New brakes squealing??
Discussion
75 miles ago I put new brakes on the front of my CRV. (Discs and pads)
There is quite a lot of squealing on harder braking, is this generally acceptable? They were Napa pads and Unipart discs.
I put new anti-rattle shims in too and used the supplied lubricant in the shims for the pads to rest into. No lubricant on the backs of the pads though.
Is there anything else I can do to quieten them down? Could it just be due to more affordable parts?
Cheers
There is quite a lot of squealing on harder braking, is this generally acceptable? They were Napa pads and Unipart discs.
I put new anti-rattle shims in too and used the supplied lubricant in the shims for the pads to rest into. No lubricant on the backs of the pads though.
Is there anything else I can do to quieten them down? Could it just be due to more affordable parts?
Cheers
Squealing brakes can be a nightmare to solve. It is caused when the static co-efficient of friction exceeds the dynamic co-efficient of friction causing something which can move (pad, shim, caliper) to 'start-and-stop' very quickly and go into a harmonic resonance - a squeal. When I had competition pads in the rally Mini many moons ago, they could summon the hounds from hell at 2am when I came back into our street.
To cure it - if it is unbearable - you could try the opposite of what you already have, i.e. if it has shims, take them out and try it. If something is lubricated, clean it off and try it. If the pads are a tight fit in the caliper, scrape some rusty bits off the caliper bracket to increase clearance.
Anything might work, sod's law says nothing will work but it will disappear of its own accord as and when it sees fit!
To cure it - if it is unbearable - you could try the opposite of what you already have, i.e. if it has shims, take them out and try it. If something is lubricated, clean it off and try it. If the pads are a tight fit in the caliper, scrape some rusty bits off the caliper bracket to increase clearance.
Anything might work, sod's law says nothing will work but it will disappear of its own accord as and when it sees fit!
littleredrooster said:
Squealing brakes can be a nightmare to solve. It is caused when the static co-efficient of friction exceeds the dynamic co-efficient of friction causing something which can move (pad, shim, caliper) to 'start-and-stop' very quickly and go into a harmonic resonance - a squeal. When I had competition pads in the rally Mini many moons ago, they could summon the hounds from hell at 2am when I came back into our street.
To cure it - if it is unbearable - you could try the opposite of what you already have, i.e. if it has shims, take them out and try it. If something is lubricated, clean it off and try it. If the pads are a tight fit in the caliper, scrape some rusty bits off the caliper bracket to increase clearance.
Anything might work, sod's law says nothing will work but it will disappear of its own accord as and when it sees fit!
Thanks for that!To cure it - if it is unbearable - you could try the opposite of what you already have, i.e. if it has shims, take them out and try it. If something is lubricated, clean it off and try it. If the pads are a tight fit in the caliper, scrape some rusty bits off the caliper bracket to increase clearance.
Anything might work, sod's law says nothing will work but it will disappear of its own accord as and when it sees fit!
I'm going to give the caliper bracket a wire brush as the pads were definitely more snug to get in than I'd usually expect.
If all else fails, I can live with it, it still brakes as expected.
If they were snug as you’ve said, I’d also check the contact surfaces on the pads where they mate with the caliper brackets.
Any poorly finished edges or lips from the backplates being made may well be holding the pads in place enough to have caused them to heat and glaze.
Knocking any bits like that down with a file and a quick dress of the pad face might help.
Any poorly finished edges or lips from the backplates being made may well be holding the pads in place enough to have caused them to heat and glaze.
Knocking any bits like that down with a file and a quick dress of the pad face might help.
Demelitia said:
If they were snug as you’ve said, I’d also check the contact surfaces on the pads where they mate with the caliper brackets.
Any poorly finished edges or lips from the backplates being made may well be holding the pads in place enough to have caused them to heat and glaze.
Knocking any bits like that down with a file and a quick dress of the pad face might help.
I'll take everything back out and check it all. The older shims that were in there were very old and one was snapped, so I imagine the bracket has a good amount of rust where the shims clip in, so I'll give it all a wire brush and clean up.Any poorly finished edges or lips from the backplates being made may well be holding the pads in place enough to have caused them to heat and glaze.
Knocking any bits like that down with a file and a quick dress of the pad face might help.
It is odd, the pads don't seem to squeal on every journey, they were silent this morning.
I keep thinking one wheel is slightly warmer than the other, but really they both feel the same level of warmth.
On a side note, Honda caliper pins have one solid one and one with a notch at the bottom with a little rubber bushing type thing that slots over it. The one that came out didn't have this bushing on (was last taken out 2 years ago). The new pin I put in, with the rubber bushing on was quite stiff to get it in because of the width of the rubber bushing, as such that pin doesn't move as freely as the top pin. It still moves, but just needs a bit more effort.
Can I remove this bushing? I read it was an anti-rattle bushing.
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