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8 | BFX-20 | Operation
3.
Operation
3.1
Removing brake fluid from reservoir
t
The brake fluid exchange unit has a suction function for the
content of the master cylinder reservoir. A filter is installed in
the suction hose to keep large dirt particles away from pump.
1. Make sure the waste fluid bottle is empty and connected.
2. Unscrew lid of master cylinder reservoir.
3. Press switch 4 (Fig. 2) to ON position to turn on suction pump.
4. Hold the suction hose in the opening of the brake fluid master
cylinder reservoir and remove the brake fluid.
5. Press switch 4 (Fig. 2) to OFF position to turn off suction pump.
6. Dispose of the waste brake fluid as indicated in the safety data
sheet for the brake fluid.
3.2
Brake fluid exchange
y
The safety instructions in the section "Safety Regulations"
must be strictly observed.
y
Before starting service, please observe the vehicle manufac-
turer's instructions about the maximum filling pressure and
specific working instructions.
In principle, for every type of vehicle, the instructions and
y
guidelines stipulated by the manufacturer for the bleeding of
the brake system shall always apply.
t
The factory setting of the pressure control is a working pres-
sure of 2 bar. This ensures that the brake fluid master cylinder
reservoir is not deformed and that there are no leaks at the
bleeders. A lower or higher working pressure can be set on
the pressure adjustment valve.
© MAHLE
1. Install the adapter included onto the opening of the brake
fluid master cylinder.
2. Connect the fill hose to the previously mounted adapter.
3. Power on the brake fluid exchange unit with switch 3.
4. Press the START button (2) and hold it until the pressure has
reached at least 0.5 bar. The operating pressure (max. 3.5
bar) can be adjusted to the desired operating pressure using
the pressure control .
5. Check the master cylinder reservoir as to whether the adapter
is connected properly and is leak-tight. If brake fluid escapes,
switch off the brake fluid exchange unit immediately and find
out the cause.
6. Now bleed the brakes one after the other beginning with the
back right and ending with the front left brake. To do so, open
the valve on each wheel brake cylinder. Collect the old brake
fluid in the collecting bottle. The valve can be closed again
as soon as the new brake fluid escapes from the drain hole
bubble-free.
7. Turn off the brake fluid exchange unit by pressing switch 3.
8. Check the pressure gauge to see if the pressure has fallen.
9. Note: The brake fluid exchange unit usually decreases the ex-
isting pressure. However, if the pressure was reduced during
the filling process, the pressure will still remain in the system.
The pressure adjustment valve must first be released of pres-
sure. To do so, turn the pressure adjustment to the right after
switching off until the point of release has been reached. The
working pressure falls to 0 bar.
10. Disconnect the pressure-free fill hose from the adapter.
11. The brake fluid master cylinder reservoir is now full to the top.
Use the suction function to lower fluid level to MAX fill line.
m
If after the bleeding process or after changing brake fluid the
pedal actuation on the brake or clutch pedal is too long, or the
build up of pressure is too "soft", the braking or clutch system
must be bled again after powerfully activating the brake or
clutch several times.
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