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Old 10-11-2009, 12:46 PM   #1
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Location: San Jose, CA
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Brake vacuum leak

After a 3.5 hour drive, we stopped to unhitch the toad and found the car batter was dead. After a jump start, the battery was OK. Turns out there is a leak in the vacuum system that caused the SMI brake to cycle every couple of minutes for the 3.5 hours. This was too much for the 5 year old battery. Now I need to find out where the leak is. I really don't want to drive without the brake. The battery had a 84 month warranty but got a new one anyway.

2005 Winnebago Sightseer 30B, F53 Chassis
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Old 10-11-2009, 06:18 PM   #2
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Checked out the vacuum lines and found the quick disconnect on the SMI brake was falling off. The connector was loose when fully connected. After playing with it, I was finally got the connector tight enough to reduce the leak enough to hopefully not kill the car battery again. Will call SMI to see if they have a better connector.

2005 Winnebago Sightseer 30B, F53 Chassis
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Old 01-17-2010, 11:42 PM   #3
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I had a similar dead battery problem caused by the on-off cycling of the SMI Plug 'n Play. My problem turned out to be a vacuum leak in the short piece of hose connecting the one-way check valve to the T-connector. Swapped out the hose and the system was vacuum tight.
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