Wash all parts in ethyl or methanol or clean brake fluid. DO NOT use mineral oils, gasoline, kerosene or carbon tetrachloride to flush brake parts. Blow out all internal channels of parts with compressed air.
Inspect the pistons and bores of the wheel cylinders and brake master cylinder for scoring, wear, or corrosion. Replace the assembly if any of these defects are present. Inspect the calipers and brake cylinders for fluid leaks and wear, and if any defects are found, replace the assembly with a new one.
When reassembling, install only new O-rings. They are usually supplied as a repair kit containing all the parts needed to repair this assembly.
O-rings, even new ones, must be carefully inspected before installation. Ensure that the sealing lips are well formed, concentric with the seal bore, and free of sharp edges, surface defects, or breaks. A seal in any doubt should be discarded, no matter how small the defect may appear.
Prevention of brake fluid loss
If the hydraulic drive parts are disconnected, the fluid will quickly leak out if measures are not taken to prevent it. To prevent fluid loss, it is recommended to seal the top of the brake master cylinder reservoir. For example, the vent hole at the top of the tank cap can be temporarily sealed with plasticine or something similar. In addition, you can remove the cork, close the filler neck of the tank with a piece of plastic wrap and screw the cork on top. After that, the rarefaction of air above the liquid will not allow it to flow out of the disconnected tube.
In addition, you can clamp the disconnected brake hose with a special clamp (rice. A:8). These clamps are available at most automotive supply stores. Plug the fittings of the disconnected brake pipes to prevent fluid from escaping and dirt from entering.
ATTENTION: After completing the work, do not forget to remove the clamps from the hoses and the seal from the master cylinder reservoir.
Brake pipes and hoses
Inspect brake pipes and hoses for corrosion, damage and fluid leaks, replace if defective. If tubes are loose, they may vibrate, resulting in fatigue failure (cracks) tubes. Brake pipes rust especially badly on the side facing the body, so when inspecting them, all dirt should be washed off.
When installing a new tube, do not overtighten the fittings (with a moment of about 1.0 kGm), as excessive tightening will deform the tube flare, which can lead to fluid leakage. To avoid such damage, use only short wrenches when tightening tubing.
Before installing the tube, make sure that both sides of the connection are clean - dirt particles that have entered inside can prevent a reliable connection of the tubes.
After any work related to the disconnection of pipes or hoses, it is necessary to bleed the brake system.
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