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Kaukapakapa,
No I didn't try putting it in neutral, didn't think there was any point. Squeal already stopped at times just lighten the foot of the accelerator and coasting, so yes it can be load sensitive. But suspension work affected it too. Hence thought it was a loose bearing changing the orientation of brake rotor to caliper, but load related micro movements with healthy bearings may already be enough. Couldn't really force it to come on, it would just start at some stage during a drive, for short moments initially, then get more constant as drive continued. But I had it also squealing right down to a stop and pitch did not change, that is what it makes me think its resonance, pitch purely determined by the mass of the vibrating body. It did do it also when towing a caravan of 2.3t, symptoms exactly the same, but caravan brake controller is inertia sensing and brake rate is adjusted to match that of the Prado. Very hard to locate by listening, comes sort off from everywhere, sound probably reflected and bounced around off the road, and may be not just one brake doing it, assuming that is the actual cause. Hence also not being able to demo it to anyone, more or less guessing and checking possible causes one after another. Depends really when your squeals started, mine in both cases with pads around half worn. I do a lot of suburbia driving during the week, mostly prefer driving in S so and pushing down on stops, so half worn is roughly at 40000km. If one did a lot highway cruising it would take longer and also would be longer to get through the squealy period due to reduced brake wear. A trailer of your stated weight would be braked and hence with brakes adjusted with matching brake rate to Prado would hence not affect brake wear rate.
No I didn't try putting it in neutral, didn't think there was any point. Squeal already stopped at times just lighten the foot of the accelerator and coasting, so yes it can be load sensitive. But suspension work affected it too. Hence thought it was a loose bearing changing the orientation of brake rotor to caliper, but load related micro movements with healthy bearings may already be enough. Couldn't really force it to come on, it would just start at some stage during a drive, for short moments initially, then get more constant as drive continued. But I had it also squealing right down to a stop and pitch did not change, that is what it makes me think its resonance, pitch purely determined by the mass of the vibrating body. It did do it also when towing a caravan of 2.3t, symptoms exactly the same, but caravan brake controller is inertia sensing and brake rate is adjusted to match that of the Prado. Very hard to locate by listening, comes sort off from everywhere, sound probably reflected and bounced around off the road, and may be not just one brake doing it, assuming that is the actual cause. Hence also not being able to demo it to anyone, more or less guessing and checking possible causes one after another. Depends really when your squeals started, mine in both cases with pads around half worn. I do a lot of suburbia driving during the week, mostly prefer driving in S so and pushing down on stops, so half worn is roughly at 40000km. If one did a lot highway cruising it would take longer and also would be longer to get through the squealy period due to reduced brake wear. A trailer of your stated weight would be braked and hence with brakes adjusted with matching brake rate to Prado would hence not affect brake wear rate.
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