Dump Valve

Disconnect dump valve vacuum hose at servo. Connect hand vacuum pump to hose, and apply 18 in. Hg vacuum. If vacuum does not hold, replace or adjust vacuum dump valve. Replace vacuum hoses as necessary. If vacuum holds, press brake pedal with vacuum applied to dump valve. If vacuum releases, dump valve is okay. If vacuum does not release, adjust or replace dump valve. See VACUUM DUMP VALVE under ADJUSTMENTS.