Pic. 15–19. Front caliper FN-3: 1 - protective cap; 2 - guide pin, 25 Nm; 3 - bleed valve; 4 - protective cover; 5 - support; 6 - spring; 7 - bushing; 8 - caliper holder; 9 - sealing ring; 10 - piston; 11 - protective cover
Details of the front caliper FN-3 are shown in fig. 15–19.
Clean the caliper of dust and dirt without inhaling the raised dust.
Secure the caliper in a vise. Remove the piston from the caliper by supplying low-pressure air to the brake cylinder through the hole for connecting the brake hose, installing a wooden block instead of the brake pads.
Pic. 15–20. Using a wedge to remove the seal from the caliper cylinder groove
Remove the wooden block and carefully remove the piston. Carefully, so as not to damage the cylinder walls, remove the seal from the groove of the caliper cylinder with a mounting wedge or a flat screwdriver blade as a lever (pic. 15–20).
Check the condition of all caliper parts and replace worn or damaged parts. Pay special attention to the cylinder and piston. If there are scratches, scratches, wear or pitting, the piston and cylinder must be replaced. Regardless of condition, replace all rubber seals.
Wash all parts in methanol or clean brake fluid and wipe dry. Blow out the pipes and holes with compressed air.
Pic. 15–21. Installation location of the protective cover on the caliper piston
Apply a thin layer of grease G 052 150 A2 to the O-ring and piston (pic. 15–21).
Install the dust cover on the piston so that the inner diameter of the cover fits into the piston groove.
Pic. 15–22. Using a special tool to install the working edge of the dust cover in the caliper
Install the piston against the caliper cylinder and insert the working edge of the dust cover into the caliper with a special tool until it locks into place (pic. 15–22).
Using a special tool or a hammer handle, press the piston into the caliper cylinder.
After installing the piston, blow out the cylinder with air and fill it with fresh brake fluid.
Visitor comments