DG Flugzeugbau DG-500M Maintenance Manual - Page 13

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Fill the first syringe again, open the bleeder valve and fill in further

brake-fluid. Look at the reservoir while filling to see if air bubbles are

coming out of the line. Fill up to 15 mm (0.6 in.) below the upper edge

of the reservoir.

Close the bleeder valve, reinstall the membrane and the cap to the

reservoir and remove the bleeder assy.

Check brake pressure according to step 3..

Reinstall the main wheel.

3. Check brake pressure:

Extend the airbrakes, there must be a strong pressure when the wheel

brake engages.

Check several times, the wheel brake must engage at the same point

every time

If this is not the case, you have to bleed the system again, see step 5..

4. Check the hydraulic brake system for leaks:

Extend the airbrakes with high force and hold it in this position for 2

minutes.

Then check the whole hydraulic system visually for leaks. If necessary

tighten the screwed joints or replace the sealings and bleed the system

again.

Note: The adjustment of the length of the cable between the master cylinder and

the airbrake control shaft restricts the max. airbrake extension height. The

adjustment of this cable should be done with the glider rigged.

5. Bleeding the hydraulic brake system

Remove the brake fluid from the reservoir using the syringe.

Then execute again steps 2 and 3 of this instruction.

6. Exchanging brake fluid (every 4 years)

Perform preparations (see step 1.) of this instruction. It is not

necessary to remove the main wheel.

Fill the system with new brake fluid (see step 2.). To accomplish this

remove all brake fluid from the reservoir first with the second syringe.

Used brake fluid is darker than new brake fluid and can easily be

identified. Watch the reservoir while filling to see when the new fluid

streams into the reservoir. Repeat the filling process until only new

fluid is in the system and no air bubbles can be detected.

Perform steps 3. and 4. of this instruction.

Issued: September 2011

Manual valid with the up-to-date cover page only

Maintenance Manual DG-500M

TN500/05

4.6