Checking brake system for leaks with pressure tester

AR42.10-L-0015VA

Checking brake system for leaks with pressure tester

30.3.01



Checking



Notes if loss of brake fluid is not visible externally

AH42.10-P-9406-02A

1

Remove left front wheel

AP40.10-P-4050Z

2

Unscrew brake bleed valve on left front floating caliper and connect pressure tester (2)


 Pressure testers for hydraulic oil systems must not be used for systems with brake fluid otherwise the brake fluid will be mixed with mineral oil, which can result in a failure of the brake system.

*WH58.30-Z-1012-15A

 After testing, only bleed the floating caliper to which the pressure tester (2) was connected.

AR42.10-L-0010VA



*BA42.10-P-1003-03B

3

Bleed pressure tester (2)

 Refer to the operating instructions for the tester.



High-pressure test

4

Run engine at moderate speed then create as great a vacuum as possible by suddenly releasing the accelerator pedal

 The vacuum reaches the brake booster through the vacuum line (1).

5

Depress brake pedal as far as possible with the brake pedal winch (3)



 A suitable block of wood must be used to support it against the seat frame.

*000589183100

 During the test period of 5 min. the pressure drop must not be greater than

5 % of the set value.



Low-pressure test

6

Switch off engine and depress brake pedal several times until the vacuum in the brake booster is dispersed (brakes become hard)

7

Turn back brake pedal winch (3) until a line pressure of approx. 3 bar is still indicated on the pressure gauge

 The line pressure must not fall during the test duration of 2 minutes.

Number

Designation

Model 414

BA42.10-P-1003-03B

Brake bleed valve to floating caliper

with O-ring

Nm

10

without O-ring

Nm

-

Number

Designation

WH58.30-Z-1012-15A

Pressure tester (hydraulic single / dual circuit brake systems)