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C250 revs drop when brake pressed ??
Hi, I have a '96 C250 turbo diesel auto estate.
When the engine is revving, when I touch the footbrake the revs drop - is this normal? Does anyone have a similar vehicle they can try it on please? It happens when driving or parked, the engine slows eveytime the brake pedal is pressed & then revs back to normal when the brake pedal is released. cheers Chris |
#2
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It sounds to me like the separation between the vacuum going to the brake power booster and something on the engine is being breached. Perhaps something as simple as a one way valve not working properly in the vacuum lines.
I have no books on cars so new as yours....so this is just a guess....
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#3
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Thanks, I suspect it may be vacuum related - but knowing Mercedes I would just like to make sure it isn't some sort of economy feature
I would just like to know if anyone else has the same thing happen on their car before I start pulling pipes off! cheers Chris |
#4
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Good plan... and your impression/wariness of Mercedes design is certainly warranted...
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
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