Brakes poor after changing pads

StarCruiser May 8, 2019

  1. StarCruiser

    StarCruiser Well-Known Member Supporter Guru I am in uk

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    It’s a good point though I had the lot apart a year or so back and refurbed them. I don’t suppose they would have degraded in that time…would they?
     
  2. Jake the Peg

    Jake the Peg Well-Known Member I am in scotland

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    I wouldn’t expect so soon, take one pad out at a time and get someone to to press the brake pedal, you should see the pistons move out at a similar speed, at least that will rule out the calipers

    Cheers
     
  3. StarCruiser

    StarCruiser Well-Known Member Supporter Guru I am in uk

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    Hmm, that’s certainly worth trying. Good thought, thanks. :thumbup:
     
  4. Dave 2000

    Dave 2000 Well-Known Member Supporter I am in spain

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    Glad the sponginess has gone as expected, the materials used in brake pads/shoes varies from one manufacturer to another. Harder materials take longer to bed in, last longer but need higher pedal pressure and are harder on the disc faces, they can also be more inclined to squeal, the 80 is not known for brake pad longevity so harder pads may help in this area?

    Softer pads bed in quickly, are easy on the pedal giving better retardation for less effort and easier on the discs to boot however, they do not last as long and fade earlier. The bevel presents less surface area to the disc face to help with the increased pedal pressure, you might want to spend some time and try to get used to them, in particular if your discs have wear and will need replacing at the next pad change?

    Regards

    Dave
     
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  5. StarCruiser

    StarCruiser Well-Known Member Supporter Guru I am in uk

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    Thanks Dave, discs are about 5 years old now and have minimal wear, so I won’t be looking at changing them any time soon.

    I think the crux of the matter, for me at least, is that the pads have changed design if not composition since last time I used them. To the point where I’ve got one set bevelled and one set not in the same parcel from Milners.

    I had no issue with the ones I’ve just replaced from Milners hence getting another two sets in. When I get time I’ll swap for the non bevelled set and see if I can feel any difference though unless the truck goes on a brake tester this is going to be somewhat subjective.

    I still think that having 30% less brake pad surface due to bevelling (yes it is really that much) is going to give 30% less braking force.
     
  6. frank rabbets

    frank rabbets Well-Known Member

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    PSI is increased on the disc with same pedal pressure though Richard? a bit complicated to work out.
     
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  7. StarCruiser

    StarCruiser Well-Known Member Supporter Guru I am in uk

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    Hadn’t thought of that Frank, obvious with hindsight (isn’t everything?). There must come a point though when brake material x pad pressure works out at less braking force?

    Like you say, complicated! :)
     
  8. frank rabbets

    frank rabbets Well-Known Member

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    Yes I don't think it would be a straight line graph.
     
  9. flint

    flint Well-Known Member Supporter

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