Shimano BL-TT79 Service Instructions

BL-TT79

* Service Instructions in further languages are available at :

http://techdocs.shimano.com

Please note: specifications are subject to change for improvement without notice. (English)
© Sep. 2010 by Shimano Inc. XBC SZK Pr inted in Japan.

One Holland, Irvine, California 92618, U.S.A. Phone: [phone]

Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: [phone]

3-77 Oimatsu-cho, Sakai-ku, Sakai-shi, Osaka 590-8577, Japan

General Safety Information

CAUTION

Technical Service Instructions

SI-8UV0A-002

• Improper use of your bicycle's brake system may result in a
loss of control or an accident, which could lead to a severe
injury. Because each bicycle may handle differently, be sure to
learn the proper braking technique (including brake lever
pressure and bicycle control characteristics) for your bicycle.
Consult your bicycle dealer and the bicycle's owners manual,
and practice your riding and braking technique.

• If the front brake is applied too strongly, the wheel may lock
and the bicycle may fall forward, and serious injury may result.

• Because of the characteristics of the carbon fiber material, you
must never modify the levers, otherwise the lever may break
and the brakes may no longer work as a result.

• Before riding the bicycle, check that there is no damage such
as carbon fiber peeling or cracking. If there is any damage,
replace with a new part immediately without trying to repair the
damage, otherwise the lever may break and the brakes may no
longer work as a result.

• Obtain and read the service instructions carefully prior to
installing the parts. Loose, worn or damaged parts may cause
the bicycle to fall over and serious injury may occur as a result.
We strongly recommend only using genuine Shimano
replacement parts.

• Read these Technical Service Instructions carefully, and keep
them in a safe place for later reference.

<Points to note about the handlebars>

• Handle inner diameter: 19.0 - 22.5 mm

• Handle outer diameter: 22.2 - 24.0 mm

• Applicable handlebars: Carbon fiber handlebars (with
aluminum inserts where the brake levers are installed) or
aluminum handlebars
* Carbon fiber handlebars without aluminum inserts where the

brake levers are installed cannot be used.

NOTE:

• Use a soft cloth to clean the carbon fiber levers, and be sure to
moisten the cloth with neutral detergent before using it,
otherwise the lever material may become damaged and lose its
strength.

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

• Parts are not guaranteed against natural wear or deterioration
resulting from normal use.

• For maximum performance we highly recommend Shimano
lubricants and maintenance products.

• For any questions regarding methods of handling or
maintenance, please contact the place of purchase.

Brake lever

BL-TT79

In order to realize the best performance, we recommend
that the following combination be used.

Caliper brake

BR-7900

Brake cable

1. Pass the outer casing through the handlebar, and then adjust

its length so that it will fit securely into the outer casing holder
when the brake lever is installed.

2. Install the brake lever to the handlebar by using a 5 mm Allen

key to turn it counterclockwise as shown in the illustration.

Be sure to leave some excess cable, even if cutting it to the full
length of the handlebars.

3. Install the inner cable

<Adjust the lever stroke.>

When installing the components to carbon frame/handle bar
surfaces, verify with the manufacturer of the carbon frame/parts
for their recommendation on tightening torque in order to
prevent over tightening that can cause damage to the carbon
material and/or under tightening that can cause lack of fixing
strength for the components.

Turn the reach adjustment bolt
with a flat-tipped screwdriver
having a tip width of 3mm and a
thickness of 0.5mm.

Be sure to read the service instructions for the Brake
System in conjunction with these service instructions.

Note: The knurled grooves should be

aligned.

Make sure that the inner end is firmly
seated in the cable hook.

Tightening torque:

6 - 8 N·m {52 - 69 in. lbs.}

Installation of the brake lever

Outer casing

Cable hook Inner end

Inner cable

5 mm Allen key

Handlebar

Knurled grooves

Outer holder

SI-8UV0A-002-00