Guest tony78_280z Posted October 24, 2004 Share Posted October 24, 2004 I've got the original Z Brake master, and it's always needed a bit of fluid every once in awhile. The Z has sat for some months while I did this swap, and of course it was nearly dry when I took it for it's test drive. I added some fluid, thinking nothing of it but the brakes don't work right. The peddle goes to the floor before the brakes grab. It does have brake fluid in the master now so I know it's not just leaking out. So I know the master probably needs to be replaced eventualy. But I've been driving it like this for nearly 3 years and this is the first time that simply adding fluid hasn't helped. I'm wondering if the Carbed V8 has less vacuumm and therefore the servo doesn't have the power needed. Other than that the brakes probably just need to be bled. But I'm rather curoius about the vacuum level. Quote Link to comment Share on other sites More sharing options...
Datsun660z Posted October 26, 2004 Share Posted October 26, 2004 Bummer I was HOPEING to see a reply to this. I have the same problem. My brakes worked perfectly fine before installing the 400 in my 76 Z. But now when I stop, peddle goes to floor then brakes engage. This is the second new master cylinder so I must be doing something wrong. Quote Link to comment Share on other sites More sharing options...
80LS1T Posted October 26, 2004 Share Posted October 26, 2004 Do either of you guys have a vaccum gauge? If so check to see what kind of vaccum your engine is producing. Chances are if you have a large cam you wont have very much vaccum. If you engine is stock however it should supply more than enough vaccum to that brake booster to aid in braking. A stock engine is usually around 20" of vaccum just for referrence. However, your(tony) problem seems more like a leaking master cylinder. Not externally leaking but internally leaking past the cups in the MC. Also if the fluid is not leaking out then where is it going? Do you still have the stock rear drums? Make sure the wheel cyclinders arent leaking. That would also cause a low pedal and would explain for the loss of fluid. Make sure to also bleed out he MC, then bleed out the braks starting at the furthest away form the MC and work your way up to the closest. Guy Quote Link to comment Share on other sites More sharing options...
Datsun660z Posted October 26, 2004 Share Posted October 26, 2004 Humm, I will check the vaccum level. But the peddle is easy to push down with the engine running, but hard to push with the engine off. sounds like the boster is working. What do you think? Quote Link to comment Share on other sites More sharing options...
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