New to me 4th Gen issue. Youtube included

[soloone]

I figure this post was okay here do it being 4th gen specific, If not Mods please delete.

I think...

Just picked up the 2007 Limited V6. It was doing this during my test drive and allowed me a negotiate a lower price. I am having problem and in the manual i downloaded i cant find this specific part. As you can see in the Video below, the Compressor or pump (Gold mechanism)) seems to be on a constant cycle. I think it is the break booster that should cycle when pressure is needed... but not every 5 seconds.

Any clue to what the part is?
Better question - Any clue on what the solution is?

<iframe width="420" height="315" src="https://www.youtube.com/embed/m4kGovOCYk8" frameborder="0" allowfullscreen></iframe>

<iframe width="420" height="315" src="https://www.youtube.com/embed/bbd390uK3Is" frameborder="0" allowfullscreen></iframe>

 

[t-man]

I figure this post was okay here do it being 4th gen specific, If not Mods please delete.

I think...

Just picked up the 2007 Limited V6. It was doing this during my test drive and allowed me a negotiate a lower price. I am having problem and in the manual i downloaded i cant find this specific part. As you can see in the Video below, the Compressor or pump (Gold mechanism)) seems to be on a constant cycle. I think it is the break booster that should cycle when pressure is needed... but not every 5 seconds.

Any clue to what the part is?
Better question - Any clue on what the solution is?

<iframe width="420" height="315" src="https://www.youtube.com/embed/m4kGovOCYk8" frameborder="0" allowfullscreen></iframe>

<iframe width="420" height="315" src="https://www.youtube.com/embed/bbd390uK3Is" frameborder="0" allowfullscreen></iframe>

well....if that master cylindervis bad, expensive! you may be able to find a used one cheap though. why is your brake pedal squeaking like that???

 

[soloone]

well....if that master cylindervis bad, expensive! you may be able to find a used one cheap though. why is your brake pedal squeaking like that???

It doesn't seem to be the Master cylinder as in what i believe to me the master assembly in the white item in the picture.

Rather the Gold cylinder to the left is whats making the noise and cycling. IN the second video (in the Cab) the truck is at idol. I am assuming the in cabin noise is the same as the cycle. I am not as big of a mechanical Newb as I sound here I swear. Thanks for the help guys.

 

[t-man]

It doesn't seem to be the Master cylinder as in what i believe to me the master assembly in the white item in the picture.

Rather the Gold cylinder to the left is whats making the noise and cycling. IN the second video (in the Cab) the truck is at idol. I am assuming the in cabin noise is the same as the cycle. I am not as big of a mechanical Newb as I sound here I swear. Thanks for the help guys.

The brakes are hydraulic on our trucks and that cylinder us boosting the pressure. Either you have a leak, which you would figure out quick, or something in that assembly is going bad.

Sent from the drivers seat of my 05 4runner.

 

[soloone]

The brakes are hydraulic on our trucks and that cylinder us boosting the pressure. Either you have a leak, which you would figure out quick, or something in that assembly is going bad.

Sent from the drivers seat of my 05 4runner.

Yes, I do understand. Pressure seems to be fine. I don't feel a change in pressure to kick on the booster. For example, i would assume that after a few hard slams on the brake pedal it would kick on and not on a continue cycle that makes me think the control unit is acting up.

 

[sonerick]

Here are some threads on the subject that might give you some more info:

http://www.toyota-4runner.org/4th-gen-t4rs/209190-hydroboost-brake-booster-accumulator-run-cycle-history-failure.html

http://www.toyota-4runner.org/4th-gen-t4rs/120125-hydraboost-brake-assembly.html

 

[soloone]

Here are some threads on the subject that might give you some more info:

http://www.toyota-4runner.org/4th-gen-t4rs/209190-hydroboost-brake-booster-accumulator-run-cycle-history-failure.html

http://www.toyota-4runner.org/4th-gen-t4rs/120125-hydraboost-brake-assembly.html

Thanks man! missed that in the search.


this one was helpfull also.

http://www.toyota-4runner.org/4th-gen-t4rs/189162-brake-booster-abs.html