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Old 08-02-2011, 01:11 PM   #1 (permalink)
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Default Brake Booster check valve

I had a question about the brake booster check valve. When I come to a stop and press on the brake (or even just idling and press the brake), the rpms drop really low like around 400rpm and then bounce back up to around 1200-1500 (I guess it's the ECU trying to move the idle speed back up). My question is does the brake booster have any effect, or should it, on the rpms of the engine. I took the check valve out and the engine doesn't drop as low and pressing the brake doesn't have any affect on the idle speed. Could the check valve be leaking or is it just something that is suppose to happen? I tried it with and without the IACV hooked up and it does the same thing so I know it's not related to that.
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Old 08-02-2011, 02:26 PM   #2 (permalink)
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Id put that check valve back in. You can suck/blow on the check valve to see if its bad. Or even turn off the car and pump the brakes they should get hard.
Now the break booster does play a small part in rpm. If the car is on and you pump the breaks the rpm will go up. I believe its because your throwing off the amount of air in the intake manifold.

But your basic problem is when coming to a stop and pressing the breaks the idle drops low then shots up and then level out?
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Old 08-02-2011, 03:09 PM   #3 (permalink)
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Originally Posted by xile6 View Post
Id put that check valve back in. You can suck/blow on the check valve to see if its bad. Or even turn off the car and pump the brakes they should get hard.
Now the break booster does play a small part in rpm. If the car is on and you pump the breaks the rpm will go up. I believe its because your throwing off the amount of air in the intake manifold.

But your basic problem is when coming to a stop and pressing the breaks the idle drops low then shots up and then level out?
Yeah, I wouldn't ever take it out and drive it. I tried suck/blow trick on it and seems to be fine, but do you think it might leak under higher vacuum levels? ^That is my question, the idle drops low, shots back up, then eventually levels out. Everyother car I had it would just drop down to idle level, but never any lower.
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Old 08-02-2011, 04:48 PM   #4 (permalink)
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Yeah, I wouldn't ever take it out and drive it. I tried suck/blow trick on it and seems to be fine, but do you think it might leak under higher vacuum levels? ^That is my question, the idle drops low, shots back up, then eventually levels out. Everyother car I had it would just drop down to idle level, but never any lower.
Where your other cars hondas? All hondas i had, have that sucky idle problems. 850rpm then drop down to like 500-600 for no reason.

But it could be a leak in the break booster causing air to come in and throwing off the mix. That would explain the high idle, because it would be a vacuum leak. The low idle im not sure could just be the ecu making adjustments to the high idle.

Id check the booster for leaks, then the hoses. Also does the car stop ok or brakes kinda feel funny?
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Old 08-02-2011, 06:41 PM   #5 (permalink)
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most likely the diaphram inside the booster is ripped.

after letting your car idle shut it off and be absolutely silent while laying in the floorboard and slowly push the brake pedal, if you hear a hissing noise then its bad.

the check valve isnt really needed in a N/A car, its more of a safety feature.
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Old 08-03-2011, 08:17 AM   #6 (permalink)
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Yeah, I've had about 15 honda's, surprisingly most idled perfectly fine it's just my own personal car that gives me the headaches. I did notice a hissing sound, but didn't know that was the diaphram. All the hoses are new and I checked and there is no leaks. I'm kind of annoyed about these power brakes, maybe a manual brake swap? I mean my crx doesn't have anything else power, so why should my brakes,lol.
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