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Hi all, My 2002 sedona is just one problem after another, The problem now is when I press brake pedal the engine drops about 200 revs and when I release pedal it runs normal, I have checked all vacuam pipes but see nothing wrong, I need help advice please,
 

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MININUT said:
there's a switch on the brake pedal, disconnect one wire and try again (remember to replace the wire). If it's still the same re-check your servo!
-I would have thought it was the servo - difficult to check without specialist equipment as they are a sealed unit - I once had a Vauxhall Astra that had the same symptons replaced the servo and it cured it. Out of curiosity I cut the old one open - theres not much inside them, a spring and a large rubber diaphragm - and that had a 2" split in it. I would check the hose connections from the engine to the servo and also the hose itself which may have perished inside.
 

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alcutler said:
MININUT said:
there's a switch on the brake pedal, disconnect one wire and try again (remember to replace the wire). If it's still the same re-check your servo!
-I would have thought it was the servo - difficult to check without specialist equipment as they are a sealed unit - I once had a Vauxhall Astra that had the same symptons replaced the servo and it cured it. Out of curiosity I cut the old one open - theres not much inside them, a spring and a large rubber diaphragm - and that had a 2" split in it. I would check the hose connections from the engine to the servo and also the hose itself which may have perished inside.


Yes precisely, it's quite often noticeable when you stick your ear as close as possible to the brake pushrod, OR hold a length of tube to your ear and the other end towards the pushrod entry.
Another test is to pump the brake pedal to exhaust any vacuum, then while still depressing the pedal start the engine, the pedal should travel down quite considerably about 2" off the floor (depends on condition of your brake system)
 
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