[QUOTE="steve"] An unscientific test (apart from taking a run down the road and giving it some) is to get a small graduated beaker, or even a syringe tube, and find out what each master cylinder delivers for a given movement of the handlebar lever. Then take 'em apart and compare master cylinder piston areas. Do you know the piston area of a Suzi master cylinder compared to a BM one? That gives the ratio of pressure increase. Pumped volume comes into it as well. What is the volume of fluid needed to move the Suzi pistons a given distance compared to the BM ones? If you move one caliper piston 1mm then for 8 pistons you need effectively 8 mm of movement and the volume of fluid to achieve that. A bit late at night for hydraulics but I reckon (assuming 0.5 mm of movement max but possibly half that) the Suzuki needs 4 times as much fluid to move it's pistons compared to the BM.[/QUOTE] How do you calculate the 4 times? Given that the surface area of the pistons is near as dammit the same surely that means to move by 0.5mm you'll need near as dammit the same amount of fluid?