The Push rod of the master cylinder for automotive use is activated
by generate hydraulic pressure and actuate the brake.
The brakes fluid is required (DOT3, DOT4 or above) in automobiles.
If a new master cylinder is used, be sure to remove the check valve to
eliminate remaining pressure.

Size / BST 2 / BST 4
Sizes of cylinders / 2” / 4”
Pressure boost ratio / 7 / 14
Fluid delivery / 9 cc / 12 cc
Weight / 1.6 kg / 2.5 kg