1. Look the same Perform quite differently The knock off valve s wall is 56 thinner making it more susceptible to cracking or m E A Er 1 3 i sf is even a complete valve rupture m Inconsistent spring tension on the knock off can result in brake imbalance and longer stopping distances Look for the genuine Bendix name and logo on the box to ensure you are getting a genuine part O rings seals bolts and pistons all built with inferior materials can lead to accelerated wear and leakage Genuine Bendix valve Knock off valve Bend w