[urq] Brake - hard pedal when panic stopping

Maurits Jonkergouw urq at moregraphics.nl
Thu Jul 14 12:24:06 EDT 2005

Hi Steven, thanks. If the BMW bomb does not supply the correct pressure (=53 Bar). An incorrect specked bomb (more or less Bar) might prevent the valve from (fully) opening or closing. This could be diagnosed as a faulty valve block. What do you think?

If I drive 60 km\h and turn off the ignition and do a panic stop, I can easily stop the car (feel assistance) and able to lock the wheels with not much effort. Can I assume the bomb is depressurized after such event and of course if I don't start the engine again? 

Problem is I can't get me a rock hard pedal (with the bomb test) but I do have plenty power assistance when the engine is switched off while driving.

The latter tells me the bomb is pressurized and OK, the first tells me it's a) so good a bomb, it needs 70+ applications, or b) a sticking valve block prevents depressurizing the bomb. In both cases a) and b) this tells me the bomb is pressured and dangerous to remove.

(Sorry Ben I hijacked your thread)


1986 GV (Swiss WR)
1985 CGT KV
1982 GL DD

  I suspect that the valve that fills the bomb is not opening, and that is why there
  is a hard pedal from the start.  The system depends on that pressure
  built up in the bomb.

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