Remove/install brake booster vacuum sensor

AR43.10-P-0352MEX

Remove/install brake booster vacuum sensor

27.11.2019

Model

451.390/490

Shown on MODEL 451.490 with CODE V03 (Battery cooling system)

1

Bolts

5

Nut

9

Clip remover

2

Bolts

6

Bracket for vacuum sensors

B64/2

Brake vacuum sensor 1

3

Front axle carrier support

7

Electrical connector

B64/3

Brake vacuum sensor 2

4

High-voltage battery circuit heat exchanger (only for CODE V03 (Battery cooling system))

8

Electrical connector

 Danger

Risk of death when working on component parts and systems with U >= 30 V alternating voltage (AC) or U >= 60 V direct voltage (DC)

Do not touch damaged or defective live component parts and lines or non-insulated electrical connections and lines.

AS00.00-Z-0035-01A

Topical note

General information on handling vehicles with high-voltage on-board electrical system and/or lithium-ion battery and/or gaseous-fuel drive system

AH00.00-Z-0300-01A

Topical note

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

Topical note

Notes on battery

AH54.10-P-0001-01A

 

Remove/install

1

Remove transmitter key and mains plug

2

Push down brake pedal several times

 To reduce any vacuum.

 Danger

Risk of death caused by vehicle slipping or toppling off of the lifting platform.

Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer.

AS00.00-Z-0010-01A

3

Raise vehicle with vehicle lift

4

Unscrew high-voltage battery circuit heat exchanger (4)

Model 451.390/490 with engine 780.993
with code V03 (Battery cooling system)

AR20.00-P-0210MEX

 Refrigerant lines and coolant hoses can remain connected.

5

Remove front underfloor paneling

6

Remove bolts (1)

 Bolt, support, front axle carrier to front axle carrier

*BA33.10-P-1002-01D

7

Remove screws (2)

 Bolt, support, front axle carrier to body

*BA33.10-P-1003-01D

8

Pull the front axle carrier support (3) down until the brake vacuum sensor 1 (B64/2) and brake vacuum sensor 2 (B64/3) are accessible

9

Unscrew nut (5) on vacuum sensor bracket (6) and remove vacuum sensor bracket (6)

 The vacuum sensor bracket (6) is integrated in the brake booster vacuum line.

10

Release and disconnect electrical connectors (7, 8)

11

Push out brake vacuum sensor 1 (B64/2) and brake vacuum sensor 2 (B64/3) out of the vacuum sensor bracket (6) using clip remover (9)


Ensure that the brake vacuum sensor 1 (B64/2) and the brake vacuum sensor 2 (B64/3) are pushed completely into the seals of the vacuum sensor bracket (6).
Otherwise, it could lead to leakage, thus causing damage to the brake system.

  Position clip remover (9) between brake vacuum sensor 1 (B64/2) or brake vacuum sensor 2 (B64/3) and vacuum sensor bracket (6) (arrow).

 Clip remover

*452589016300

12

Install in the reverse order

 Front axle carrier

Number

Designation

Model 451.390/392/490/492

BA33.10-P-1002-01D

Bolt, support, front axle carrier to front axle carrier

Nm

20

 Front axle carrier

Number

Designation

Model 451.390/392/490/492

BA33.10-P-1003-01D

Bolt, support, front axle carrier to body

Nm

20