slack adjuster

My car broke down again, brake failure. To the 4S shop, where the repair staff told me that slack adjuster is bad, so will lead to brake failure. If the slack adjuster performance is not good, it is easy to cause accident. So the repair personnel told me frequently check slack adjuster, if found problems, timely replacement is good, this is not a big issue. I think it is, but if not repaired, may lead to unimaginable consequences. Before me there because the car slack adjuster is bad, not found, the high-speed road traffic accident, caused the deaths, now also goes to prison. So the ground must be checked slack adjuster parts, otherwise the consequences be unbearable to contemplate.