Factory Five Racing MK4 ROADSTER Assembly Manual page 192

If drilling a hole for the reservoir hose, drill a ⅝" hole one inch down from the bottom of the reservoir. Take
extra time with a file and round all the edges making sure there are no burrs left or sharp spots.
Route the fluid line for the master cylinders through the hole and press onto the bottom of the reservoir.
Route the line from the reservoir the top of the brake pedal area then cut the hose.
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