Floating Rotors or 1 piece?

Christopher72

Christopher72

Active member
 Ohio
Site Supporter
Front rotors need replaced -- starting to lip, etc. It's a fun driver and not a track car, so are the single piece rotors fine or the OEM 2 piece recommended?
 
The OE are two piece to cope with heat causing different cracking..

They are not floating rotors which have lateral play ..

I wouldn’t on a 35i go with one piece…
 
Christopher72 said:
https://www.bimmerworld.com/Front-2-piece-Floating-Brake-Rotor-OEM-E89-Z4-sDrive35is-E9X-335i.html
https://www.bimmerworld.com/Brakes/...9-Z4-all-except-35is-34116794427-Genuine.html

Looks like there's floating and non-floating 2-piece options.
Click to expand...

Brembo and I would call those 2 piece or composite discs..ie hub in aluminium..rotor in cast iron..held together rigidly together with rivets..

A floating rotor has two pieces but instead of a rivet holding the two parts together it has a bush where the rotor has significant lateral play or float ..

https://www.bremboparts.com/europe/en/products/prime/two-pieces-discs

Refers
 
Thanks for the education. The two options there did look very similar. Whereas a single Brembo that floats cost more than a full set of those rotors. If I had Brembo money, I'd just get a new M4 :)
 
Yes they did …OE BMW one for 35i one not..

Zimmerman offer nice OE quality versions in 2 piece with nice drill holes as an option..

I use them on the rear …I have a 6 pot Brembo upgrade on the front so use different two piece rotors..not floating ..

FWIW the floating ones tend to be very rattley anyway…
 
I did not know the 35i came with 2 piece rotors,maybe only with upgraded front brakes? I swapped mine out already to coated one piece units,but the one I took off were I believe oem and were one piece.
Screenshot_20230406_075437_Gallery.jpgScreenshot_20230406_075515_Gallery.jpg
 
spitfun said:
I did not know the 35i came with 2 piece rotors,maybe only with upgraded front brakes? I swapped mine out already to coated one piece units,but the one I took off were I believe oem and were one piece.
Screenshot_20230406_075437_Gallery.jpgScreenshot_20230406_075515_Gallery.jpg
Click to expand...

On the 35is in all markets the OE fit was the 2 piece unit..

https://www.bimmerworld.com/Front-2-piece-Floating-Brake-Rotor-OEM-E89-Z4-sDrive35is-E9X-335i.html
 
Mine are shot and can't be original at my mileage. They are both lipped and unloved. The Zimmermans 2 piece coated seems like decent replacement.
Any recommendations on low dust pads? Anyone know how bad a set of 90k mile calipers will be? rebuild them for the sake of rebuilding them?
 
Textar who are OE for BMW do ePads which are low(er) dust..I use them on the rear (front now 6 pot brembo) to good effect

https://www.fcpeuro.com/products/bmw-brake-pad-set-textar-epad-2331382#fitment

It wouldn't hurt to get a seal and sliding caliper seal kit for the calipers maybe new pins for the floating caliper part..
 
You must log in or register to reply here.
Back
Top Bottom