Disassembly
Remove brake pads. Clamp the caliper assembly in a soft grip vise.
Disconnect the caliper from the shoe guide.
Clamp the caliper in a vice with pads of soft material and remove the retaining ring of the protective cap.
Remove the dust cap from the caliper.
By blowing a jet of compressed air through the fluid inlet, push the piston out of the cylinder, placing a piece of wood 15-20 mm thick between the caliper and the piston so as not to damage the piston.
Remove the protective cap from the piston.
Using a plastic wedge, remove the O-ring from the groove in the slave cylinder bore in the caliper.
Wash the parts in alcohol or brake fluid and check their condition.
Assembly
Lubricate parts with brake cylinder paste.
Install the protective cap into the piston groove.
Install the O-ring into the groove of the cylinder bore.
Lubricate the piston with a thin layer of brake cylinder paste.
Insert the piston into the bore of the cylinder, without filling it up to the stop.
Insert the dust cap into the groove of the caliper.
Clamp the shoe guide in a soft-grip vise and install the clamping springs.
Put the caliper on the guide pads, compressing the clamping springs.
Check and, if necessary, adjust the position of the piston.
Push the piston all the way into the working cylinder and install the retaining ring and finally seat the protective cap in the caliper groove.
Install brake pads.
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