Volvo RWD 900 Forum

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Irrratic Idle When Applying Brakes 900

posted by  tvpierce on  Sat Jan 25 02:46 CST 2003
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last visit: Tue Apr 8 06:40 CST 2014
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When I'm sitting at a stop light with my foot on the brake, my idle pulses rythmicly between 400 & 1200 RPM. If I reduce pressure on the brake pedal, the pulsing is reduced to about 600 - 1000. If I put the car in neutral, and remove my foot from the brake, the idle is fine.
I'm assuming this is vacuum related... any thoughts?

Thanks in advance.

Jeff Pierce
--
'92 Mercedes 190E (my daily driver), '93 945 Turbo (a kickass family car), '53 Willys-Overland Pickup (my snow-plow truck/conversation piece)








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Irrratic Idle When Applying Brakes 900

posted by  Brian S on  Sun Jan 26 11:08 CST 2003
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I'm glad you got an answer on this. I read your post last night, then had the same problem this morning! I'm not the superstitious type, but it was kinda creepy.

Is this happening all the time, or is it intermittent? I had it happen just once in 1 hour of city driving.

thanks, Brian








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Irrratic Idle When Applying Brakes 900

posted by  tvpierce on  Sun Jan 26 16:42 CST 2003
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last visit: Tue Apr 8 06:40 CST 2014
[RELATED]

I would call it intermittent, but it happens more than half the time.

Jeff Pierce
--
'92 Mercedes 190E (my daily driver), '93 945 Turbo (a kickass family car), '53 Willys-Overland Pickup (my snow-plow truck/conversation piece)








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Irrratic Idle When Applying Brakes 900

posted by  someone claiming to be steve on  Sat Jan 25 03:42 CST 2003 [RELATED]

Replace the small plastic vacuum check valve on the vacuum line leading to the brake booster.








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Irrratic Idle When Applying Brakes 900

posted by  Brian S on  Sun Jan 26 11:00 CST 2003
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This is the vacuum check valve, right?

thanks, Brian







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Irrratic Idle When Applying Brakes 900

posted by  C on  Sat Jan 25 05:44 CST 2003
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Is the brake booster the cylinder that the master cylinder attaches to?







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