A3.19 Checking
service brakes for wear
Checking service brakes for wear
At the intervals indicated in the Maintenance Schedule, check the state of wear of the brake pads and
discs.
Remove the wheels (
D2.01
).
Remove all.
The front brake pads are fitted with a wear indicator connected to the brake failure warning light on the
instrument panel. Should this warning light illuminate, check the thickness of the pads and the state of
the braking surfaces on the discs.
In the event of excessive wear, even of just one pad, replace all the pads on the axle.
Checking and inspecting the brake discs
The brake discs must be perfectly clean, free of any oil, grease or rust, and must not be excessively scored.
In the event of poor braking performance not attributable to the state of the brake pads and callipers, carry
out a series of dimensional checks on the discs.
Using a dial gauge, measure the planarity with the disc fitted on the wheel hub.
Using a micrometer, measure the parallelism between the contact surfaces and the pads at different points
on the braking surface.
Using the special tool, check the roughness of the pad contact surface.
The rear discs differ from the front discs in that they have two additional holes to enable access to the
brake shoe adjustment pin without removing the disc.
They also have a large friction surface on the inner side for the parking brake.
Checking CCM brake disc wear
This operation includes:
visually inspecting for alterations in the brake disc friction surface;
checking the minimum brake disc thickness (maximum permitted wear
0.5 mm
);
checking the brake disc edges for damage (damage caused by improper use).
The brake discs must be replaced if:
there are significant alterations in the friction surface;
the brake discs are worn beyond the minimum required thickness (material abraded).
Normally, both forms of brake disc wear occur simultaneously. Only rarely, following prolonged stress on
the race track with large temperature variations on the friction surface, surface alteration may become
so pronounced as to necessitate earlier replacement of the brake discs.
Summary of Contents for California
Page 19: ...Z Tyre type and pressure label ...
Page 20: ...04 02 Assembly number Assembly number A Assembly number label ...
Page 21: ...04 03 Chassis number Chassis number B Punched chassis number ...
Page 22: ...04 04 Engine type and number Engine type and number C Punched engine type and number ...
Page 23: ...04 05 Chassis number Chassis number D Chassis number ...
Page 24: ...04 06 Gearbox type and number Gearbox type and number E Gearbox type and number plate ...
Page 25: ...04 07 Vehicle identification Vehicle identification K VIN label Vehicle Identification Number ...
Page 28: ...04 10 Fuel Fuel I Fuel label ...
Page 29: ...04 11 Paintwork Paintwork L Paintwork label ...
Page 30: ...04 12 Emissions control Emissions control M Emissions control data label ...
Page 31: ...04 13 Airbag Airbag N Do not install child seat on passenger seat label ...
Page 32: ...04 14 Airbag Airbag O Airbag maintenance label ...
Page 33: ...04 15 Airbag Airbag P Airbag warning label ...
Page 43: ...Fluids and lubricants table Model Fluids and lubricants table Download ...
Page 71: ...Screw the cap A back on tightly ...
Page 104: ...Connect the battery F2 01 ...
Page 118: ...Vehicle Setup Parameter Check Form Model Vehicle Setup Parameter Check Form Download ...
Page 520: ...A DCT gearbox clutch oil tank and clutch oil pump B Clutch oil pipes C Clutch oil radiator ...
Page 623: ...CCM Brake Disc Wear Form Model All Models CCM Brake Disc Wear Form Download ...
Page 1070: ...A Horn button B Engine start button C Manettino ...
Page 1102: ...Perform the respective cycle with the DEIS diagnostic tester ...
Page 1144: ...Connect the battery F2 01 ...
Page 1220: ...Precautions and guidelines for using the RHT retractable hard top ...
Page 1334: ...Undo the indicated fasteners Retrieve the indicated shims Release the clip 1 ...
Page 1335: ...Remove the indicated clip Undo the indicated screw Undo the screws indicated ...
Page 1452: ...Refit the rear wheelhouses E3 05 Connect the battery F2 01 ...
Page 1453: ...F2 07 Lights Diagnosing condensation in headlamps ...
Page 1561: ...Ss Sensor signal λ Lambda ratio excess g Rich mixture M Lean mixture ...
Page 1570: ...Refit the DCT gearbox C2 03 Connect the battery F2 01 ...
Page 1656: ...G Heater evaporator H Pollen filter I Air vents M Expansion valve ...
Page 1677: ...Refit the front wheelhouses E3 05 ...
Page 1686: ...Refit the caps 1 Refit the engine compartment cosmetic shields E3 13 ...