Remove/check/install front axle brake pads

AR42.10-P-1600RR

Remove/check/install front axle brake pads

13.1.10

10.8.05

Brake pad thickness, wear limit (with
pad backing plate) at maintenance service

Type 452.3/4

*BE42.10-P-1001-05E



Checking

1

Check the lining thickness of the brake pads (5) and condition of the brake disks

*BE42.10-P-1001-05E

*BE42.10-P-1001-08E

 If the brake pads (5) are worn down beyond the permissible wear limit, the web between the sealing groove and dust boot (9) may be damaged, for this reason:

Check brake system for leaks

AR42.10-P-0100-01RR

 

Remove/install

 Danger!

Risk of poisoning caused by swallowing brake fluid. Risk of injury caused by brake fluid coming into contact with skin and eyes

Only pour brake fluid into suitable and appropriately marked containers. Wear protective clothing and eye protection when handling brake fluid.

AS42.50-Z-0001-01A



Brake fluid notes

All models

AH42.50-P-0001-01A



Notes on repairs to brake system

All models

AH42.00-P-0003-01A

2

Remove front wheels

AR40.10-P-1100RR

3

Unscrew bolt (2) on brake caliper (1) at the top

When loosening the screw (2), counterhold the bolt (4) using a suitable fork wrench.



*BA42.10-P-1001-03C

4

Fold down brake caliper (1)

 Installation: When folding up the brake caliper (1), ensure that the springs (3) of brake pads (5) are clamped under the brake caliper (1).

5

Check bellows (6) for damage

 If the upper bellows are damaged (6) they should be replaced, if the lower bellows (6) are damaged the complete brake caliper (1) should be replaced.

 Installation: Ensure that the bellows (6) are seated correctly.

The lip at the bellows (6) must fit correctly in the groove at the corresponding pin (4).

6

Take out brake pads (5)

 Do not press the brake pedal when the brake pads (5) are removed, otherwise the brake piston (8) will be pressed out of the brake caliper (1).

Observe installation position of brake pads (5).

7

Clean contact surfaces (arrows) of brake pads (5) in housing shaft (7).

8

Check the upper and lower pins (4)

 Check the ease of movement of the upper and lower pin (4), if the pin (4) is notchy or difficult to move the brake caliper (1) should be replaced otherwise there is the risk of uneven brake effect.

9

Press back brake piston (8).

The fluid level in the brake fluid reservoir rises when the brake piston (8) is pushed back. Ensure that the reservoir does not overflow. It must be possible to move the brake piston (8) easily.

 Brake piston resetting device

*450589023700

10

Check the leaktightness of the dust boot (9) on the brake piston (8)

11

Apply brake paste to the contact surfaces (arrows) on the housing shaft (7) and brake pads (5).

 Installation: Coat with a thin and even layer of brake paste, otherwise the brake effect is impaired

Molykote 111 grease

*BR00.45-Z-1070-06A

12

Install in the reverse order

 Danger!

Risk of accident when commissioning the vehicle due to a lack of braking effect when the service brake is operated for the first time after repair work

Before starting engine, actuate brake pedal several times until the pressure is built up and maintained in the brake system.

AS42.50-Z-0002-01A

13

Operate the brake pedal several times until the brake pads (5) contact the brake disks

 A firm resistance must be noticeable.

14

Check the brake fluid level in the brake fluid
reservoir and correct if necessary.

 Top up or extract brake fluid until it is at "MAX" marking on brake fluid reservoir.

15

Check brake system for leaks

AR42.10-P-0100-01RR

Number

Designation

Models 452.3/4

BE42.10-P-1001-05E

Brake pad thickness

New (with pad backing plate)

mm

15

Wear limit (without pad backing plate) for maintenance service

mm

2

Wear limit (with pad backing plate) for maintenance service

mm

7,7

Response of wear indicator (with pad backing plate)

mm

7,7

Number

Designation

Models452.3/4

BE42.10-P-1001-08E

Brake disk thickness

New

mm

9

Wear limit

mm

8

Number

Designation

Models 452.3/4

BA42.10-P-1001-03C

Guide pin to caliper support

Nm

32

Number

Designation

Order number

BR00.45-Z-1070-06A

Molykote 111 grease

Q0014759V000000000