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Drum brakes use a residual pressure valve (RPV) that maintains 7-10-psi line-pressure to compensate for return spring tension. In-line ones like this are available from the aftermarket. In a stock M/C the RPV is located behind the outlet port’s flare-seat. If a drum-brake M/C has enough fluid capacity, it can be used with disc brakes by removing the RPV. View Related Article
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