When can you "bed" the brakes?

[Nuclearjack]

I got new rear rotors and pads today. When can I bed the brakes?

Should I wait a few days/kms before I try it?

[CUEBALL]

Do it now, before you get uneven deposits.

Here's some links:
Instructions for bedding in your brakes

[Jabroni]

Yep, go for it ASAP.

[MADDOG`]

Do It Now! Stop and go or repeated stops can create hot spots in new brakes but if you season the rotors and bed the pads, no worries.

[Rambit]

You can also do it again any time you get judder or squeal returning. It won't hurt and if it doesn't make things better at least you can rule uneven deposits out.

Bernie

[MADDOG`]

One other item of note...Baer suggests about a week of normal driving, avoiding if you can high speed stops or panic stops.

Here's an excerpt from their How To Section:

Seasoning Procedure:

Before you begin, please note: The following represents the minimum recommended, “Seasoning” process. If your situation offers any opportunity to perform gentle preliminary “Seasoning” outlined in Step 2 below for a longer period of time, this will
generally render even better performance and increase further long-term rotor life. Use the vehicle for 5 to 6 days of gentle driving. Use the brakes to the same extent that you used the stock brakes, DO NOT TEST PERFORMANCE or ATTEMPT HEAVY USE UNTIL ALL ITEMS OUTLINED HAVE BEEN COMPLETED. It is imperative that excessive heat is not put into the rotors at this stage. They need temperature-cycling to relieve the internal stresses.

Regarding new pads:

Bedding The Pads - (NEVER DRAG the brakes)
Note: Never “Bed” pads on rotors, which have not first been “Seasoned.” Always allow a substantial coast down zone when bedding pads that will allow you to safely drive the car to a stop in the event of fade.

Their How To Knowledge Base can be found here:

Baer Brake Systems -- Braking 202: "How-To Guides" -- Performance you can See!

Hope this helps!!!