i'm in the middle of collecting all the parts to fit a handbrake to my drz 400 i've got a brembo clutch master cylinder and a braided line and all the fixings which i got as a kit off ebay. Do i just put double banjo bolt into top of original rear master cylinder with the original brake line and the new handbrake line or will i need a oneway valve??? just don't wanna mess up. greatful of any help thanks