Disc Inspection - VESPA 633844 IT Service Manual

Vespa GTV 250 i.e.
Removal
- Remove the rear brake calliper.
- Remove the brake disc and the hub from the
wheel axle
- To remove the brake disc from the hub, hold the
unit firmly with a vice and operate on the 5 fixing
screws indicated in the photograph
Refitting
- To reassemble the brake disc on the hub, carry out the removal operations in the reverse order ar-
ranging the brake disc on the hub on the side opposite the wheel keying
- Follow the direction of rotation shown by the arrow and tighten to the prescribed torque.
- Fit the hub unit
- disc in the wheel axle
Locking torques (N*m)
Disk to the hub 11 ÷ 13 Nm

Disc Inspection

- Remove the rear brake calliper.
- Check the disc thickness with a micrometer
Characteristic
Minimum thickness allowed after use:
3.5 mm
Standard thickness:
4 +0.2-0.2 mm
- Repeat the measurement at no fewer than six points on the disc.
- Check the regular nature of the rotation of the brake disc assembly using the appropriate tool fixed
onto the brake calliper as shown in the photo.
- In order to be able to anchor the appropriate tool properly use a metal plate with M8 threaded hole
and fix it to one of the two rear brake calliper attachment points.
- Suitably fix the flange to the wheel axle with the original nut and spacer and a Æ 17 mm bearing.
N.B.
SO AS NOT TO GET A DISTORTED READING, CAUSE THE DRIVEN PULLEY SHAFT TO TURN
IN ORDER TO ROTATE THE DISC.
Specific tooling
020335Y Magnetic support for dial gauge
Braking system
BRAK SYS - 7