Uneven brake disc wear
Discussion
The usual "bedding-in" procedure for new pads is not to conform the pads to the worn disc, but to heat them to their maximum operating temp and finally 'cure' them. BUt it might be worthwhile using it here to do the first!
On a suitable stretch of road, brake from progressively higher speeds to a walking pace, until you do so from as fast as the road will allow, preferably as fast as you will ever drive - 70mph? Do not stop, do not keep your foot on the brake for any longer than absolutely necessary, and when done drive home using the brakes as little as possible to allow them to cool.
In this case, then inspect the discs - are the pads bearing across their full perimeter now? If not, then I suggest a more detailed inspection!
John
On a suitable stretch of road, brake from progressively higher speeds to a walking pace, until you do so from as fast as the road will allow, preferably as fast as you will ever drive - 70mph? Do not stop, do not keep your foot on the brake for any longer than absolutely necessary, and when done drive home using the brakes as little as possible to allow them to cool.
In this case, then inspect the discs - are the pads bearing across their full perimeter now? If not, then I suggest a more detailed inspection!
John
tapkaJohnD said:
The usual "bedding-in" procedure for new pads is not to conform the pads to the worn disc, but to heat them to their maximum operating temp and finally 'cure' them. BUt it might be worthwhile using it here to do the first!
On a suitable stretch of road, brake from progressively higher speeds to a walking pace, until you do so from as fast as the road will allow, preferably as fast as you will ever drive - 70mph? Do not stop, do not keep your foot on the brake for any longer than absolutely necessary, and when done drive home using the brakes as little as possible to allow them to cool.
In this case, then inspect the discs - are the pads bearing across their full perimeter now? If not, then I suggest a more detailed inspection!
John
Seems a well-known pad manufacturer has a different opinion. On a suitable stretch of road, brake from progressively higher speeds to a walking pace, until you do so from as fast as the road will allow, preferably as fast as you will ever drive - 70mph? Do not stop, do not keep your foot on the brake for any longer than absolutely necessary, and when done drive home using the brakes as little as possible to allow them to cool.
In this case, then inspect the discs - are the pads bearing across their full perimeter now? If not, then I suggest a more detailed inspection!
John
https://www.ferodo.co.uk/blog/give-brakes-a-break....
tapkaJohnD said:
The usual "bedding-in" procedure for new pads is not to conform the pads to the worn disc, but to heat them to their maximum operating temp and finally 'cure' them. BUt it might be worthwhile using it here to do the first!
On a suitable stretch of road, brake from progressively higher speeds to a walking pace, until you do so from as fast as the road will allow, preferably as fast as you will ever drive - 70mph? Do not stop, do not keep your foot on the brake for any longer than absolutely necessary, and when done drive home using the brakes as little as possible to allow them to cool.
In this case, then inspect the discs - are the pads bearing across their full perimeter now? If not, then I suggest a more detailed inspection!
John
Bedding is not needed by OEM spec pads that's pretty much only really needed by some more aggressive "race" spec padOn a suitable stretch of road, brake from progressively higher speeds to a walking pace, until you do so from as fast as the road will allow, preferably as fast as you will ever drive - 70mph? Do not stop, do not keep your foot on the brake for any longer than absolutely necessary, and when done drive home using the brakes as little as possible to allow them to cool.
In this case, then inspect the discs - are the pads bearing across their full perimeter now? If not, then I suggest a more detailed inspection!
John
But that being said a few hard application of the breaks shoud help get the pads wearing Better by helping them cut through that bit of rust
fatboy b said:
Seems a well-known pad manufacturer has a different opinion.
https://www.ferodo.co.uk/blog/give-brakes-a-break....
Whereas I follow Carroll Smith, who knew a thing or two. See "Prevention"https://www.ferodo.co.uk/blog/give-brakes-a-break....
https://www.brakes-shop.com/brakepedia/general/myt...
John
tapkaJohnD said:
The usual "bedding-in" procedure for new pads is not to conform the pads to the worn disc, but to heat them to their maximum operating temp and finally 'cure' them. BUt it might be worthwhile using it here to do the first!
Pads for road use are commonly scorched as a final operation during manufacture to ensure rapid bedding in & eliminate the need to be taken up to high temperatures on the vehicle to optimise performance.Grabbing the steering wheel and wrenching the thread back on course, why concentrate on a controversy irrelevant to the OP?
The OP wanted a way to get his pads to contact the whole face of the disc. My suggestion was that contrary to usual theory, the traditional 'bedding in' might achieve that, quicker (better?) than waiting hundreds of miles. I still say so, do you say diferent?
JOhn
The OP wanted a way to get his pads to contact the whole face of the disc. My suggestion was that contrary to usual theory, the traditional 'bedding in' might achieve that, quicker (better?) than waiting hundreds of miles. I still say so, do you say diferent?
JOhn
MrTank, did you 'exercise' the pistons a few times to make sure they are free moving in their bores?, ie by getting an assistant to pump them out gently whilst you watch and push them back?
Ages since i changed Honda pads but do they have those stainless steel sprung clips that the edges of the pad backing plates sit against rather than the pad edge sliding against the caliper itself...if so ping those clips off and give the caliper and clips themselves a good wire brushing, you might find the pad an easier fit once you've done that, get the same issue on Subarus.
I bed pads in exactly as Ferodo suggest in the link, when you fit new pads to an existing disc only a percentage of each pad will be in contact with the disc at first, those contact areas will get really hot if you are hard on them so gently use for a while till they wear in and the whole pad is in full contact the brakes can feel spongy at first for this reason, can take a quite a few miles for bedding in to complete.
Ages since i changed Honda pads but do they have those stainless steel sprung clips that the edges of the pad backing plates sit against rather than the pad edge sliding against the caliper itself...if so ping those clips off and give the caliper and clips themselves a good wire brushing, you might find the pad an easier fit once you've done that, get the same issue on Subarus.
I bed pads in exactly as Ferodo suggest in the link, when you fit new pads to an existing disc only a percentage of each pad will be in contact with the disc at first, those contact areas will get really hot if you are hard on them so gently use for a while till they wear in and the whole pad is in full contact the brakes can feel spongy at first for this reason, can take a quite a few miles for bedding in to complete.
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