I changed the spark plugs on my 2003 Grand Caravan 3.3 and now the brakes are not working properly. They are hard to push down and don't stop the vehicle very well. I think I may have knocked a vacuum hose off but I can't see any thing wrong. Any suggestions?

 

Welcome to DF
Check all your hose's at the brake booster. Look at the check valve for any caps missing.

 

I found a vacuum hose that had come off and every thing works fine now. Thanks