Question about Nissan Z

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Brakes pedal gets hard sometimes while driving and then it would come back soft and nice.This is on a nissan sunny 2005 car. Kindly explain. Thank you

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  • pakeerah Apr 18, 2009

    The brakes work fine for about 3 to 4 hrs straight and then all of a sudden the pedal would get sort of hard ,then it would work good again.The problem is temporary.I had the calipers service and change rubbers,after that the brakes was working perfect.Then one month after service the problem started over again,Please explain. Thank you.

  • pakeerah Apr 18, 2009

    How come after Iservice the calipers the brakes was working fine.I beleive that the caliper pistons are a bit sluggish [sticking]

  • pakeerah Apr 18, 2009

    Thank you.

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  • Nissan Master
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This problem is caused by a vacuum leak inside the power brake vacuum booster unit (rubber diaphram), here is a photo of that part which is under the hood, the brake master cylinder is mounted to it.

Brakes pedal gets hard sometimes while driving and - f121552.jpg

Posted on Apr 18, 2009

  • yadayada
    yadayada Apr 18, 2009

    this will not cause the problem u are discribing, we do this for free easy on the rating there.

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  • Master
  • 1,902 Answers

BRake pedal getting hard is one of three things. Either you are low on fluid. Your master cyclinder is going bad, slave cylinder is going bad. If you petal gets hard when just pumping the brakes then it is a master cylinder problem not returning the fluid back. If it gets hard when you just step on them to come to a stop then it is the slae cylinder not letting enough fluid get to the brakes.

Posted on Apr 18, 2009

  • Jeremy Reddick
    Jeremy Reddick Apr 18, 2009

    Like I said before you need to check your master cyclinder. This is not a caliper issue otherwise you would notice dragging all the time

  • Jeremy Reddick
    Jeremy Reddick Apr 18, 2009

    People always go to the logical problem. That it would be the caliper. But they neglect the fact that the mastercyclinder can be having problems. This is a fairly common problem. And since you already changed things on the calipers themselves everything should be in working order as long as they did the install correctly and also since it is speradic this problem also seems to indicate a MC problem

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Posted on Jan 02, 2017

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