1999 mercury cougar v6 5 speed
Discussion Starter · #1 ·
So I'm going to be tearing out the old vaccum lines and replace them with new silicon ones. But the top hoses are different sizes. I was wondering if I can make them both 3/8 I.d. hoses even though thr brake booster hose looks to be 7/16 I.d.? I don't want the brakes to be harder to push if I do downsize on thr diameter of the hose. I just want to make sure making them the same sizes that thr car will operate like it should.