Quote:
Originally Posted by crwarren11
No. Air was not the problem initially. Everything felt completely different after the new booster. Air became a secondary problem that I could tell was an issue afterwards. The brake performance and power was excellent after the new booster. There was just no resistance felt in the peddle for the first inch. Which is what I consider a typical air in the system symptom.
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I have same sort of problem;
Like you, I have replaced the master cylinder with no improvement;
but it seems you were so unlucky that you replaced your booster and by coincidence the replacement booster was bad as well, and the fault was in same manner as your previous booster;
I'm reading of another X5 owner with the same problem, BMW just replaced his booster and the problem remains-
Hmmm... what should I try next?
The only possibilities left for me are:
1. Somehow there is still air in the lines (but it doesn't really feel like air, I get max braking once engages).
2. Pad knock back (causing increased pedal travel)
3. Non-return valve (or valves) faulty, and or hard vacuum lines.
4. Brake booster.
Your experience is making me think I should just bite the bullet and replace booster,
(I've got a 2nd hand one,
I'd have to wait ages for a new one to come to the land of Oz from overseas),
But I'm trying to nut out the problem and narrow it down before ripping out everything again,
Man I'm ripping my hair out!
