Shimano GRX RX 815 Series Dealer's Manual page 12

TO ENSURE SAFETY
• If the road surface is wet, the tires will skid more easily. If the tires skid, you may fall off
the bicycle; therefore, to avoid this, reduce your speed and apply the brakes early and
gently.
„ Hydraulic disc brake
• Please make sure to keep your fingers away from the
rotating disc brake rotor. The disc brake rotor is sharp
enough to inflict severe injury to your fingers if caught in
the openings of the disc brake rotor while it is moving.
• The calipers and disc brake rotor will become hot when the brakes are operated; do not
touch them while riding or immediately after dismounting from the bicycle. Otherwise,
you may get burned.
• Be careful not to allow any oil or grease to get onto the disc brake rotor and brake pads.
Otherwise, the brakes may not work correctly.
• If any oil or grease does get on the brake pads, you should consult a place of purchase or
a distributor. Otherwise, the brakes may not work correctly.
• If noise occurs during brake operation, the brake pads may
have been worn down to the usable limit. Check that the
brake system temperature has cooled down sufficiently,
and then check the thickness of the brake pad. If the
thickness is 0.5 mm or less, the brake pad needs to be
replaced with a new one. Consult a place of purchase or a
distributor.
• If the disc brake rotor is cracked or deformed, immediately stop using the brakes and
consult a place of purchase or a distributor.
• If the disc brake rotor becomes worn down to a thickness of 1.5 mm or less, or if the
aluminum surface appears, immediately stop using the brakes and consult a place of
purchase or a distributor. The disc brake rotor may break, and you may fall off the
bicycle.
• Vapor lock may occur if the brakes are applied continuously; therefore, please refrain
from doing this.
Vapor lock occurs when the oil inside the brake system becomes heated, which causes
the water or air bubbles inside the brake system to expand. This can then result in a
sudden increase in the brake lever stroke.
• The disc brake is not designed to work when the bicycle is upside down. If the bicycle is
turned upside down or on its side, the brake may not work correctly, and a serious
accident could occur. Before riding the bicycle, be sure to depress the brake lever a few
times to check that the brakes operate normally. If the brakes do not operate normally,
stop using the brakes and consult a place of purchase or a distributor.
12
2 mm 0.5 mm