threeMBs

I am looking into "upgrading" my GLE43's rear solid rotors (which are 330x22, p/n I believe to be 1664230112, replaced by p/n 1664230600) to cross drilled Mercedes OEM 330mm rotors.
My research shows that 2012-13 ML550/350 with P31 "AMG" package were equipped with 330mm cross drilled rotors, p/n 1664230412. So there is a Mercedes 330mm cross drilled rotor p/n that was fitted to W166. When looking at cross section sketches of both 1664230112 and 1664230412, I do not see any differences - all numbers are the exact match.
Did anyone by chance try to and has successfully fitted cross drilled OEM Mercedes 330mm rear rotors without any modifications?

(I know Power Stop has rear 330x22 rear cross drilled rotors for non-63AMG W166 ML/GLE, p/n EBR1453XPR.)

whitewagon

looking for this info also... When I bought our 43 last year, dealer replaced all 4 sets of pads, rotors anf tires...I questioned whether the solid rotors were correct on AMG model.

Looked at Power Stop, but don't need rotors for a while

kajtek1

Drilled rotors help a lot when you do frequent power stops from speeds above 130 mph. At lower speeds all they do is accelerate brakes wear.
How often you do that?

whitewagon

actually not really concerned about brake pad wear... changing pads is easy abs not very expensive
I trail a boat and can put a bit more wear on braking system and need heat dissipation and as an AMG (light) model, wondered why fronts were drilled but rears are solid...

suspect with all the tech in these cars using brakes, Solid rotors were a reasonable compromise by Mercedes

threeMBs

Brembo has 330mm rear cross drilled rotors, which they reference only to those "specially" P31 equipped 2012/13 ML550s (and maybe 350s?), but not to the rest of non-AMG63 W166 lineup. Brembo p/n is 09.A959.21.

Strangely, Brembo has no reference for rear GLE43 rotors at all, only to the front 375mm rotors. So I'm kind of stuck since MB dealers are of no help since they go strictly by "the book".

When looking at cross section sketches of both 330mm solid rotor p/n 1664230112 (Brembo p/n 09.A959.11) and 330mm cross drilled rotor p/n 1664230412 (Brembo p/n 09.A959.21), I do not see any differences - all numbers are the exact match.

Kein Ersatz

subscribed

Kein Ersatz

I "track" another German brand car (hint starts with a P). Cross drilled are standard autobahn ready - have upgraded to slotted rotors and track pads for more performance. Would think as long as they are the correct diameter / thickness for calipers, they will "work". Unanswered question, will they be better (stop, wear, etc). A lot of time when changing rotors is done with a more performance pad which will not last as log and or use up rotors faster. If trailer has electric brakes, not thinking changing out stock AMG rotors will buy you much. Modern pads are pretty amazing, first upgrade should be high temp brake fluid if concerned with brake performance, preventing fluid boiling on track cars is the first upgrade. would think the same would hold true for towing.

Also, stability and cruise control will use up the rears as much if not faster than the fronts.

threeMBs

This discussion is starting to drift from its intended purpose. Desire to replace GLE43 rear solid rotors to cross drilled is not related to tracking, better stoping (agree pad replacement is a better root), rear pads wear or towing.
I am 100% convinced that cross drilled rear rotors (everything else being equal) will not degrade nor improve stock brake performance, other than wet braking as water has easier way to escape. I want to do it mostly for appearance without sacrificing stock brake performance (IMHO stock GLE43 brake performance has already room to improve).
If 2012-13 W166 ML550s were equipped with cross drilled rear rotors, why did MB discontinued them for 2014 ML550 and did not use them for GLE43? All W166 ML550s and GLE43s use identical p/n front rotors, why not the rears for 2014 ML550 and 2016-19 GLE43?
I remember that there were a lot of rotors warping issues around 2012 MY for ML550 and E550 (different rotors, I know), so this might be the reason, but it is a pure speculation on my part since I do not have data to support it, since warping was both front and rear rotors. What is interesting is that Brembo "follows" MB line with its cross drilled rear rotors only for 2012-13 ML550, but Power Stop "allows" its cross drilled rear rotors (same p/n) for both ML550s and GLE43s.
Would be great to hear from someone (if there's anyone that is) who has actually done it vs. pro/against arguments.