Fully Coated Brake Rotors and Ceramic Pads

[DIY4quality]

I'm seeing more brake rotors advertised as partially-coated or semi-coated where the coating is limited to the non-friction surfaces of the rotor. The friction area of the rotor where the pad makes contact is not coated (or is very lightly coated) enabling new pads to bed a little faster.

I'm wondering if this partial coating is also a solution to a problem where ceramic pads get gunked up when bedding a fully coated rotor? I imagine that semi-metallic pads make quick work of the coating and are not a concern. But what about ceramic pads? Is it unwise to pair them with fully coated rotors?

 

[doitmyself]

I don't know the answer, but here is a recent thread that discussed this in detail: https://bobistheoilguy.com/forums/t...pad-contact-surfaces-of-coated-rotors.346614/

 

[UG_Passat]

Ceramic pads do have some grit to them. But.. Centric is a big believer on the semi-coated water-based coatings for its ceramic pads vs fully coated for its semi-metallic pads.

EBC has its "brake-in" layer that is very abrasive for this also, and Centric has a copy of it for its PQ Pro ceramic pads

 

[slacktide_bitog]

I've heard of that, but I never had any problems with Akebono ceramic pads on fully-coated rotors

 

[benjy]

my savy pickey former ducati dealer runs the old pads to clean a new rotor then put the fresh pads on. coating swept areas is a waste + can be a headache IMO

 

[UG_Passat]

But... when you buy what is basically a powder-coated rotor... you don't have to worry about a coating on friction surfaces

But.. Geomet type coatings are the rage right now.

 

[The Critic]

But.. Geomet type coatings are the rage right now.

Chinamet*

 

[Luftmasse]

I've heard of that, but I never had any problems with Akebono ceramic pads on fully-coated rotors

I had problems on a Kia Sedona using Akebonos with Raybestos coated rotors.

 

[Luftmasse]

But... when you buy what is basically a powder-coated rotor... you don't have to worry about a coating on friction surfaces

But.. Geomet type coatings are the rage right now.

I would rather use this.