I just bought a 94 civic with an ls swap in it the car runs excellent and I have brakes when driving normally but when ever I pull in my driveway and turn the wheels sharp to park I lose brake pressure at first I thought it was a leak and I was losing brake fluid but I jacked the car up and checked all the brake lines and there aren't any holes or leaks I even bleed the entire brake system hoping it was air in the lines and still no go as long as the front tires are turned all the way in either direction there aren't any brakes at all pedal goes to the floor but if you turn the wheel back straight brake pressure will return

 

please help me out everyone im stumped don't know what to do next

 

Lug nuts tight? Wheel bearings good? If the rotor was able to move it could be pushing the caliper piston in when turning.

 

yea the lug nuts are tight and the wheel bearings are good it seriously feels like air in the lines because the pedal has no pressure on it but I bleed the entire brake system front and rear yesterday with a vacuum bleeder and still nothing since it only happens when the wheel is turned fully I looked for pinched lines and dry rotted or cracked hoses but I couldn't find any leaks anywhere and then I checked under the dash to see if something may have been binding since the steering column runs directly beside the brake pedal and couldn't find any signs of the steering column rubbing anything I know if it was the vacuum booster the pedal would be hard instead of soft is there any possibility it could be the master cylinder or a bad seal on one of the calipers that is sucking air when the tire is turned

 

well I figured I would give everyone an update I managed to figure out what the problem was and it turned out to be a simple fix the guy who had the car before me puts some aftermarket coilovers on it and when he installed them he put the bottom mounting bracket on backwards so when ever you turn the wheel sharp the caliper would hit the bracket and slide the caliper over into the rotor and pushing the piston all the way in and whenever you hit the brake pedal the caliper would have to straighten itself back out before it could grab making it feel as if it had no pressure