Replacing booster in 40. I bought one from junk yard from 94 celica gt. only issue is the booster only has two bolts on front where it connects to master cylinder. Looks like I may just you mater cylinder as well. I got it for free as part of deal. The rear brake line appears to go through a splitter or some type of pressure reducer. Something similar is in my current master can you tell what it does? Is it needed?