Question about 2008 Nissan Sentra

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The engine rpm drops and brake pedal hard and no break what to do?

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Take it right back to the dealer and raise hell, the car is practically new. Certainly way too new to expect this sort of issue. If you get no joy from the dealer contact Nissan directly. There is manufacturers code of conduct to provide customers with three years of warranty. The chances are that the vacuum tube from the inlet plenum has become detached or split and this is compromising the brake assist servo function.

Posted on Oct 06, 2010

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It sounds like a vacuum leak in your power brake booster

Posted on Oct 06, 2010

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4 Answers

Why is it hard to push on the brakes


The most obvious cause for a hard pedal is simply not enough vacuum. Check the brake power booster by pumping on the brake pedal while the car isn't running. Continue pumping until you've "bled off" the vacuum from the booster. Hold the pedal down while you start the car. The pedal should go down a bit more beneath your foot. If it doesn't, then you should examine the connection between the vacuum hose of the brake power and the engine's vacuum.
Replace the brake power booster if the connection's fine, which would fix the hard brake pedal problem.

It may be your calipers need replaced. Check them for signs of wear. Look at the metal spring where the brake pads sit.
Apply tension to the pad and see whether you hear a pop. If you do, the brake pad is moving too much on the bracket. Replace the caliper. This could help the hard brake pedal.

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no I don't think so , it is only the torque converter clutch engaging and disengaging due to engine load. if you want to test this. go on steady speed over 50 mph no gas pedal movement. touch lightly the brake pedal but not braking and release . during this see the rpm drop down and raise

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Year make and model ? Do you have vac to the power brake booster ? ?

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2000 mercury cougar engine speed stays up when gas pedal is release, increase when pedal is release and shifting gears, takes 3 seconds or more to come down to idle when gas pedal is release, will hold at...


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What is the sympton for bad break booster.i am confused--will the brake pedal be hard to push down or way to easy to push to floor. i have hissing sound in warm weather near brake pedal but not in cold...


Hello rickyjkoch: My name is Roger and I will help with your question. With the engine off, press the brake pedal down several times. Hold the pedal down and start the engine. The brake pedal should drop 1 1/2 to 2 1/2 inches toward the floor. If the pedal stays up and does not drop the booster has a problem. However if you hear a hissing sound from the dash area of the brake pedal the booster should be replaced. Should you need further help please just ask. Please rate the answer. Thank You for using Fix Ya. Roger

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While sitting at lights even pressure on brake pedal. brake pedal sinks to floor . engine revs drop to 600 rpm's . when brake pedal is released engine rev's increase to 900 rpm's? Dealer mechanics say it...


not normal at all,a couple of causes 1 small valve at the front of the servo unit,2busted pipe coming from the servo unit,3the servo unit itself needs replaced.so where is the servo unit?.if you lift the hood you will see in front of the brake pedal only inside the engine compartment look closely and try to judge it ,its about the size of a bottom of a small sauspan only about 4/5 times the thicknes,thats your servo and that where your problem is.adrian,,,

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1 Answer

Have to press hard on breaks to break on 528i bmw 2000


sounds like brake booster not working
check vacuum hose that goes to booster is ok and not leaking
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pump up brake pedal several times
hold brake pedal down
start engine
pedal should sink down approx half to 3/4 way down indicating booster is working
if pedal doesnt go down when engine is running booster has leak or no vacuum supply from engine which requires great pedal effort to try and get vehicle to stop.

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Check the drive belts under the hood. It should be be present and not loose.
Check the brake fluid level in the reservoir.
If no problems found, see a mechanics. Safety issue.

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