Moto Guzzi V85 TT - Service manual > Component maintenance

• The vehicle is equipped with two-channel ABS. In other words, it works on both the front and rear wheel. Periodically and each time the wheels are remounted, the phonic wheel or the sensor is replaced, it is important to check that the distance is consistent over all 360º. To do this, use a feeler gauge and check the distance between the sensor and the phonic wheel on three points at a distance of 120º.

CAUTION IF THE READINGS SHOULD RETURN A VALUE OUTSIDE OF THE FIELD OF TOLERANCE, REPLACE THE SENSOR AND/OR THE PHONIC WHEEL AND REPEAT THE CHECK IN ORDER TO ENSURE THAT THE VALUES FALL WITHIN THE FIELD OF TOLERANCE.

Characteristic

Distance between tone wheel and front sensor 0.1 - 3.17 mm (0.004 - 0.125 in) Distance between tone wheel and rear sensor 0.1 - 3.10 mm (0.004 - 0.122 in)

CLEANING THE PHONIC WHEELS

• It is important to check that both phonic wheels are always clean. If not: delicately remove any dirt residues using a cloth or wire brush. Do not use solvents or abrasive substances and do not direct air or water jets directly on the phonic wheel.

REPLACING THE PHONIC WHEEL SENSOR

• Disconnect the front phonic wheel sensor connector from the main wiring harness. Unscrew and remove the screws and remove the phonic wheel sensor

CAUTION BEFORE REFITTING, ENSURE THAT THE CONTACT SURFACES BETWEEN THE SENSOR AND THEIR SEATS ARE FREE OF IMPERFECTIONS AND PERFECTLY CLEAN.

ALWAYS CHECK THE DISTANCE BETWEEN THE SENSOR AND THE PHONIC WHEEL.

Removal

• Connect the bleeder bottles to the calliper bleeder screw and open
• Press the lever down as far as it will go and block it in position using a clamping device in order to prevent the liquid from escaping from the system when it is open.
• Close the calliper bleeder screw and remove the bleeder bottle.
• Loosen the two grub screws (1)

• Free the brake calliper line from the cable grommet (2)

• Unscrew and remove the joint screw (3) from the rear calliper
• Unscrew and remove the screws (4)

• Remove the rear calliper (5)

Installing

• Remove the rear brake calliper
• Correctly position the new rear brake calliper (1) on the brake disc

• Insert and tighten the screws (2)
• Position the brake line, insert and tighten the screw (3)

• Hook the brake line into the cable grommet (4)

• Insert and tighten the two grub screws (5)

• Remove the clamp from the brake pedal.
• Remove the brake fluid reservoir cap and fill it with new brake fluid

CAUTION PERFORM THE STANDARD BRAKING SYSTEM BLEEDING PROCEDURE, AS DESCRIBED AT THE END OF THE CHAPTER.

• Top up the fluid reservoir and refit the cap
• Check the stroke and sensitivity of the brake pedal
• If the brake pedal stroke is too long after carrying out the bleeding procedure, check the braking system for leaks and, if none are found, bleed the system using the diagnostic instrument, as described
• Disconnect the flexible bleeder pipes and re-tighten the bleeder screws, applying the correct torque

Removal

The following procedure is described for a single calliper, but is valid for both front brake callipers.

• Connect the bleeder bottles to the calliper bleeder screw and open
• Press the lever down as far as it will go and block it in position using a clamping device in order to prevent the liquid from escaping from the system when it is open.
• Close the calliper bleeder screw and remove the bleeder bottle.
• Unscrew and remove the joint screw (1) from the front calliper
• Unscrew and remove the two screws (2)

• Remove the front brake calliper (3)

Installing

• Remove the front brake calliper
• Correctly position the new front brake calliper (1) on the brake disc

• Insert and tighten the screws (2)
• Position the brake line on the brake calliper and insert and tighten the screw (3)

• Remove the clamp from the front brake lever.
• Remove the brake fluid reservoir cap and fill it with new brake fluid

CAUTION PERFORM THE STANDARD BRAKING SYSTEM BLEEDING PROCEDURE, AS DESCRIBED AT THE END OF THE CHAPTER.

• Top up the fluid reservoir and refit the cap
• Check the stroke and sensitivity of the brake lever
• If the brake lever stroke is too long after carrying out the bleeding procedure, check the braking system for leaks and, if none are found, bleed the system using the diagnostic instrument, as described
• Disconnect the flexible bleeder pipes and re-tighten the bleeder screws, applying the correct torque

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