Test brake system with pressure tester for leaks

AR42.10-P-0015EQ

Test brake system with pressure tester for leaks

06.03.2020

Model

293

010

Brake pedal jack

1

Brake booster

2

Brake fluid reservoir

3

Brake caliper

4

Tester

 Caution

Risk of poisoning from swallowing brake fluid. Risk of injury from skin and eye contact with brake fluid

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

Topical note

Notes on repairs to brake system

AH42.00-P-0003-01A

Topical note

Brake fluid notes

AH42.50-P-0001-01A

Topical note

Notes on externally invisible brake fluid loss

AH42.10-P-9406-02A

Notes on safety-relevant components

AH00.00-Z-0019-01A



Check

1

Remove cover over brake fluid reservoir (2).

2

Clean area around cap of brake fluid reservoir (2).

Assembly cleaner

*BR00.45-Z-1028-04A

3

Detach cap of brake fluid reservoir (2).

4

Connect filling unit to brake fluid reservoir (2).



000 588 01 82 00 Filling unit

WS25.00-P-0016B



Brake fluids (DOT 4 plus)

BB00.40-P-0331-00A



General brake fluid

BB00.40-P-0330-01A

5

Raise vehicle.

AR00.60-P-1006A

6

Remove bleed screw from left front brake caliper (3) and connect test equipment (4).



000 588 07 21 00 Test equipment

WS42.00-P-0014B


Test equipment (4) for hydraulic oil systems may not be used for systems with brake fluid.
Otherwise, the brake fluid will be mixed with mineral oil, which can cause brake failure.

7

Bleed test equipment (4) and then switch off.

8

Start engine.

9

Cover brake pedal and driver's seat in area where brake pedal jack (010) is to be fitted.

10

Depress brake pedal and insert brake pedal jack (010) with adapter between brake pedal and driver's seat.

 Adapter for brake pedal winch

*211589003100

 Brake pedal jack

*000589183100

11

Read brake pressure off high-pressure manometer of test equipment (4) and note down.

12

Read brake pressure off high-pressure manometer of test equipment (4) again after the specified test period and compare against previously noted value.

Check values for leak test

*BE42.10-P-1001-19A

If there is a problem,



determine leakage in brake system and repair brake system.

13

Switch off engine and remove brake pedal jack (010) with adapter.

14

Reduce vacuum in brake booster (1) by depressing the brake pedal several times.

15

Depress brake pedal and insert brake pedal jack (010) with adapter between brake pedal and driver's seat.

 Adapter for brake pedal winch

*211589003100

 Brake pedal jack

*000589183100

16

Slowly move brake pedal jack (010) back until low-pressure manometer on test equipment (4) shows specified brake pressure.

Check values for leak test

*BE42.10-P-1001-19A

17

Read brake pressure off high-pressure manometer of test equipment (4) after the specified test period.

Check values for leak test

*BE42.10-P-1001-19A

If there is a problem,



determine leakage in brake system and repair brake system.

18

Remove brake pedal jack (010) and adapter.

19

Disconnect test equipment (4) from brake caliper (3) and screw bleed screw all the way into brake caliper (3).

20

Bleed left front brake caliper (3).

AR42.10-P-0010-02LW

 Bleed screw at brake caliper

*BA42.10-P-1003-10W

21

Lower vehicle.

AR00.60-P-1006A

22

Disconnect filling unit from brake fluid reservoir (2).

23

Correct fluid level in brake fluid reservoir (2).



AP42.10-P-4210F

24

Attach cap to brake fluid reservoir (2).

25

Install cover over brake fluid reservoir (2).

Hydraulic brake system

Number

Designation

Model 293

BE42.10-P-1001-19A

Check values for leak test

High-pressure test

Test period

min

5

Brake pressure loss

%

5

Low-pressure test

Brake pressure

bar

3

Test period

min

2

Brake pressure loss

bar

0

 Front axle brake caliper

Number

Designation

Model 293

BA42.10-P-1003-10W

Bleed screw at brake caliper

Nm

14

Repair materials

Number

Designation

Order number

BR00.45-Z-1028-04A

Assembly cleaner

A 000 986 56 01