06 4Runner Brake question

[Romer]

My wife is all concerned about a noise she hears in her new 4runner. When you come to a complete stop and have your foot on the brake for 15 seconds, you hear a slight clunk. I am thinking the computer is adjusting the brakes as you are at a complete stop to take pressure off the rotors, but thats a guess.

Anyone know what this is?

 

[bulldog-yota]

It's the famous driveline binding. I assume it is a 4WD. SO just lube the slipjoints and it will get better after a few K miles. I would recommend you lube it now and then every 5K service till 20K. AFter that you will need to lube it as required. AT least it will get better with time.

I'm sure you know what to do. If not check out
http://www.toyota120.com/html/driveline_service.html

I had the same issue on my 03 4R adn it is pretty much gone after 60K. I lube it every 10-20k miles and haven't had a clunk for ages. Lexus issued a TSB for the GX with the same issue, actually the GX is worse due to the softer suspension. They replaced the rear control arms and driveshaft. CLunk free since then. Toyota however have refused to do anything about it yet, but the 4R seems to be far less of a problem.

 

[Romer]

It's 2 weeks old. So I guess I'll have the dealer do it.

 

[Romer]

I called the dealer and talked to them about it and the service guy said it's something called "drive by wire" and its disengaging the torque converter. he said after we drive it a while longer the computer will learn more and it will get better.

The classic Drive shaft issue was supposedly fixed in 2005 with a new drive shaft design. This was corroborated by a thread on yotatech.

This doesn't sound quite right to me, but we will give it a little while.

 

[bulldog-yota]

See how it goes, but my money is still on the driveshaft. They gave me all sorts of weird and wonderful stories on my 03 as well, from trans downshifting to torque converter adn computer learning, yada, yada. Then I just lubed the driveshaft and it all went away. Seems like Toyota transmission ECUs work on grease in the driveshaft

Let us know, how it goes. Hopefully the newer driveshafts bed in quicker than the old ones and your problem will go away. The trans is the same one as on the new 100s, so if their theory holds true the 100 guys with the 5 spd wil also have the same problem.

 

[FirstToy]

Romer,
Does it happen with the foot on the brake and completely motionless or does it happen just when you are inching to a stop or releasing brake to start moving again?

It sounds like driveshaft thunk but it may also be related to EBFD (elec. brake force dist).

 

[Romer]

Romer,
Does it happen with the foot on the brake and completely motionless or does it happen just when you are inching to a stop or releasing brake to start moving again?

It sounds like driveshaft thunk but it may also be related to EBFD (elec. brake force dist).

Only when the foot is one the brake and completely motionless after about 10-15 seconds. Not a clunck like I had in my 80 with the drive shaft issue, it's a lot softer than that.

 

[FirstToy]

hmm well the driveshaft thunk (from my experience in the 4R) happens as you come to a stop (building up pressure on DS) and then when you release the brake, "thunk".

Or, when you accelerate from a stop and initally get the "thunk".

I would play w/ it and modulate the brake- kind of feather the brake lightly to a stop. I would never get the "thunk" if I released the pressure before complete stop in this manner.

I completely ignored the "thunk" and it eventually went away. I think it took a year or so.

Do you feel it in the pedal or in the seat?
Open the hood and turn the key to ACC. You can hear the EBFD charge up, this also can be felt in the brake pedal. Occaisionally, when starting out, the EBFD could be felt in the brake pedal as it "warmed up".
I don't know if the 06 still does this.

Just some ideas...

 

[bulldog-yota]

Romer, you describe exactly the thunk/clunk we had on the GX. For some reason it took time after coming to a fullstop with foot on the brake to thump. Especially if you brake slightly harder to come to a stop. The 4R for some reason thunked as soon as you start driving off again. ANd then sometimes they decide to swap. The GX was a lot softer than the 4R (05 vs 03 perhaps).

Either way on both of them it came back as the driveline issue. Fortuantely both are fixed now. The 4R with some good workouts and grease adn the GX with a TSB.

See if it keeps up and what they do to fix it.

 

[sisukid1975]

It's the famous driveline binding. I assume it is a 4WD. SO just lube the slipjoints and it will get better after a few K miles. I would recommend you lube it now and then every 5K service till 20K. AFter that you will need to lube it as required. AT least it will get better with time.

I'm sure you know what to do. If not check out
http://www.toyota120.com/html/driveline_service.html

I had the same issue on my 03 4R adn it is pretty much gone after 60K. I lube it every 10-20k miles and haven't had a clunk for ages. Lexus issued a TSB for the GX with the same issue, actually the GX is worse due to the softer suspension. They replaced the rear control arms and driveshaft. CLunk free since then. Toyota however have refused to do anything about it yet, but the 4R seems to be far less of a problem.

My new (to me) '03 Runner is doing the same thing. I'll give this a try.



Fred

 

[bh4rnnr]

Sounds like a drive shaft to me.. GX's make a "thunking" noise when stopping... The lates fix is to replace the drive shaft and control arms for the rear. Romer, just to make sure, it's not the pads shifting?? Usually only happens after going into drive from reverse etc...

 

[sisukid1975]

I greased the slip joint per Bulldog's advice and the clunk is mostly gone. I can still hear it a bit, especially when stopping hard and then starting out again, but for the most part it's gone.

I'll grease it again in next tiem I change the oil, and that might take care of it altogether.

Fred