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RPM goes down after brake pedal let go 700

posted by  robhub27 on  Sun Jun 22 16:45 CST 2008
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last visit: Wed Jul 11 08:12 CST 2012
[RELATED]

Hi everybody
Yesterday I put new Brembo front discs, new pads and rebuild right caliper (jumbo brakes (one piston caliper), ABS, 740 '91 turbo, AT), bled the system with self-made power bleeder and new Volvo DOT 4+ ( this is not the first time job for me) and here is the problem: when the engine idle and I press the pedal everything looks OK, but when I let the pedal go the car almost stalls, the RPM goes below 500. Can anybody tell me what is going on here?
Thanks in advance!

--
'91 740 turbo SW, '92 940 turbo (PL)








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RPM goes down after brake pedal let go 700

posted by  Erling on  Sun Jun 22 19:31 CST 2008
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last visit: Wed May 22 00:57 CST 2013
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I'd say it is brake booster related. I'd first check the easy accessible parts; the white plastic valve and the vacuum hose. If these are okay I'd move on to the booster itself.

Erling.
--
My 240 Page








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RPM goes down after brake pedal let go 700

posted by  robhub27 on  Mon Jun 23 15:31 CST 2008
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last visit: Wed Jul 11 08:12 CST 2012
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Didn't do anything since last post, and everything look OK now. Is there a ghost in the machine?
--
'91 740 turbo SW, '92 940 turbo (PL)







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