Master Cylinder Valve Question

[OrrieG]

Yes, disc pads rest right at the caliper and take little fluid to engage (that is why they have the smaller line and MC volume). Without the check valve the fluid bleed back and you have to pump to get the brakes to work again. Back drums are not as critical but still needed to keep fluid where it should be. Ogre got it, sound like they messed up the flare or used the wrong fitting, threads just press the flare to the inverted to seal.