At stand still though?Quote:
Originally Posted by threedogs
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At stand still though?Quote:
Originally Posted by threedogs
ABS could be playing up,
EDIT: How is the pad wearing is it even or tapered to one end.
Heard ABS can be a PITB
ABS only pulse's when you lock up a wheel.
Not while the vehicle is stationary, abs should not be working at all then.
If it does you have abs issues.
The abs pulse you feel is abs unlocking / bypassing pressure to the brake that has locked for a part second.
Once the wheel is turning again it closes the by pass again and you have brake back at the wheel that was locked.
The pulsing, as felt under your brake pedal foot is a succession of abs cycles, unlocking and locking.
Think you are on track for a vacum leak somewhere as you thought.
Iv'e felt mine do similar as you describe,and it does not have abs.
only difference I don't recall speed playing a part.
that is I simply don't remember noticing problem after speed.
only a slight hick-up in reves and vacum, as I have spotted on the a vac gauge I installed .
one day I will catch up on chores and get to the bottom of it.
cheers
G'day Hodgie,
Tassie's point is valid and Robo's explained it well. ABS in my case has only been felt through the right foot in a sudden, dark brown underwear, panic situation, never at a slow down at the lights.
Clutch (if power assisted) and break systems should be seperate and therefore easily picked as the problem. Mind you, I've not checked the manual so I've possibly stuffed up again.
A/C is a big drain and you can feel it come on and see the revs. drop but I don't ever recall it 'pulsing'. After a speed run, stopping reduces air flow over the radiator and may increase engine temp. but that shouldn't effect the A/C..
Maybe crack a coldie, (I've got some top home brew recipes if you need help), and wait for Robo to came up with the goods.
In the meantime though, might be interesting to get the Missus or someone to cruise down an open country road , pull up to the usual type stop, get it pulsing, keep the foot/feet on the appropriate pedal while you leap out and get under the bonnet/wheel arch etc. etc. and see if you can locate the little swine.
Isn't life fun?
Regards,Col
Strewth!!!
'break',,,,,'seperate',,,,,
Aint home brew good
Col
Thanks a lot for all your input folks.
I attempted to replicate this phenomenon today without any luck. Although I was only doing 80 on the ring road for a while, nothing above.
I should describe this vibration a bit more. Few of you mentioned pulsing. It isn't pulsing as such, and I cannot feel it through the pedal (brake) and my foot at all. It's more of a vibration somewhere up front I believe. Kind of like something is loose and is rattling on top of the engine, but it feels heavy? If that sort of describes it. Kind of like a larger compressor running on a lower frequency.
Humm,
maybe try checking any idler pulleys for wear n tear.
these can chatter if dry and or worn out.
power steer pump possibly !.
some one recently wrote in a thread about aircon causing trouble.
it was locking motor up I think.
http://www.nissanpatrol.com.au/forum...e-air-con-pump
good luck keep us posted
The brake master vacum booster may have a leak or faulty check valve .
Bumping this back up to the top. Had a mechanic look for a vaccum leak and he's found nothing.
I'm now quiet certain, that it actually has nothing to do with the brakes. Today, as well as a few times recently this "vibration" kicked in when stopped, after a lengthy drive after a bit of power was needed. Was around kangaroo grounds today and a few hilly sections I pushed the car a bit and after a while, when I've come to a stop sitting at the lights, this vibration kicks in!
It's very hard to explain... It's like something is rattling all of a sudden somewhere under the hood and is felt inside the car. Opening the window to try and listen to it from the outside reveals nothing. Next set of lights, it goes away, like nothing ever happened.
A slight tap on the gas pedal makes it go away. SO it's happening during idle after a bit of a drive when pushing the engine.
Once again, I do not lose any power, nor does the car feel any different.
I'm stumped as to what it could be.
G'day again Hodgie,
been off screen a few days and nice to see you're still enoying life.
The absolute duck's guts, spotty the dog, SOB problem is the 'intermittent' one and looks like you've got a beauty.
Still think your only hope is the long drive off road so you can push it, stop as often as it takes without passing traffic danger and then when it starts, get out and go searching. Touch nothing as long as it continues, well not the throttle from what you say and if need be, get a longish screwdriver and use it as a stethoscope under, over and in the guts to find the source.
Nothing you've described so far gives me any idea where to start (not that that's surprising) so for mine you're still at the make it start and then find it stage.
'All the best,
Col