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Subject RPM's drop when pressing the brakes (not common)
     
Posted by joe645733 on May 04, 2012 at 7:41 PM
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Message Hello all. alright, i'm going to try and shorten this up a bit.

-One day, my brake pedal hit the floor while driving. i bought a BMC, replaced it myself and brought it to a shop to have the fluid flushed, (i'm not too good with brakes so i figured i'd rather have a professional do it). NOTE: i did NOT bench bleed the new BMC, i forgot to.
So at the shop, the tech went ahead and changed the brake fluid anyways. he had to open the bleeders a few times to regain pressure back on the pedal.

after he was finished, my brakes worked. they only worked for about 3 days before i noticed my car would rock from side to side when braking, (only the driver's side front caliper was working). a couple days after that, my brake pedal again went to the floor, therefore, i have 0 brakes now besides the hand brake.

okay , here's the wierd thing now:
i noticed when i'm at idle, when i push my brake to the floor quickly back and forth, my idle begins to drop. i also notice my aftermarket boost gauge begin to head to the positive pressure side. my car nearly dies if i continue pushing the pedal.
i checked my vacuum hose from the plenum, leading to the brake booster. noticed a slight crack in it, so i replaced it. this did NOT fix the issue, though...

i'm stuck and i don't know what to check next. i'm beginning to think that even if i redue my brakes the corect way with bench bleeding, my brakes will go back shortly after because i think there's air escaping somewhere everytime i press the brake pedal...

THANK YOU. i haven't been checking into it much before this, but i haven't had a full working set of brakes in a month.

     
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