1. Ensure that the disc reference number corresponds to the vehicle on which it is to be installed.
2. Always replace the two discs on the same axle at the same time.
3. Use two discs from the same pack (this will ensure that they are both from the same production batch).
4. Read and scrupulously comply with the instructions for replacement of discs that are provided in the pack.
5. Replace discs when they show deep scoring, uneven wear or when they have reached the minimum thickness.
6. The minimum thickness value is impressed on every disc (for instance, MIN. TH 10 mm indicates a minimum thickness of 10 mm). It is also to be found in the Brembo catalogue. Generally speaking, a brake disc wears down after 2-3 changes of brake pads.
7. Carefully clean the discs prior to installation; it is absolutely essential that there should be no traces of oil or grease on the braking surfaces. These could contaminate the brake pad friction material and negatively affect braking performance.
8. Once the disc has been installed, use a DTI (Dial Test Indicator), fixed to the suspension strut, in order to measure the run-out of the disc on a braking surface near to the outer edge. The runout value after one complete turn of the wheel must not exceed 0.1 mm. If the value is greater, change the position of the disc in relation to the wheel hub (if the tightening hole allows) or install as above the second disc from the pack. If the disc is held in place by means of a single bolt, attach it to the wheel hub with two more bolts (using the wheel nuts with spacers corresponding to the thickness of the rims) in order to simulate the rotation conditions once the wheel has been fitted. Measurement of disc run-out is an extremely important operation: if run-out is excessive, in due course after a few thousand kilometres the disc may be affected by abnormal wear when the vehicle is not being braked (due to partial contact with the brake pads) and during braking there will be vibrations. The maximum tolerance for run-out once the disc has been installed as indicated by Brembo has been determined on the basis of experience. Certain manufacturers may indicate slightly different values. In such cases the original values should be followed.
9. Advise a short running in period for new discs (about 200 Km); during this period a short, smooth braking action should be used so that the brake pad surfaces can adapt to the disc. Over sharp or heavy braking action could cause the brake pad friction material and disc to overheat and in time this would compromise the braking system as a whole and its performance.
10. The brake disc and brake pad are important sources of information (state of surface, colour, appearance). Any change in the condition could indicate failure or wear of one or more parts of the axle (caliper, hub, bearings, etc.).