Hella Gutmann BMA-Tool, User Manual, Page: 20 / 28

Working with the BMA/BMB Tool BMA/BMB-Tool
Checking the wheel brake cylinders for free movement
4. Switch on the pump using the start button (11).
NOTE
The brake fluid reservoir must be filled with brake fluid up
to the marking
MAX
.
Brake fluid flows pressure-free into the brake fluid reservoir.
5. Use the main switch (10) to switch off the pump or BMA/BMB Tool.
5.4 Checking the wheel brake cylinders for free movement
To check the wheel brake cylinders for free movement, proceed as
follows:
1. Connect a suitable adapter for the brake fluid reservoir to the vehicle.
2. Using the pressure regulator (3), set the working pressure to
minimum (see section Adjusting the working pressure (Page 17) ).
3. Attach filler hose to adapter with quick coupling (17).
4. Use the main switch (10) to switch on the BMA/BMB Tool.
5. Switch on the pump using the start button (11).
6. Using the pressure regulator (3), gradually increase the working
pressure to the maximum maintenance pressure approved by the
manufacturer.
7. Turn the wheels to check that the braking effect is the same on all
axles.
If the braking effect varies on the wheels, this may be caused by the
following:
• Wheel brake cylinder or brake calliper stiff or leaking.
• Different settings of the brake shoes in the drum brake.
• Brake shoes or brake linings worn.
• Brake pressure regulator or brake pressure valves faulty.
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