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Dual Control Lever 

for Hydraulic Disc Brake

IMPORTANT NOTICE

 

Contact the place of purchase or a distributor for information on 
installation, adjustment, and replacement of the products which are not 
found in the user's manual. A dealer's manual for professional and 
experienced bicycle mechanics is available on our website (https://si.
shimano.com).

For safety, be sure to read this “user's manual” 
thoroughly before use, follow it for correct use, and 
store it so that it can be referenced at any time.

The following instructions must be observed at all times in order to 
prevent personal injury and physical damage to equipment and 
surroundings. The instructions are classified according to the degree of 
danger or damage which may occur if the product is used incorrectly.

DANGER

Failure to follow the instructions will result 
in death or serious injury.

WARNING

Failure to follow the instructions could 
result in death or serious injury.

CAUTION

Failure to follow the instructions could 
cause personal injury or physical damage 
to equipment and surroundings.

Important safety information

  WARNING

 

Because each bicycle may handle slightly differently depending on the 
model, be sure to learn the proper braking technique (including brake 
lever pressure and bicycle control characteristics) and operation of your 
bicycle. Improper use of your bicycle's brake system may result in a loss 
of control or a fall, which could lead to severe injury. 

 

Do not disassemble or modify the product. This may cause the product 
to not operate correctly, and you may suddenly fall and be seriously 
injured.

 

This hydraulic brake system has different braking characteristics from 
those of the rim brake type, demonstrating relatively high braking force 
at the beginning of braking (higher than the rim brake type); 
familiarize yourself sufficiently with the braking characteristics before 
using it. If you ride the bicycle without becoming sufficiently familiar 
with the braking characteristics, braking may cause you to fall off the 
bicycle, potentially causing serious injury or a fatal accident.

 

The braking force for a hydraulic brake system will increase along with 
the size of the disc brake rotor (140 mm, 160 mm, 180 mm, 203 mm).

 

Do not use a 203 mm disc brake rotor. This will excessively increase 
the braking force, which could cause you to lose control of the 
bicycle, fall, and be seriously injured.

 

Only use a 180 mm disc brake rotor if you are unable to obtain 
sufficient braking force with a 160 mm disc brake rotor upon a trial 
ride, such as when riding an electronic assist road bicycle or if the 
rider is heavy. Otherwise, you may lose control of the bicycle, fall, 
and be seriously injured.

 

If you feel that the braking force is too high or too low, stop use and 
consult a place of purchase or a distributor. Accidents or falls may 
occur due to losing control of the bicycle, possibly resulting in serious 
injury.

 

Please use extra caution 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 within the openings of moving 
rotor.

 

Do not touch the calipers or disc brake rotor while riding or 
immediately after dismounting from the bicycle. The calipers and disc 
brake rotor will become hot when the brakes are operated, so you may 
get burned if you touch them.

 

Be careful not to allow any oil or grease to get onto the disc brake rotor 
and brake pads. Riding the bicycle with oil or grease on the disc brake 
rotor and brake pads may prevent the brakes from operating and result 
in serious injury due to a fall or collision.

 

Check the thickness of the brake pads and do not use them if they have 
a thickness of 0.5 mm or less. Doing so may prevent the brakes from 
operating and result in serious injury.

2 mm

0.5 mm

 

Do not use the disc brake rotor if it is cracked or deformed. The disc 
brake rotor may break, and result in serious injury due to a fall. Replace 
the disc brake rotor with a new one.

 

Do not use the disc brake rotor if its thickness is 1.5 mm or less. Also do 
not use it if the aluminum surface becomes visible. The disc brake rotor 
may break, and result in serious injury due to a fall. Replace the disc 
brake rotor with a new one.

 

Do not continuously apply the brakes. Doing so may cause a sudden 
increase in the brake lever stroke, preventing the brakes from operating 
and resulting in serious injury.

 

Do not use the brakes with fluid leaking. Doing so may prevent the 
brakes from operating and result in serious injury.

 

Do not apply the front brake too strongly. If you do so, the front wheel 
may lock and the bicycle may fall forward, and serious injury may result.

 

Because the required braking distance will be longer during wet 
weather, reduce your speed and apply the brakes early and gently. You 
may fall or collide and be seriously injured.

 

A wet road surface may cause tires to lose traction; therefore, to avoid 
this, reduce your speed and apply the brakes early and gently. If the 
tires lose traction, you may fall and be seriously injured.

  CAUTION

 

„

Cautions on SHIMANO genuine mineral oil

 

Use appropriate eye protection when handling, and avoid contact with 
eyes. In the event of eye contact, flush with fresh water and seek 
medical assistance immediately. Contact with eyes may result in 
irritation.

 

Use gloves when handling. In the event of skin contact, wash well with 
soap and water. Contact with skin may cause a rash and discomfort.

 

Cover nose and mouth with a respirator type mask and use in a well 
ventilated area. Inhalation of mineral oil mist or vapors may cause 
nausea.

 

If mineral oil mist or vapor is inhaled, go to an area with fresh air. Cover 
up with a blanket. Stay warm and stable and seek professional medical 
advice immediately.

 

„

Bed-in period

 

Disc brakes have a bed-in period, and the braking force will gradually 
increase as the bed-in period progresses. Accidents or falls may occur 
due to losing control of the bicycle, possibly resulting in serious injury. 
(The same thing will happen when the brake pads or disc brake rotor 
are replaced.)

Notice

 

To prevent noise and ensure the best performance, perform the bed-in 
procedure after replacing the brake pads or disc brake rotor.

 

In the case of carbon levers, wash them with a soft cloth using a neutral 
detergent. Otherwise, the material may be damaged and lose strength.

 

Avoid leaving the carbon levers in places where high temperatures are 
present. Also keep them well away from fire.

 

Be sure to keep turning the crank during lever operation.

 

When the bicycle wheel has been removed, it is recommended that pad 
spacers are installed. Do not depress the brake lever while the wheel is 
removed. If the brake lever is depressed without the pad spacers 
installed, the pistons will protrude further than normal. If that happens, 
consult a place of purchase.

 

Use soapy water and a dry cloth when cleaning and carrying out 
maintenance of the brake system. Do not use commercially available 
brake cleaners or silencing agents. Such substances can cause damage 
to parts such as seals.

 

Also read the user's manuals for the front derailleur, rear derailleur, 
and brake.

 

Products are not guaranteed against natural wear and deterioration 
from normal use and aging.

 

When using ST-RX810-LA, before riding the bicycle, confirm that the 
seat height will not impair the operation of the bicycle (even if the seat 
height has been adjusted within the adjustment range).

 

For maximum performance we highly recommend SHIMANO lubricants 
and maintenance products.

Regular inspections before riding the bicycle

Before riding the bicycle, check the following items. If any problems are 
found, consult your place of purchase or a distributor.

 

Are there any signs of brake oil leakage?

 

Do the front and rear brakes work correctly?

 

Is gear shifting carried out smoothly?

 

Do the pads have a thickness of 0.5 mm or more?

 

Is the disc brake rotor cracked or deformed?

 

Are the levers securely installed to the handlebar?

 

Are there signs of cracks or peeling on the levers?

 

Do any abnormal noises occur during operation?

 

Can the seat post height be adjusted smoothly? (When using ST-RX810-
LA)

Names of parts

 

 

 

Lever

Disc brake rotor

Caliper

Disc brake rotor

Brake hose

Caliper

(Brake lever/seat 
post lever)

Lever
(Brake lever/seat 
post lever)

Front

Rear

Brake pad

Brake hose

Lever A

Lever B

Lever A

Lever B

Lever C

How to operate

 

„

Operating the brakes

 

„

Gear shifting operations

Be sure to keep turning the crank during lever operation.

Caution on operation:

After gear shifting is completed, both levers A and B return to their initial 
position.
Do not push levers A and B at the same time. Gear shifting is not 
performed if the levers are pushed at the same time.

*  Some models have two-step gear shifting.

UM-07X0A-005

User's Manual

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