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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 (
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.
D2.01).
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