Trooper II L4-2559cc 2.6L SOHC (4ZE1) (1989)
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Brake Proportioning/Combination Valve: Description and Operation
These valve(s) which are threaded into the master cylinder (standard brake system), limit outlet pressure to the rear brakes after a predetermined
master cylinder pressure has been reached. This is used when less rear apply force is needed to obtain optimum braking.