The pump flow control canister and plunger valve wear, allowing the plunger valve to stick open and/or leakage to occur. The canister o-ring relaxes and pressure bleeds past it.
This drop-in-place assembly includes a harder canister with more support for the plunger valve, which prevents sticking. The assembly also includes a case-hardened plunger valve with self-centering annular groves, a replacement spring, and larger O-ring for improved sealing.
The OE flow control valve is designed to increase pump efficiency by rerouting excess line pressure back to the suction side of the pump. It is common for the plunger valve to become stuck open, or for the canister to wear. This decreases line pressures and results in delayed engagements. The Sonnax pump flow control valve assembly eliminates the sticking and wear problems with redesigned and precisely machined parts.
Product supersedes 56200-02K
Contact a Sonnax Parts Distributor.