Pic. 15–4. Front brake FN-3: 1 – brake tube; 2 - protective cap; 3 - guide pin, 25 Nm; 4 - brake hose, 15 Nm; 5 - support; 6 - bolt, 120 Nm; 7 - caliper holder (brake shoe guide; 8 - brake pads; 9 - spring; 10 - brake disc; 11 - bracket; 12 bolt, 10 Nm
The front brake device is shown in fig. 15–4.
Withdrawal
Loosen the front wheel mounting bolts, then raise the front of the vehicle and secure it on stands. Unscrew the mounting bolts and remove the wheel.
Be sure to replace all pads on the same vehicle axle, even if only one pad is worn. If the brake pads are to be reinstalled, they must be marked before removal.
Remove the protective caps from the inner ends of the guide bolts.
Pic. 15–5. Removing the retaining spring from the outside of the caliper
Using a screwdriver blade as a lever, remove the retaining spring from the outside of the caliper (pic. 15–5).
Pic. 15–6. Unscrewing the guide pin from the caliper
Unscrew the guide pins from the caliper (pic. 15–6).
Raise the caliper with the inner shoe and tie it to the A-pillar with a soft wire. The caliper must not hang on the brake hose. The brake hose must not be stretched or kinked.
Remove the inner pad from the caliper piston and the outer pad from the caliper holder.
Installation
Do not depress the brake pedal with the brake pads removed.
When replacing brake pads, do not unscrew the brake pipe.
Clean the dust and dirt from the caliper and the rust from the edge of the brake disc. If the pads are serviceable, clean them with a wire brush and rags.
Check brake disk for cracks, especially around the wheel bolt holes, for wear or mechanical damage, and replace both discs if necessary.
Measure the brake disc thickness.
If installing new brake pads, press the piston into the caliper using the tool. You can also press the piston into the caliper with a wooden rod or a hammer handle. At the same time, make sure that the piston is not warped and the surfaces of the piston and anther are not damaged. When the piston is pushed in, the brake fluid is forced out of the brake cylinder into the expansion tank, so constantly monitor the fluid level in the tank, and if necessary, pump it out of the tank a little.
Install the inner pad on the caliper, while the spring clip should enter the piston recess. An arrow is marked on the inner brake shoe with a spring. It must match the direction of rotation of the disk when moving forward. Otherwise, the brake pad will make extraneous noise during operation.
External brake pads are attached with a sticky layer on the base plate.
Pic. 15–7. The location of the front brake pads before installing the caliper
Remove the protective film from the adhesive layer of the outer brake pad and install it on the caliper holder (pic. 15–7).
Install the inner pad caliper onto the caliper holder. Screw in the caliper guide pins and tighten them to 25 Nm.
Install the protective caps on the caliper guide pins.
Install the retaining spring on the caliper, positioning the ends of the spring in the holes in the caliper.
Replace the brake pads on the second front wheel in the same way.
Install the wheels and lower the vehicle to the ground. After cleaning the ribbed base of the bolt heads, tighten the mounting bolts to 120 Nm.
Depress the brake pedal several times until the brake pads press against the brake disc.
Check the brake fluid level in the reservoir and top up if necessary.
After installing new brake pads, avoid sudden braking for the first 200 km of the vehicle.
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