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after more miles, no more vibration for me. After two track days and lots of miles in the Alps, I am really satisfied by the PF08. You can have noise when breaking with low temperatures, but not a big

1 hour ago, geartox said:

I will mount the PF08 pads next Saturday. Do you have a "bedding procedure" (not sure of my english ;-)) for this compound ?

http://www.pfcbrakes.com.au/techtips.php?pageId=18

 

1 hour ago, geartox said:

 

I used this process - it worked fine, but this was on new discs that had no previous transfer layer (of a different pad material, for example):

Whilst bedding, brake applications should be consistent and using constant pedal effort, which is progressively increased throughout the procedure.

  1. 5 light snubs*, light pedal application: 50mph – 30mph
  2. 5 medium snubs, medium pedal application: 70mph – 40mph
  3. 3 hard snubs, hard pedal application (no ABS activation): 100+mph – 30mph**
  4. Cool down period – 5 mile run with very little brake (Do not sit at side of road with foot resting on brakes when hot, this is likely to damage the disc).
  5. Stop and examine discs – discs should show evidence of heat cycle (colouration in flange) and possess an even transfer layer of pad material on surfaces.
  6. Bedding procedure should now be complete.

* Snub is the term used for the deceleration of a vehicle from a relatively high speed to a low speed using constant brake pedal effort.

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  • 2 weeks later...

I have brake noise at low speed. but It's an interesting indicator : noise ? ok I am too slow

I think the bedding period is not yet finished for me, I have vibration at high speed with "medium" "snubs".

 

 

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  • 4 weeks later...

after more miles, no more vibration for me. After two track days and lots of miles in the Alps, I am really satisfied by the PF08. You can have noise when breaking with low temperatures, but not a big deal for me.

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Use them myself 

Stunning in track. Work from cold on the road. Can be a little noisy when cold.

Made some horrendous noises whilst bedding in with additional vibrations for good measure.

The older 01 compound could make a mess of your wheels if bedding in when it was raining ( dust sets like granite) not sure if 08 is the same.

I won't use anything else!!!

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So barring a little noise when cold the 08 compound would be perfectly fine for road use?

So presuming I give the discs a decent going over with some sand paper to remove old brake pad material if I bed in as per procedure detailed above I should be ok. I presume if you do experience a bit of vibration it should disappear with time as the old pad material is completely removed.

Cheers

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I wouldn't bother 'sanding' the disc.......your new pads will do that......

vibration or judder would more than likely due to a slight warp in the disc.......take the disc off and put a straight edge over it.....

if it is then get it turned out......we used to have machine to do this for running all the dyno test on so we could reuse the discs....

a solid disc could warp very easily depending on the pad that was used......its all about dispersing the heat......

if going away from the pad designed for the disc then Id head for a Ferodo DS2500 for street use or the DS1.11 for track use.....

for the latter I wouldn't use them on anything other than the drilled and grooved disc.........

The Faster You Drive...The Slower You Age

(Albert Einstein  14 March 1879 - 18 April 1955)

 

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that's very strange.....

by their very nature theyre already and abrasive........unless its a cross contamination thing...

but a wipe with a solvent and a wash down of the disc should be enough......

 

The Faster You Drive...The Slower You Age

(Albert Einstein  14 March 1879 - 18 April 1955)

 

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there could well be an initial vibration caused by change of material but this should not last more than a couple of uses.....

if in doubt drag the brake whilst driving.......this will not only put a heat cycle through your new pad but will also remove any residual contamination

I worked at Ferodo in R&D and worked on a lot of these compounds aswell as testing competitors products....the dyno rigs were changed as required.......the results never showed any ongoing vibrations...certainly nothing of note.......

we had tested stuff to destruction too........and even had new test materials catch fire........

 

The Faster You Drive...The Slower You Age

(Albert Einstein  14 March 1879 - 18 April 1955)

 

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I drove my car for 40 kilometers with a new set of PFC08. During and after bedding process (about 15 km) there were big noise and vibrations, but they dissapeared after few more miles, may be when pads and discs got cold again. I confess I was a bit worry about those vibrations!

 

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5 hours ago, theelanman said:

there could well be an initial vibration caused by change of material but this should not last more than a couple of uses.....

if in doubt drag the brake whilst driving.......this will not only put a heat cycle through your new pad but will also remove any residual contamination

I worked at Ferodo in R&D and worked on a lot of these compounds aswell as testing competitors products....the dyno rigs were changed as required.......the results never showed any ongoing vibrations...certainly nothing of note.......

we had tested stuff to destruction too........and even had new test materials catch fire........

 

DO NOT I repeat DO NOT drag the brake whilst driving you will glaze the pad. Bed in as per the correct procedure and use them as intended

Drilled discs when used on track always seem to crack....

Remember when using competition pads on the road there will be noise compromises.also you may need to re bed when back at the track to relay the pad transfer material.

Happy to discuss my findings if any one needs help...give me a call

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5 hours ago, theelanman said:

there could well be an initial vibration caused by change of material but this should not last more than a couple of uses.....

 

 

I've had to bin discs on more than one occasion due to uneven pad transfer (not on my Lotus), and believe me I tried everything from "normal" road braking (cold) for hundreds of miles, to all-out thermal assault!

There's a good article here: http://www.stoptech.com/technical-support/technical-white-papers/-warped-brake-disc-and-other-myths

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Erm you drag your brakes every time you use them........unless you try to push your pedal to the floor every time.....and I doubt the stop the rotation immediately or you'd run out of tyres.......

Pads are glazed by being over heated.....if your doing that you've picked the wrong pad

The Faster You Drive...The Slower You Age

(Albert Einstein  14 March 1879 - 18 April 1955)

 

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59 minutes ago, theelanman said:

Erm you drag your brakes every time you use them........unless you try to push your pedal to the floor every time.....and I doubt the stop the rotation immediately or you'd run out of tyres.......

Pads are glazed by being over heated.....if your doing that you've picked the wrong pad

OK you seem to know about this I keep quiet, sorry.

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Dave

Im not disagreeing with your finding....as Im not a track guru......Ive only ever done track days in others cars which have been prep'd for the purpose

I must admit that I personally have never chopped and changed the pad materials on the same disc......

when I have changed the pad manufacturer and material I have also changed the disc

likewise when testing this is not done in a 'working' environment...altho the test rigs will run for 48hrs and replicate everything to the extreme, they never get chance to 'go off'...and are also fresh at the start of each test......

when I refer to dragging I was meaning say rolling up to traffic lights with your foot on the brake....slowing you down gently.....

thanks

G

 

The Faster You Drive...The Slower You Age

(Albert Einstein  14 March 1879 - 18 April 1955)

 

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On 9/28/2016 at 13:39, RedViper said:

So barring a little noise when cold the 08 compound would be perfectly fine for road use?

So presuming I give the discs a decent going over with some sand paper to remove old brake pad material if I bed in as per procedure detailed above I should be ok. I presume if you do experience a bit of vibration it should disappear with time as the old pad material is completely removed.

Cheers

for only "open road usage" I will not use the 08 due to the noise. OEM pads are enough for open road usage in my opinion (at my level :-))

 

 

Edited by geartox
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