and Quick Take-up notes
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)