Maintenance Manual STEMME S10
Date of Issue: Oct. 01, 1990 page: 40-1
Amendment No.: 19 Date: Jan. 10, 2014
A4010021_B19.doc
Doc.No.: A40-10-021
Refilling and Ventilation of Hydraulic Brake System (TOST Brake System)
• Refill with brake fluid DOT 4.
• Install transparent flexible hose and drain bottle at the three venting ports of the parking brake valve and
at the left and right brake calliper
• Open the venting valve of the parking brake valve.
• Refill brake fluid by plastic injection nozzle to the brake fluid reservoir in landing gear bay (use sealed
adapter) until the brake fluid passing through the transparent flexible hose at the parking brake valve is
free of bubbles. If required release/remove RH brake lever and slightly swing with upside down attitude.
• Close venting valve at the parking brake valve.
• Open venting valve at the LH brake calliper.
• With continuous refilling of brake fluid to the brake fluid reservoir as required pump the brake fluid
through the hydraulic brake system by operation of the RH brake lever until the brake fluid passing
through the transparent flexible hose at the venting valve of the LH brake calliper is free of bubbles. If
required release/remove LH brake lever and slightly swing in upside down attitude.
• Close venting valve at the LH brake calliper.
• Open venting valve at the RH brake calliper.
• With continuous refilling of brake fluid to the brake fluid reservoir as required pump the brake fluid
through the hydraulic brake system by operation of the RH brake lever until the brake fluid passing
through the transparent flexible hose at the venting valve of the RH brake calliper is free of bubbles.
• Close venting valve at the RH brake calliper.
• Operate LH and RH brake lever for inspection.
=> A clear pressure point has to identifiable during operation! Otherwise repeat ventilation procedure!
• Reinstall brake lever (if applicable).
• Remove transparent flexible hose and check final brake fluid level at brake fluid reservoir.
• Perform functional check of brake system with pre-flight check according Flight Manual, Ch. 4
Adjustment and Ventilation of the Wheel Brake System (Hydromechanical Brake System):
The brakes (actuating lever on the control stick) can be adjusted via bowden cable ends above the brake
master cylinder (in the wheel well).
If the break efficiency remains poor, the hydraulic system should be bled:
− Prior to venting, the brake fluid tank should be filled completely (use brake fluid DOT4).
− Attach a transparent hose (D
i
= .24 in./6 mm) on the nipple of the vent screw on the wheel brake jaws.
The other end of the hose is to be directed into a glass container filled with brake fluid to such a level that
the hose end dips into the fluid.
− Then actuate the brakes and at the same time briefly open and close the vent screw by means of a
spanner (width .4 in./10 mm). During this phase, brake fluid and air will escape. This procedure is to be
repeated until only brake fluid escapes. The procedure is to be repeated until only break fluid escapes.
The procedure is to be performed on both wheels. Make sure that the brake fluid level does not fall below
the minimum level mark of the fluid tank.
The same procedure is to be applied for replacement of the brake fluid.
Replacement of Brake Linings
The wheel brake jaws are provided with brake linings to the right and to the left side of the brake disc.
For replacement of the brake linings, the brake jaws can be removed after loosening of both 1/4" screws.
Warning: Do not actuate the brake now. The pads with the riveted brake lining can now be replaced by
new ones.
The linings must be replaced at the latest shortly before the attachment rivets are exposed.
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