Grinding noise when engine braking

[crofty1984]

Hello all,
My Alfa 147's doing something odd. I get a grinding noise from the front offside when slowing . Accelerating it's fine, constant speed it's fine and when braking it's fine. Just when you let off the gas. Brakes were replaced (pads and disks about 2 months ago.
Dan

[xuy]

I have a similar noise.

Layshaft bearing failure is the diagnosis.

[crofty1984]

I'm hoping it could be a sheared bolt on the brake calliper mount, maybe the back of the calliper touching the inside of the wheel?
If it's the layshaft the damn thing's going to the scrappy.

[Zad]

Jack up the wheel and see what it feels like when you spin it?

[crofty1984]

Will do. Just started on my way to work, so haven't had chance to do anything yet. Thanks for all the advice everyone!

[BritishRacinGrin]

You hope that you have a sheared brake calliper and you're driving it to work?

[Steff1965]

crofty1984 said:

Hello all,
My Alfa 147's doing something odd. I get a grinding noise from the front offside when slowing . Accelerating it's fine, constant speed it's fine and when braking it's fine. Just when you let off the gas. Brakes were replaced (pads and disks about 2 months ago.
Dan

Picked up a brand new Astra (64 plate) with only 20 milles on the clock and it was doing that but the noise was from the nearside. Gearbox was knackered and it had to be changed

[crofty1984]

I'm pleased(ish) to announce it was a loose wheel. I had the brakes done and didn't re-check the wheelnuts as I should have done. Not wobbling about all over the shop, but just enough to make a difference when not under load. Under load, the 1-2mm of movenemt would have been taken up in a "clonk" to the side of the hole and it would push against that, but when lifting off, the wheel's free to move round a bit more.

Jacked the car up, no wheel bearing movement (up,down,fore,aft) the brakes weren't binding or moving, plenty of meat left on the disks and pads and all seems to be well.