New discs and pads - low pitched whine/honk when driving off
Discussion
Hi all,
Changed the discs and pads all round on a 2006 Toyota Auris. All went swimmingly and it brakes nicely. There appear to be no sticking calipers.
However if it's been parked with the handbrake on for a little while, it'll make a bit of a honking/whining noise when driving off, for the first 20 yards or so. Pulling the handbrake up stops it so I presume it's the rear pads vibrating as they release.
It's not a squeal, it's more like the sound you get when you blow over the top of a bottle!
Wheels don't get hot and everything else is spot on. I used a sensible amount of grease on the back of the pads.
Will it stop after a while? Just need to bed in, perhaps?
Changed the discs and pads all round on a 2006 Toyota Auris. All went swimmingly and it brakes nicely. There appear to be no sticking calipers.
However if it's been parked with the handbrake on for a little while, it'll make a bit of a honking/whining noise when driving off, for the first 20 yards or so. Pulling the handbrake up stops it so I presume it's the rear pads vibrating as they release.
It's not a squeal, it's more like the sound you get when you blow over the top of a bottle!
Wheels don't get hot and everything else is spot on. I used a sensible amount of grease on the back of the pads.
Will it stop after a while? Just need to bed in, perhaps?
Dave Brand said:
Did the pads move freely in the calipers when you fitted them? You need to make sure that the mating faces where the pads slide are clean & rustfree - sometimes, particularly with aftermarket pads, it's necessary to file the edges of the pads to ensure free movement.
Yep, was all fine, I cleaned up the caliper carriers and such. They'd grip the discs nice and tight with the handbrake on and when released, the discs could be freely spun by hand, with only the very feint usual scraping you'd get due to the tiniest bit of contact. In fairness it's not doing it as much now, so I think they're just bedding in!
What you're describing is called brake moan, if the car has a resonance issue, the disc/pad interface is conditioned right and there's a light contact it will happen.
Annoying but there's no adverse affect. Some cars are more sensitive than others, often you'll find that swinging some steering lock on at crawling speed in some cars produces the odd honk. It can be mistaken for power steering noise on an older car.
If it really is the handbrake as opposed to the engagement of the handbrake killing the resonance then you should look into it as it means it's dragging slightly.
Annoying but there's no adverse affect. Some cars are more sensitive than others, often you'll find that swinging some steering lock on at crawling speed in some cars produces the odd honk. It can be mistaken for power steering noise on an older car.
If it really is the handbrake as opposed to the engagement of the handbrake killing the resonance then you should look into it as it means it's dragging slightly.
The Wookie said:
What you're describing is called brake moan, if the car has a resonance issue, the disc/pad interface is conditioned right and there's a light contact it will happen.
Annoying but there's no adverse affect. Some cars are more sensitive than others, often you'll find that swinging some steering lock on at crawling speed in some cars produces the odd honk. It can be mistaken for power steering noise on an older car.
If it really is the handbrake as opposed to the engagement of the handbrake killing the resonance then you should look into it as it means it's dragging slightly.
Brake moan! I knew there'd be a name for it!Annoying but there's no adverse affect. Some cars are more sensitive than others, often you'll find that swinging some steering lock on at crawling speed in some cars produces the odd honk. It can be mistaken for power steering noise on an older car.
If it really is the handbrake as opposed to the engagement of the handbrake killing the resonance then you should look into it as it means it's dragging slightly.
Thanks for your reply. There appear to be no signs of brake sticking/grabbing. Indeed, it doesn't do it for longer than the first few seconds of driving off, but if you steer sharply within that time it does change the intermittency (is that a word? It is now..) of the noise. What I meant was that if it does it, pulling the handbrake whilst the car is moving makes it stop, so it was only my means of identifying the cause of the noise
.Howard- said:
Brake moan! I knew there'd be a name for it!
Oh there's a name for it alright... Weeks of my life wasted driving slowly around car parks steering from lock to lock!It is the lightest contact that causes it, not enough to cause a serious problem but enough to waste a bit of fuel and knock a bit of performance off if it's doing it in a straight line. It may have always been like it though and only triggered by a change in pad compound so best to keep an ear on it as if it gets more frequent it could indicate something sticking slightly!
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