Since I've never replaced a master cylinder (until now), If I replace the old one, do I need to replace the vacuum booster as well?

 

I 've never had to replace a booster . I've replaced many master cylinders . unless of coarse you have reason to believe it may be bad . not sure how to check it. if the master is just leaking then a simple replace . use flair nut wrenches to avoid slipping of a common open end wrench . and / or the old brake fluid may be so contaminated that it plugged the line/s . you also have to bleed the new cylinder . good luck let me know how u fare .

 

Thanks. The booster is working fine. I'm looking at the original master cylinder and the fluid in it and the brake lines is beyond contaminated.

 

if you can get break fluid with pressure at the wheel when bleeding then the lines are o-k . you might try to replace the fluid that way ;bleeding till you get clearer fluid . **just don't let the master get low . **

 

Hey, do you have any instructions at all? Detailed instructions please! Thanks!

 

Instructions for what? Bleeding?? Or priming the master?