2000 4runner brakes pulsing on startup
#1
2000 4runner brakes pulsing on startup
Hey Guys, I need some help with my 2000 4runner. Over the past week when I engage in drive the brakes pulse really hard 4-6 times while im just rolling, then let off giving me no issues while driving. Hoping someone has seen this issue before. let me know!
#2
Contributing Member
What do you mean by pulsing? Like the ABS engaging or the brake rotors are warped pulse? If the rotors are warped you should feel it in the steering wheel.
#4
Contributing Member
Doesn't make sense, sure it is the brakes? If you are not touching the brake pedal then the only thing that could be causing this is the ABS but even that generally only stops pressure to the brakes, it doesn't make it. At least on older/simpler cars like this.
It would seem more likely that it is the transmission or possibly an engine tuning issue. Could be the engine hiccuping/misfiring which I guess could feel like the brakes since you would loose power for a second.
It would seem more likely that it is the transmission or possibly an engine tuning issue. Could be the engine hiccuping/misfiring which I guess could feel like the brakes since you would loose power for a second.
#5
Thanks TA, that may be the issue. The truck actually wont roll when i put it in drive until i press the gas, then it grabs violently 3-5 times before letting go. I can feel it mainly in the front but a little in the back as well. I would love to be able to diagnose it and try to fix it myself as much as possible. I can tell there is something holding the truck when its in drive but before i give it gas (feels like the brakes?)
#6
Contributing Member
Have you tried putting it in Low instead of drive? What about reverse?
It might be a stuck brake rotor although kinda odd for it to grab a few times. Usually they are either locked or act like driving with the Emergency brake.
It could also be the parking brake not fully disengaging although odd and rare. Also odd that it goes away, it should pretty much keep doing it.
Could be an engine problem, does it do the same thing no matter how you press the gas pedal? Aka, little gas or a lot of gas?
It might be a stuck brake rotor although kinda odd for it to grab a few times. Usually they are either locked or act like driving with the Emergency brake.
It could also be the parking brake not fully disengaging although odd and rare. Also odd that it goes away, it should pretty much keep doing it.
Could be an engine problem, does it do the same thing no matter how you press the gas pedal? Aka, little gas or a lot of gas?
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#8
Contributing Member
Could try jacking up the rear axle (put it in 2wd first obviously). Then try it and see what happens. Might shed some light on it. Have someone listen to see where the sound is coming from.
#10
Registered User
Have you tried putting it in Low instead of drive? What about reverse?
It might be a stuck brake rotor although kinda odd for it to grab a few times. Usually they are either locked or act like driving with the Emergency brake.
It could also be the parking brake not fully disengaging although odd and rare. Also odd that it goes away, it should pretty much keep doing it.
Could be an engine problem, does it do the same thing no matter how you press the gas pedal? Aka, little gas or a lot of gas?
It might be a stuck brake rotor although kinda odd for it to grab a few times. Usually they are either locked or act like driving with the Emergency brake.
It could also be the parking brake not fully disengaging although odd and rare. Also odd that it goes away, it should pretty much keep doing it.
Could be an engine problem, does it do the same thing no matter how you press the gas pedal? Aka, little gas or a lot of gas?
Also try parking overnight with the e-brake disengaged. If the problem does not appear, then you have your smoking gun.
Last edited by TheDurk; 12-08-2012 at 08:43 PM.
#11
Contributing Member
This may be odd and rare in Texas, but up here in the salt belt the bell cranks on the backsides of the drums (where the cables attach) are prone to corrode up and stick. (I don't see where the op is from). It is common for them to stay engaged at startup and then release after you have driven a short distance. So I suggest you check and lube your bellcrank pivots. Worth ruling out.
Also try parking overnight with the e-brake disengaged. If the problem does not appear, then you have your smoking gun.
Also try parking overnight with the e-brake disengaged. If the problem does not appear, then you have your smoking gun.
The parking brake is the transmission brake inside the transmission. It is basically a steel band with some notches in it. Should it not fully disengage it is possible that those notches could cause what he is feeling although pretty unlikely.
#12
Registered User
You got it mixed up, see the line above the one you bolded for the emergency brake. I basically said the same thing and yes it is also rare in Texas but happens.
The parking brake is the transmission brake inside the transmission. It is basically a steel band with some notches in it. Should it not fully disengage it is possible that those notches could cause what he is feeling although pretty unlikely.
The parking brake is the transmission brake inside the transmission. It is basically a steel band with some notches in it. Should it not fully disengage it is possible that those notches could cause what he is feeling although pretty unlikely.
http://tacoma.site40.net/4Runner_96-...br/pbl/ovi.pdf
So forgive me my confusion.
[They refer to the other as 'transmission parking lock', which is a more accurate description. As you state, it is not a brake at all.]
But, aside from terminology, we are on the same page, I think. He should check his bellcranks--especially if he ever sees salt.
Last edited by TheDurk; 12-09-2012 at 08:35 AM.
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