400 – Front Axle, Anti-Roll Bar, Dampers and Steering
Version 1 2016-01-01 59 / 113
local overheating on the disc and subsequent distortion on it. The heat
transferred into the disc becomes however higher (high gradient of
temperature) toward the end of the bedding because the disc surface is now
completely and uniformly settled up and the friction efficiency optimized, at this
point no risk of uneven heat distribution and distortion should exist.
Step 3
After the constant pressure brakings and the subsequent layer formation (step
2) a series of #4 - 5 high deceleration stops are desirable in order to set up the
layer and guarantee a correct functioning. To ensure that the bedding has been
done properly a homogenous, dark and slightly shiny layer must cover the
rubbing surfaces of the discs (the observation of the external surface is enough).
Darker stains are allowed and close to the fixing of the disc there may be visible
purple colored areas (indicating spike temperatures above 550 °C, see picture).
Narrow grooves (imperceptible to touch) are admitted, they will not affect the
performance in use. If the disc is too bright the bedding is not completely
finished, and a second and shorter procedure must be done. Pad appearance
should not indicate any mutation except a higher polishing of rubbing surfaces,
too rough surfaces (cracks, crumbling, detachment) could be caused by an
erroneous bedding, with too high thermal gradients.
* A simple way to check the correct temperature after bedding is to use thermo-
paints that turn white when the temperature is reached. Brembo offers a kit
including 3 paints: red up to 630 °, orange 550 ° and green 430 °C (p.n.
02.5711.10).
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