Your home equity line of credit may no longer be the safety net you've grown accustomed to, whether you use it for large-scale home renovations or as an emergency fund when unexpected expenses pop up.Lenders are putting on the brakes - cutting off existing home equity lines of credit and limiting new lines. The Wall Street Journal reports major lenders, including Bank of America, Citibank, Countrywide Financial, Washington Mutual Bank, and USAA, have informed hundreds of thousands of customers that their lines of credit have been frozen this year.