PF brake discs - are they really any good!?

[shimmy]

will check for imbalance but i think they are fine

just been overused on track and very hard worked,

so far a front set lasts me a year and i wouldnt mind betting everytime they have been under minimum thickness

all in all each set does about 2100 track miles plus a load or road miles i between

I tend to swap them out as soon as i notice any cracks that go to the outer edge of the disc - seems to work so far

[glendog74]

AP discs usually crack - just hairline fractures at first which get worse over time/usage. Quite normal - to a degree...

[CT1]

I just had to say something Shimmy your discs are bad........
Reading the thread your are all talking about pad and disc wear. I think the cracks are caused by overheating the components and is not good err very dangerous can cause exploding disc with obvious consequences....

I google searched this artical about overheating discs:

"Cracked Discs

Braking surface cracks are seen as radial cracks appearing in the braking surface and rounding the edge of the disc at the inside or outside diameter of the braking surface.
These cracks are always caused by excessive heat which is usually caused by torque imbalance which shifts a greater share of the braking function to only a few of the vehicle brakes. The brakes which are providing a greater share of the braking action, will always be the ones to show the greater disc wear and will sometimes crack.
Cracked discs must always be replaced. If the disc is not replaced the cracks will gradually get worse and can eventually progress into the barrel section. After the discs are replaced the braking system should be checked for proper balance."

Interesting reading...someone has already mentioned inbalance from front to rear so not entirley overlooked.

By the way wheels are great eventually fitted new Kumhos, the ride is not to bad just have to drive round those pot holes.:supz:

[shimmy]

Come round the Ring with me next time...

nah, gotta leave you the King of somewhere









Anyway it scares me too much









And I promised mself and the wife I wouldn't



Ohhh, go on then

[glendog74]

at the speed you go youd be happy with cheese ( just a splodge of your KY)

:hahaha: :hahaha: I'm more than happy with my speed at Spa - i have no records to try and beat. I also don't love it quite as much as you clearly do!

Come round the Ring with me next time...

[shimmy]

I'm more than happy with stopping power and longevity of discs/pads using the AP/RS29 combo.

But then i only weigh a third of Shimmy's mass... :whistle: :blalalala:

at the speed you go youd be happy with cheese ( just a splodge of your KY)

[glendog74]

RS29 doesn't stop the car as well - look at the friction graphs! I always thought with RS19 \ RS29 you were trading outright stopping power for disk and pad life.

I'm more than happy with stopping power and longevity of discs/pads using the AP/RS29 combo.

But then i only weigh a third of Shimmy's mass... :whistle: :blalalala:

[shimmy]

Anyway 2 years ago it was still my daily driver, only been caged for a year and a quarter :birdman:

excuse me, im just a sore looser!:thumbs:

[_Nathan_]

PMSL :bigcry:

Give me money and I'll go racing :whistle:

Anyway 2 years ago it was still my daily driver, only been caged for a year and a quarter :birdman:

[shimmy]

:hahaha::thumbs::smt055

your car seems to be very good on pad life

2 years/one set!

[_Nathan_]

:hahaha::thumbs::smt055

[shimmy]

yep

just found the Pagid paper that says that RS19/29 were developed from RS14 and "give a reduction in friction level and longer pad and disc life!!"

So my PF discs have done ok then :thumbs::hahaha:

And i was angling for PF to send me some new ones as a trial :banghead:

I may just try then rear RS29 pads next to see how it affects balance, not that i have been having any issues (always been ok at late braking) but will be interesting

[_Nathan_]

RS29 doesn't stop the car as well - look at the friction graphs! I always thought with RS19 \ RS29 you were trading outright stopping power for disk and pad life.

[shimmy]

I still think RS29 are kinder to disks :P

you may be right........

but theefore you are saying the RS29 wears slower and the disc wears slower and it stops the car as well or better - something doesnt add up!

[glendog74]

I still think RS29 are kinder to disks :P

What he said ^^^ :whistle: