Master Cylinder Geyser

[Haskie83]

Hey guys, doing a master cylinder on my father in laws 1992 C1500, 305. Got an ac delco one from rockauto, PN:18M1746. Old one was leaking @ the joint between the plastic reservoir & the master cylinder itself. A few years ago doing brakes he hit the pedal while I had the cap off the reservoir and it shot like a fountain everywhere, was hoping this new cylinder would NOT have that issue, but while bench bleeding it, looks like it’s already pushing pressure to the reservoir too. What’s the deal? Are they all like this or did I break this one already?

 

[fast 99]

They will squirt fluid up until the cup inside the cylinder gets past the open ports, normal. They will all do that to some extent. Fill it up and set the cover on it [don't clip on need to let air in]. What I usually do is open the LF bleeder and watch for fluid. Then proceed with normal bleeding.

 

[Haskie83]

Ok thanks, so they’re all like this, good to know! Yup bleeding went as normal.
Thanks!!

 

[rusted nuts]

Ok thanks, so they’re all like this, good to know! Yup bleeding went as normal.
Thanks!!

Yep normal...