yes if you don't have the lid on the brake fluid reservoir and you pump the brake, it will squirt when you release the pedal. so always pump slowly and put some cloths around your MBC. Also when bleeding the brake never, ever and I mean never, ever, fully compress you brake pedal. even if you have rebuild the MBC, there is a very good chance you damage the cups in the mbc and you're back to square one.
that could be the reason, why your pedal goes down to the floor when driving. I assume you have power brakes? so the extra vacuum pull with the engine running will give you the "strength" to push through the remaining resistance in the MBC.
on second hand.. have you also bled your MBC when installing it, or only ate the brakes?

Last edited by Steve-W; 07/11/2019 10:47 PM.