Subaru LEGACY 2002 Quick Reference Index page 429

A: OPERATION
1) Operation before the split point
The piston is held pressed toward the left by the spring so that the valve is kept away from its seat.
Under this condition, fluid pressure "P
from the master cylinder.
(1) To rear wheel cylinder
(2) From master cylinder
(3) Seat
PROPORTIONING VALVE
" to the rear wheel cylinders is equal to fluid pressure "P
3
BR-9
(4) Spring
(5) Piston
(6) Valve
Brakes
"
2
H4H1398B