you probably need to replace the line itself. Each wheel has it's own line from the master cylinder on that year. The things to consider is wether or not the system was drianed when you drove it. If the master cylinder ran dry, you'll need to rebleed all of the lines for safe measure instead of just the left rear. Also, if that car has ABS ( antilock brakes) you'll also have to purge the air out of that as well.