BEDDING IN

For optimal use of any given brake system, the pads and rotor have to be compatible with each other. The bed-in procedure establishes that compatibility between the pad and rotor. This is achieved by a combination of rubbing speed, temperature, line pressure, and Inertia. Bed-in is also influenced by pad and rotor material chemistries. It is always recommended that only compatible pads and rotors be used in any given application.

Bedding in advantages:

  1. Gradually heat treats the rotor and eliminates any thermal shock in the rotor.
  2. Burn off volatiles and moisture from the resin that is on or near the pad surface. This will eliminate green fade.
  3. Establish a layer of transfer film about a few microns thick on the rotor surface. Shearing of the film during friction is an effective source of friction force. Otherwise, when using a freshly ground rotor without the transfer film, the main friction force would come from cutting, plowing, or scoring the microscopic surface elevations due to surface roughness of a material on the rotor surface. This leads to inconsistent braking effectiveness.
  4. Mate the two surfaces to a near perfect geometrical match, so that the contact area is high, and therefore the friction force is increased.
  5. The performance of a fresh rotor / fresh pad system is inconsistent. This is due to ever-changing structures and properties of the two mating materials. Bed-in of pads and rotor will form a stable transfer film.
If the bedding in procedure is not followed, a stable transfer film may take a long time to be established or it may never be created. Until a stable transfer film is created, the brakes performance is decreased and wear is increased.

Recommended bedding in procedure

  1. Make 6-10 slow-downs from approximately 50 kmph to 5 kmph. applying moderate pressure. Do not come to a complete stop.
  2. Make an additional 2 to 3 harder stops from approximately 70 kmph. to zero.
  3. DO NOT DRAG THE BRAKES! (after stopping - do not leave your foot on the brake pedal)
  4. Allow 15 minutes or more for the brake system to cool down.
  5. Your new pads are ready for use.
  6. For the first 100 kilometers after the bedding procedure it is recommended that you do 5 second braking i.e. Try and give yourself enough braking distance. Apply the brake pedal with moderate pressure for 5 seconds and release then reapply until vehicle stops completely.