维修手册英文版

Maintaining Guide Manual

of the Air Disc Brake

Content

CATALOGUE

1. Summarize

2. Maintaining description

2.1 Safety briefing during maintaining

2.2 Breaking function check

2.2.1 Clearance check

2.2.2 Adjuster check

2.3 Brake pads check

2.4 Rotor check

3. Brake pads replacement

4. Brake replacement

5. Dust cap replacement

5.1 Dust cap & bushing replacement

5.2 Screw dust cap replacement

6. Rotor check/replacement

6.1 Rotor check

6.2 Rotor replacement

7. Brake chamber replacement

7.1 Brake chamber removal

7.2 Brake chamber installation

8. Adjuster replacement

9. Troubleshooting

10. Exploded view

11. List of mounting & maintaining tools

Brief introduction of YOUFIN

YOUFIN was established on May 20th, 1998. It is a Sino-Foreign joint-venture

enterprise registered in Wuhan Economic and Technological Development Zone

with multi-investors among which private investors dominate. It is a professional

company engaged in manufacturing disc brakes and serving the principal

automobile manufacturers by providing modularized supply. The main products

cover hydraulic disc brakes and air disk brakes in close to thirty sizes.

YOUFIN developed the air disc brake autonomously and patented the product.

So far we are the only manufacturer in China that can mass produce air discs to be

used in long distance coaches and inner city buses. It is evaluated that the quality

of our products is close to the advanced international level in field use. The product

development is part of the National Torch Plan and is also sponsored by the Small

and Medium-sized Enterprise Technical Innovation Foundation of Chinese Ministry

of S&T.

Our Air Disc Brake products are on an absolute leading position in China and

the same international level as far as the key technology is concerned.

1. Summarize

YOUFIN Air Disc Brake has four sizes (16’’, 17.5’’ 19.5’’, 22.5’’). It can satisfy

different vehicles. The brakes have compact structure; automatically wear

compensation and can easily changing the brake pad.

2. Maintaining description

Safety briefing during maintaining

It’s most important to ensure safety driving and breaking by good characteristics of the brake.

Observe brake pad and rotor wear limits. When they warned already to

assigned smallest thickness, it need replace immediately, otherwise, it may cause the accident. The pads scorches, grinds or greases must replace immediately.

Every pad on each bridge must replace at the same time.

When services the brake, the vehicle must park in smooth gound and the wheel

withstand with the block/ stone prevent rolls.

Note:

 Must guarantee it does not occur with careless brake. When replace brake

pad don’t make the brake, otherwise, it will hurts the body!

 Do not use the compressed air or other cleaning up equipment clean the

brake, in order to avoid injures the body.

 Be sure your hands and fingers place outside the caliper, in order to avoid injures the body.

 When moves and installs the brake should have some assistance, avoids it

too heavy to hurts the body.

 When take off the brake to make maintenance, it must fix on the clamp with

high strength bolt, in order to avoid hurts the body.

 Only allowed genuine YOUFIN kits and pads permitted by YOUFIN. During

the first 50 miles driving after new pad replacement, should avoid promptly

brake and brake at a long distance, Prevent overhigh temperature.

 Allowed genuine YOUFIN kits and brake pads permitted by YOUFIN.

 Only can use the recommendation kits in service. Screws the bolt/nut according to the request moment of force.

Brake Function check

Clearance check

Process:

 Take off the hexagon bolt (39), loosen the pad retainer (38).

 Remove pad retainer (38) from caliper.

 Remove 3pcs of pad clip (37).

 Move the cable (40) to the side.

 Push the caliper towards the wheel and check the clearance with tune-up gauge.

0.5mm ≤ clearance ≤ 1.2mm

Note: Insert tune-up gauge between the caliper (1) and the brake pad (35). Should

check the adjuster while the clearance is out of standard.

Adjuster check

Process:

 Remove the rubber cap (12).

 Turn hexagon head (22) clockwise by wrench to ensure clearance larger than

3mm. (Or remove the brake pad and the push board) Note: