Stuttgart996

so i just put new rotors on and used pads that i got off ebay, i only rolled about 10 feet out of the garage hit the brakes then 10 back in and hit the brakes. there is a ring around the rotor now. Is this bad or do the pads need to be broken in with the rotors? Could they be the wrong pads?
let me know i dont want to ruin my new rotors...

future

You should always change the pads when fitting new rotors and the old pads will have bedded into your old discs hence the score ring - Best advice change them now mate.

CarbonRevo

Re-using pads had never made sense to me, for this reason and others.

However, I have installed some, driven roughly 25 miles and had squeeking issues. I pulled them out to check them and when I reinstalled them, I used a wire wheel to re-scuff the pads up so they could re-mate to the discs. No problems since, and even rotor wear.

ryanm6100

Yep there's your problem right there. They weren't from Nize were they?

xsboost90

make sure you didnt put a pad in backwards.

reno808

just put new pads in before you kill your rotors

porshaowner

since the 2 surfaces are not true to each other (used pads, new rotors) there is a good chance that is the only place the pads are touching. if thats the case then they will eventuly seat to each other after a few drives.

future

... Yes and leave nasty groves - The pads will wear the new discs very quickly (Trust me, been there done that and distroyed a new set of rotors myself) so just giving you my expensive experience.

Whilst your at it get some EBC Red or Yellow Stuff Pads - I Run the yellows , they take a few moments to warm up but are dramaticaly better once upto temp and do not create so much brake dust as the OEM and aftermarket products.

It would be a shame to damage those nice new rotors when a set of pads cost next to nothing mate.

CarbonRevo

Does anyone notice more rear dust then front?

My rear pads were fairly new when I got the car back in April, and they only have maybe another 2000 miles left. This is like...less then 7000 miles of driving. They create LOTS of dust.

Any ideas?

lart951

+12345 I have never seen marks like that from used pads, that's scoring actually looks like a groove.

Darwantae951

Check to make sure you don't have "plate lift" in the calipers.

-Darwin

future

CarbonRevo - That is an interesting comment which I have always wondered about... In the UK when the wheather is **** as it is always the rear wheels always get more dirty. This is not brake dust it is from muck being thrown up from the front wheels.

If it is brake dust you have then you need to look at your brake bias - I think it should be 70 front 30 rear from factory but don't quote me on that - I'll leave that to the knowledge pros.

CarbonRevo

How the hell do I check the bias? lol

If I go for a drive, and the wheels get dirty, It will take 3-4 drives to get the front wheels as dirty as the rears geton the 1st drive. It's bad. These pads wore soo quickly.

future

It sounds like you need a caliper rebuild. Our Brembo calipers are the same as used on the Ferrari 348 and are notorious for the pistons sticking - I recon this is your problem and this is easy to check if you remove the pads, take the cape of the brake fluid filler and simply try and push the pistons in with your fingers.

If you can't push them in then a rebuild is what you need - This you can do yourself if competent and get the seals replaced at the same time. I've done this before myself - 6 hours weekend work mate.

Olli Snellman

It's always a good idea to look the condition of calipers when new rotors are installed. Check out the pistons move freely and those stainless guide plates are in OK condition and are not bend. If they are bend, there is a good chance to get pads stuck.