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vibration under light braking

Discussion in 'Other Vehicle Discussions' started by Dman1100, Dec 2, 2004.

  1. Dman1100

    Dman1100 Senior Member

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    my 240 is making a nasty sound/vibration under light braking. it stops when the pedal is depressed harder. i'm not real sure if it's the vacuum or if the problem lies in the brake booster. anyone experience this or have any ideas? it also seems to affect the idle slightly. i have removed the aiv and plugged the vacuum lines going to it.
     
  2. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Warped rotors?
     
  3. Kcihcaton

    Kcihcaton Senior Member

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    That was my first thought, but warped rotors would cause vibration throughout braking, not just light braking... at least if they're warped badly.
    :shrug:
     
  4. civicious

    civicious FüK-VTEC VIP

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    Never too early to get your rotors turned.
     
  5. Slammed90Lude

    Slammed90Lude Senior Member

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  6. Dman1100

    Dman1100 Senior Member

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    it's not the rotors because it also makes this vibration while at a stop. i'm almost certain it's the diaphram pulsating back and forth. but i don't know whether the problem lies in the booster or the vacuum system.
     
  7. civicious

    civicious FüK-VTEC VIP

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    hehe...diaphram...hehe...
     
  8. Seany-izzle

    Seany-izzle New Member

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    hahaahah thats exactly what i said...
     
  9. K2e2vin

    K2e2vin Senior Member

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    maybe a bad check valve or the diaphram is leaking. from the sound of it, it sounds like it might not be sealing/closing right. the vibration you feel is probally from the brake booster going on and off(air going in and out, when air is supposed to be pulled out at all times)
     
  10. Dman1100

    Dman1100 Senior Member

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    Thats what i'm thinking where could the check valve be? that would be the easiest fix. i hope it's not the booster, that would just be a pain in the ass
     
  11. K2e2vin

    K2e2vin Senior Member

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    its usually white and around the master cylinder; follow the vacuum hose to the booster and it should be inline with the hose(looks like a male coupler). heres where it is on a crx: [​IMG]
     
  12. Dman1100

    Dman1100 Senior Member

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    thanks i'll check it this weekend
     
  13. TurboMirage

    TurboMirage YEEAAAHHH VIP

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    my 240sx didnt have one.
     
  14. K2e2vin

    K2e2vin Senior Member

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    it maybe has a built in one? i looked around and didnt find anything one the internet about a 240sx having a check valve. unless it has a totally different brake booster system, there has to be something that keeps vacuum in the brake booster.
     
  15. hcivic.com

    hcivic.com Senior Member

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    the rotors need turning they will vibrate under light braking but with the extra force from hard braking it will go away
     
  16. K2e2vin

    K2e2vin Senior Member

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    when my rotors were warped it actually got worse the harder you step on the brakes.
     
  17. hcivic.com

    hcivic.com Senior Member

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    not warped just cut up if there warped turning won't help
     
  18. Dman1100

    Dman1100 Senior Member

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    the check valve is alright so it's probably in the booster. does anyone know if the brakes need bleeding when you work with the booster?
     
  19. K2e2vin

    K2e2vin Senior Member

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    if you remove the MC or anywhere where brake fluid comes out(like some lines), yes.
     
  20. Dman1100

    Dman1100 Senior Member

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    thats what i thought but wasn't sure if you could keep the system closed and still get to the booster. looks like i've got something to do for a while. i need to do it even worse now that the brake light comes on once in a while
     
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