I had my vacuum wiper motor rebuilt. The truck is a 59 Chevy. This rebuilt motor is beautiful and works great on the bench. I checked if it seals vacuum in the 'off' position, and was surprised that it does not. Using my hand vacuum pump a quick squeeze pulls 15 inches of vacuum but it bleeds down to zero within a few seconds. It seems like excessive leakage to me. Is it normal for these to leak vacuum when in the off position, wipers parked?
Mark
