1. How is your back brake?
2. If you suspect flexible hose, lightly sqeeze the rear brake hose, and depress the brake pedal. Sense the radial expansion (or measure it with a caliper by comparing the OD with the brake off vs. with the brake on). Then, do the same with the front brake line, and compare the two. if the front hose expands more, you might have weak brake hose.
3. If you're creative, you can build yourself a pressure sensor by getting a banjo bolt, a crush washer stack, and a schrader valve, and a tire pressure gage (cheap). drill/tap the banjo bolt for a schrader valve, use your washer stack to deadhead the banjo (stack washers to block fluid from escaping), and measure the pressure you can generate with the M/C. You can also compare this to a buddy's bike, or your rear brake.
If your pressure is low, then you might have a bad MC (if the cylinder walls are scored or pitted, fluid will leak past, resulting in low pressure).
Nothing beats a measurement.
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