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I am giong to try doing a seafoam for the first time in 03 civic with 45k miles. I need to know where the brake booster hose is on 03 civic ? plese provide pic if you can. very much appreciated. Thank you

 
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the brake master cylinder is on the drivers side firewall. There is the largest resorvoir in that area, and its attached to the firewall. Probably has a darker colored fluid in there. (mine may need a flush). It connects to the brake pedal in the car. So right where the rod goes through the firewall, is where the master cylinder is. I would follow the lines to find the brake booster. Good luck, hope this helps! Ive never messed with my brakes, so I couldnt tell ya. Sorry.

 
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I wouldnt even do seafoam. i did it and a few days later i got a 02 sensor code

 
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I've heard similar stories from others.

I've never tried it because I never heard anything good about it.

 
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What Happens Is, The Carbon Build Up Shoots Out Of The Exhaust And Messes Up The O2 Sensor (i Was Told)

 
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It's got 45,000, do a valve adjustment, brake fruid and anti freeze.