DG Flugzeugbau DG-800A, Руководство по обслуживанию, Страница: 65 / 163

Maintenance Manual DG-808C
Issued: June 2005 4.4
4.4.4 Filling and bleeding the hydraulic disc brake (Option)
Caution: Filling and bleeding the system has to be done from the lowest point
which is the brake cylinder assembly at the wheel. Otherwise the system can’t
be bled completely.
Necessary tools:
1. 1 open-end wrench 1/4" = 6.35 mm for the bleeder valve at the cylinder
assy..
2. 1 open-end wrench 11/16" = 18 mm.
3. 1 Plastic syringe acid resistant, volume ca. 100 ml (6 cu.in.). Use this
syringe for brake fluid only!
4. 1 bleeder assy. Tost No. 075890.
5. 1 m (3 ft.) transparent PVC hose inside diameter 3 mm (0.12 in.), fixed to
syringe and bleeder assy. with hose clamps.
6. Instead of items 3 –5 we recommend to use the Tost No. 059010 filler assy.
For hydraulic disc breaks including 075890 bleeder.
7. Brake-fluid DOT 3, DOT 4 or SAEJ 1703.
1. Preparations
- raise the fuselage, extend the landing gear
- fix left wheel door in the fully open position
- set the airbrake control in the retracted position
- remove the baggage compartment floor and rear cover. Remove the reservoir
mounting plate. Check that the actuating cable for the master cylinder is
loose and if the piston rod of the master cylinder is at its stop.
- Remove the mounting bolts of the main brake cylinder. Lift the cylinder so
far that the cylinder comes to a higher position than the highest point of the
brake hose. Hold the cylinder in this position for filling.
2. Filling
- remove the cover of the reservoir including the gasket.
- fill the syringe with brake fluid, therefore screw off the black part of the
bleeder assy., eliminate all air bubbles, reassemble the black part.
- remove the protection cap from the bleeder valve, attach the bleeder assy.
and fix it with the wrench 11/16".
- open the bleeder valve at the cylinder assy., use the 1/4" wrench, fill in
slowly the complete volume avoiding air bubbles.
- fill the complete system up to 15 mm (0.6 in.) above the lower edge of the
reservoir.