Brake vacuum leak

[BigRedLancer]

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.

[BigRedLancer]

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.

[Canuck]

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.
Canuck