vdubpower

so after 38000 miles my front right side ( i think) is squeeking like crazy when braking...

no pad sensors have come up on the dash

braking seems ok, not bad i guess

what is the size in thickness of the OE new disc and pads and what is considered a thickness needed to replace them

id like to change pads only if needed , i dont want to get ripped off by a dealer telling me i need rotors if i dont...

thanks guys

herpderp

As long as the car isn't pulling to either side, your brakes should be okay.

I might suggest having someone do a brake service to clean up the pads. This should fix the squeak. I have 6k kms on my car and my brakes are squeaking as well. I'm gonna have my indy shop take a look at them and service the pads if needed.

It all depends on how worn the rotors are and if they are still within spec and not warped if they need to be replaced or not.

hope this helps.

vdubpower

cool... i dont feel any lips or grooves..
any one know what "spec" numbers may be..i want to measure myself before i go in to dealer

2012 merc amg

When I do tires on my car which is once every couple of years I have them blow the caliper area out with a high pressure air hose and check the pads (firestone) since they have the wheels off anyhow. I generally pay them a little extra to clean the inside of the rims too. Last I checked last summer I was about 1/2 worn on the pads and that was around 40K miles, it all depends on how you drive as far as brake wear goes, I do a lot of highways and leave most of the nannies off so my pads last a long time.

ProfessorX

Mercedes will always tell you that you need both pads and rotors.

robl45

36mm is the rotor thickness assuming it hasn't changed from my 2011.

Davidkuo0330

If your 2012 is still under warranty, have the dealer check to wear on both the break pads and rotors, they will tell you what's up.

V. From the sound of your car, I got 8 out of 9 from my pads, get the Rado pads if you need replacement.

TonyC

*sigh* the squeaking is most likely caused by brake dust, just like "most" high performance brake systems. dealership checked my car, the pads are brand new, the rotors are well within parameters, but they were all like: new pads! I'm like: NO BIIISH.

i'm too lazy to R&R the brake pads (shims, new anti-squeal paste, etc.)

vdubpower

yeah ill take the wheels off the weekend and do a cleaning and see what happens ...

HPMan

Applicable service limits should be stamped on the rotors, so if you are taking your wheels off, just measure the thickness of the rotors and compare to the stated service limits.

vdubpower

So I did an inspection of my pads and rotors today. The min thickness up front is 33mm. I'm not sure I measured this right though. The circumference of the disc has a band around it so when I measure u don't actually get on the disc. You'll see in the pictures.

Also a few pics of the pads. Can't really tell the size thickness very well.

robl45

There is no band around them from what I know, thats the lip from your rotors wearing down. I had a guy tell me the rotors could be turned and reused. I told him they wee at minimum thickness and he kind of laughed and said "yea, if you racing on the autobahn" This is after I told him how much the brakes were and it was double what he thought they would be. Can't imagine he would turn down the profit. My old C6 vette didn't have 2 piece rotors and I can guarantee a heck of a lot more people are dragging those to the track then 4000 pound AMG E63's.

vdubpower

When I mean band. I mean where the numbers are stamped right. That is actually thicker than the flat surface so it doesn't let the caliper get a correct measurements. I wonder how dealers or service guys do it

2012 CCB E63

This is the correct tool to measure brake rotors

vdubpower

well gosh darn it that makes sense...back to harbor freight i go

vdubpower

oh and is it normal for when a car is off for the pad to look like it is touching the disc....on my front pad there it looked like it to me...and even turning the rotor you can kinda hear a little rub with a little resistance

2012 CCB E63

yup 100% normal

If the pad was far away from the rotor, then when you went to press on the brake pedal, you would have a lot of travel in the pedal (it would feel as if you didn't have any resistance/pedal would go towards the floor with ease) before the pads touched the rotor.

2012 CCB E63

You want this then, http://www.harborfreight.com/6-in-lo...per-60248.html

vdubpower

Just bought it. Need to fit it thru wheels to try to measure lol.

robl45

As far as I know, the band is flat with the rotor when it starts, that would explain the 36mm you are getting at the band which is supposed to be the thickness of a new rotor.

vdubpower

car is in shop for the suspension issue, but ill check with the new caliper with wheels off when i get it back

i know the jokers at service just eyeball it before they tell you need new pads rotors according to my SA

robl45

I saw some new rotor pics. There is no edge on new ones. They start out completely flat.

2012 merc amg

What happens is the pad does not quite cover the whole disc on the mercedes and then the outside of the rotor gets a lip as all of the rotor wears but the outside, normal. Most other cars the pads cover all the way to the outer edge of the rotor and this does not happen, not sure why MB does this.

robl45

I just looked at the pics again. You are either at min thickness or will be before new pads are up. That lip looks bigger than mine and mine are just about at min thickness

GreggT

So......what are the specs for OE original rotor thickness F & R..........and what is min. spec for replacement F&R ?........in my case for 2001 E55 but assume any AMG of that general vintage. Thanks in advance.