Hi guys,
I have a 2007 Prado 120 series (120,000k)
Every 4 seconds or so the ABS pump kicks in and a very audible squeal is heard (it's loud inside the cabin).
Have googled and found a video very similar to what I am experiencing:
http://www.youtube.com/watch?v=sh14T2Yq2ZE
the best explanation I can come up with is that the ABS pump is pressurizing the accumulator and when the pump turns off it returns back past some valve, the valve is leaking (maybe due to an air lock) causing the noise.
The returning pressure is vibrating a seal somewhere making a sound in much the same way as if you let air from a balloon while pinching closed the opening.
there are no warning lights on, breaking seems fine
Mu friendly local mechanic (friend of the family) took it to Toyota as he wasn't game to work on it. This was the start of warning bells happening. Toyota, in their infinite generosity, quoted me $3000 for the privilege of letting them repair it for me.
I took it to another the local shop (Ultratune) for 2nd opinion and they bled the brakes and said there was air in the lines. all good!
Alright! $3000 back in my pocket
$285 and 3 days later the noise returned.
Took it back to the shop and they speculated that air was still getting into the lines. they suggested sending it to a "specialist"...$60 to quote for it and saying anything up to $1800 (better than $3000 at least)
hmmmm.
The brake booster assembly is now interstate for a quote with some specialist but I can't help but think I've got sucker stamped on my forehead here, there's gotta be an explanation and surely someone else has had this problem before? what happened to the guy in the video above?.
Maybe they did not bleed it properly. the brakes are fine and not spongy, stops well, no error codes.
One thing I haven't done yet (in hind sight) is forced the ABS to work to see if it pushes any air through the accumulator and so stop the squeaking...
running out of ideas, please help
I have a 2007 Prado 120 series (120,000k)
Every 4 seconds or so the ABS pump kicks in and a very audible squeal is heard (it's loud inside the cabin).
Have googled and found a video very similar to what I am experiencing:
http://www.youtube.com/watch?v=sh14T2Yq2ZE
the best explanation I can come up with is that the ABS pump is pressurizing the accumulator and when the pump turns off it returns back past some valve, the valve is leaking (maybe due to an air lock) causing the noise.
The returning pressure is vibrating a seal somewhere making a sound in much the same way as if you let air from a balloon while pinching closed the opening.
there are no warning lights on, breaking seems fine
Mu friendly local mechanic (friend of the family) took it to Toyota as he wasn't game to work on it. This was the start of warning bells happening. Toyota, in their infinite generosity, quoted me $3000 for the privilege of letting them repair it for me.
I took it to another the local shop (Ultratune) for 2nd opinion and they bled the brakes and said there was air in the lines. all good!
Alright! $3000 back in my pocket
$285 and 3 days later the noise returned.
Took it back to the shop and they speculated that air was still getting into the lines. they suggested sending it to a "specialist"...$60 to quote for it and saying anything up to $1800 (better than $3000 at least)
hmmmm.
The brake booster assembly is now interstate for a quote with some specialist but I can't help but think I've got sucker stamped on my forehead here, there's gotta be an explanation and surely someone else has had this problem before? what happened to the guy in the video above?.
Maybe they did not bleed it properly. the brakes are fine and not spongy, stops well, no error codes.
One thing I haven't done yet (in hind sight) is forced the ABS to work to see if it pushes any air through the accumulator and so stop the squeaking...
running out of ideas, please help
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