u/rmv74

Looking for some advice from CX-9 owners/mechanics.

I have a 2018 Mazda CX-9 with approximately 129,000 km. The car has been serviced on time throughout its life.

Recently I've developed a continuous **"**wo wo wo wo" / humming-type noise which sounds like it's coming from one or more of the wheels. It increases with road speed and seems to become more noticeable when braking.

I initially thought it might be a wheel bearing, axle/CV, brakes or something similar.

I took it to my regular mechanic at Ultra Tune. They inspected the wheels/brakes during the service and didn't find an obvious problem with the wheel/brake drum/disc. They suggested it could potentially be tyre wear.

I then took it to JAX Tyres, who performed a wheel alignment, balance and rotation yesterday.

The strange thing is that the noise is now noticeably worse.

I'm also now getting a vibration through the brake pedal and steering wheel when braking at around 40 km/h and below. The car otherwise drives straight, feels stable and brakes normally.

I'm wondering if the tyre rotation has simply moved a badly worn/cupped tyre to the front, or whether I'm dealing with something like:

• Cupped/scalloped tyre
• Wheel bearing/hub
• Brake disc runout / thickness variation
• Sticking brake calliper
• Bent dust shield/backing plate
• Wheel/tyre runout
• CV axle/driveshaft
• Suspension component

Has anyone experienced something similar on a CX-9?

What would you check first?

Also, is there a good way of distinguishing a cupped tyre from a wheel bearing without simply replacing parts and hoping for the best?

Thanks!

What are the chances, this wasn't planned. We don't have control when divorces are presented to the courts.
I take it as a sign, I did the right thing. Thank you Galaga.

What are the chances, this wasn't planned. We don't have control when divorces are presented to the courts.
I take it as a sign, I did the right thing. Thank you Galaga.

Current plan with Origin expires 17 June. I've spent the last week researching every retailer in QLD and the best I've landed on so far is Red Energy Qantas Red Solar Saver:

• Supply: 135.06c/day
• Usage: 32.84c/kWh (single rate, not TOU)
• Solar FiT: 5c/kWh flat, no daily cap
• 10,000 bonus Qantas Points + 2 pts per $1 ongoing
• No contract, no exit fees

My setup:

• 8.2kW solar (Fronius Primo), exporting ~20 kWh/day average
• Smart meter
• Usage ~16 kWh/day average
• Natuaral Gas hot water (separate provider)

What I'm leaving:

• Origin Go Solar Variable
• 116.44c/day supply, 28.73c/kWh flat rate
• 6c FiT on first 721 kWh/billing period then drops to 3c

The flat 5c FiT with no cap was the main reason I went Red, most plans cap the good rate at 8-10 kWh/day which kills the value when you're exporting 20+.

Has anyone found anything better for high solar exporters in SE QLD? Also interested if anyone's had luck with Origin win-back offers after switching.

Current plan with Origin expires 17 June. I've spent the last week researching every retailer in QLD and the best I've landed on so far is Red Energy Qantas Red Solar Saver:

• Supply: 135.06c/day
• Usage: 32.84c/kWh (single rate, not TOU)
• Solar FiT: 5c/kWh flat, no daily cap
• 10,000 bonus Qantas Points + 2 pts per $1 ongoing
• No contract, no exit fees

My setup:

• 8.2kW solar (Fronius Primo), exporting ~20 kWh/day average
• Smart meter
• Usage ~16 kWh/day average
• Gas hot water (separate provider)

What I'm leaving:

• Origin Go Solar Variable
• 116.44c/day supply, 28.73c/kWh flat rate
• 6c FiT on first 721 kWh/billing period then drops to 3c

The flat 5c FiT with no cap was the main reason I went Red — most plans cap the good rate at 8-10 kWh/day which kills the value when you're exporting 20+.

Has anyone found anything better for high solar exporters in SE QLD? Also interested if anyone's had luck with Origin win-back offers after switching.