1. Replacement of the chain cover assembly should only be undertaken to replace a damaged chain cover or wear sensor – if there are any signs of water ingress then the complete caliper should be replaced.

exclamation2 Identify the type of sensor by the electrical connectors – only replace with the same type. MEI ‘universal’ chain covers are also available to accommodate either screw type or clip type connectors.

 

idoo idlinear idss  Chain 4 300 Chain 5 300 
 On/Off - Silver Pins + White Circle  Linear - Silver Pins  Stepped - Gold Pins  Screw Type Clip Type

Clean any dirt from around the plastic chain cover to be replaced and remove the electrical connector, being careful that nothing falls into the air chamber pushrod aperture.

MEI chain covers with sensors are supplied pre-set in the correct position however the caliper pistons need to be set to match this – it is recommended that this is done with the brake removed from the vehicle.

 

2. Adjust the tappets using a 10mm ring spanner or socket wrench on the adjuster until a setting gap ‘P’ (see table) is achieved between right hand piston and outboard pad abutment face – do not exceed 25 Nm torque.

5B1400 top web   ...

Caliper Variant +

Chain Cover Variant

Setting

Gap (P)

Voltage

(Ref. Only)

   
  LB195, LB225 or LC225
+ Plain Type Chain Cover
105 ± 0.25 mm n/a    
  LB195 or LB225
+ Silver Pins + White Circle
105 ± 0.25 mm 0.15 V    
  LB195 or LB225
+ Silver Pins
105 ± 0.25 mm 1.0 V    
  LB195 or LB225
+ Gold Pins
105 ± 0.25 mm 0.7 V    
  LA225 or LV225
+ Silver Pins + White Circle
110 ± 0.25 mm 0.15 V    
  LA225 or LV225
+ Silver Pins
110 ± 0.25 mm 1.0 V    

MEI chain covers with sensors are supplied pre-set at the correct voltage, but if required the voltage can be checked using the MEI Wear Sensor Tester (ref. 5K2010).

With the chain cover mounting face uppermost remove the chain cover assembly to be replaced by loosening the 7 screws using a 4mm A/F hexagon drive and lift the cover away from the chain.

5B1400 chain weba

 

exclamation2

Do not disturb the synchronisation of the chain and sprockets.

 

3. With the chain cover mounting face uppermost, clean the sealing interface on the caliper housing by wiping radially away from the chain with a clean cloth, being careful not to get any dirt into the screw holes. If necessary re-align the chain to match the profiled channel in the underside of the plastic chain cover.

Chain 3 web  Chain 2 web 

Locate the small plastic wear sensor drive adaptor (where applicable) in the end of the secondary adjuster shaft.

Position the new chain cover assembly, with the adjuster cap removed, over the chain and sprockets and lower it into place to align the wear sensor with the drive adaptor (where applicable) and the 7 screws with the threaded holes. Gently rotate the adjuster drive by hand, by no more than 15 degrees in either direction, to ensure it locates over the adjuster shaft and the chain, and the chain cover gasket comes into full contact with the caliper housing.

Loosely wind down the 7 screws using a 4mm A/F hexagon drive. Tighten the screws to 5 - 6 Nm torque in the numbered sequence (1-7) shown.

Chain 1 web

4. Refit the brake to the vehicle. Replace the pads and re-set the running clearance by turning the adjuster clockwise until the pads come into contact with the disc – do not exceed 25 Nm torque – then turn back the adjuster 3 clicks and check the pad-to-disc running clearance.

Chain 6 web ... Chain 7 web

 

 5. Replace the adjuster cap.

Chain 8b web

Refit the electrical connector to the chain cover.

Torque  ...  Chain 4 300 ...  Chain 5 300
     Screw Type   Clip Type

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