Four disc brakes and EBS
Stralis tractors are fitted with four Knorr SB 7000 ventilated disc brakes with a diameter of 436mm x 45mm, with air activation and Wabco EBS (Electronic Brake System). The driver defines a deceleration value by pressing the brake pedal. The electronic braking control unit modulates the pressure in the brake cylinders of the tractor, activates the engine brake – and the Intarder on the transmission if one is present – and modulates the supply pressure to the semi-trailer brakes, in order to balance the braking effort between the axles. The state of brake wear can be displayed on the control monitor of the instrument panel. The EBS control unit governs ABS (anti-wheel lock when braking), brake effort correction depending on the load, and Active SpaceR (anti-wheel slip) functions.
EBS offers numerous advantages: if the semi-trailer is also fitted with EBS, the braking distance at 85 km/h can be reduced by up to 16 m, the length of four cars; even if the semi-trailer is changed, the braking system on the tractor will adapt automatically to that of the outfit, even if this is of an older generation; wear is distributed uniformly between the axles of the tractor and semi-trailer; the intarder's automatic contribution to the action of the main brake extends the useful life of brake friction parts. For the user, this translates into a considerable saving in maintenance costs.
The Stralis Active Time and Active Day equipped with a Cursor 8 engine have drum brakes at the rear, with EBL (Electronic Brake Limitation) incorporated into the ABS control unit.
The intarders
For extreme cases, Iveco has an optional second generation ZF Intarder on all versions of the Stralis, which offers a wider range of speeds for peak deceleration torque but lower power absorption when idling.
All Cursor engines incorporate the Iveco Turbo Brake, which disperses absorbed energy through the exhaust. In these conditions, the engine cooling system is fully available to disperse the energy absorbed by the Intarder on the transmission. The retarding effect of the two systems can be combined.
