The GT kit components list is given below: each pair of boxes contains all the components necessary for one vehicle axle. Some parts of the kit are directional and must be assembled on the correct side of the vehicle. These parts are packed separately in the 2 boxes with identification of the reference side:
- The rolling diameter of the wheel should correspond to the value defined by the vehicle manufacturer,
- If large tyres are used, ensure that there are no impediments to rotation in all vehicle operating conditions
Failure to observe these preliminary recommendations can result in incorrect reading of the vehicle speed or, at worst, serious damage to the structure of the tyres and therefore risks in terms of vehicle stability. Due to the greater overall dimensions of disc and caliper, it may be necessary to use different rims or spacers.
Disc rotation direction
It is a common error to assume that the rotation direction of the disc is determined by the slots or the holes. For a ventilated disc, the rotation direction is determined by the geometry of the fins. Three types of ventilation are used:
- Straight fin
- Curved fins
The first two are not directional and can be used on both sides of the vehicle. The discs with curved fins are directional. A disc with curved fins must be installed with the fins facing backwards, from the internal to the external diameter, in the direction of rotation. Positioning of the disc as above provides a centrifugal effect. Rotation of the disc creates a current of air from the centre of the disc, through the ventilation channel towards the outside, considerably increasing the heat dissipation capacity of the disc.
All the Brembo slotted discs are directional, regardless of the geometry of the ventilation fins. The discs should be installed so that the slot edges nearest the outer edge of the disc come into contact first with the pad.
Positioning the caliper
The Brembo calipers are directional and suitable precautions are taken during manufacture to avoid abnormal wear on the pads. The caliper bears a small arrow indicating the disc rotation direction. Once installed in the vehicle, the bleed screw will be in the upper part of the caliper.
To join composite discs, Brembo uses floating drive elements. The disc assembly system allows for a certain amount of play in both the radial and axial directions. Brembo has developed special springs which, when used in the drive elements, are designed to slightly pre-charge the assembled part. This prevents excessive noise being produced by the braking system. These springs can be found on all the drive elements or in alternating sequence according to specific application needs. Bushes without springs can move slightly in an axial direction; this is a fundamental requirement. The drive element tightening screws are tightened to an appropriate torque during the assembly process and must not be tightened any further or loosened for any reason.
The Brembo braking system pads are high quality and guarantee constant performance at the various temperatures. The pads are effective both at low temperatures and at the high temperatures reached during road racing. For the use of alternative friction materials, you are advised to contact Brembo for suggestions. The GT system pads can be without wear indicator. Periodic inspection of the pads is recommended to prevent damage to the disc due to excess wear on the pads.
The pads are worn out when the friction material reaches a thickness of 2 mm.
Lifting the vehicle
1. Slightly loosen the vehicle screws or nuts before lifting the vehicle.
2. Lift the vehicle carefully using the lifting points indicated in the vehicle manufacturer’s manual.
3. Prop the vehicle by means of supports, following the vehicle manufacturer’s recommendations.
4. Remove the wheel
DANGER! Check that the vehicle is raised in a safe stable manner; if not, it could fall from the supports causing possible injury and damage.
DANGER! You are advised not to rely on the hydraulic jack to support the vehicle during the assembly and disassembly operations. Failure to observe the vehicle manufacturer’s directions for lifting and supporting can lead to serious accidents, death and/or material damage.
Bypassing the wear indicator
CAUTION! This procedure applies only to vehicles equipped with electric wear indicator. If your vehicle does not have an electric wear indicator, go on to the point “Removing the original components”.