Yamaha XS360 (1976-1982) [31/34] Yamaha xs360 400

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Yamaha XS360 400 master cylinder has been dry for awhile the seals inside the cylinder may have be come dried and cracked In this case re build the master cylinder 1 Top up the reservoir with brake fluid and replace the cap to keep dirt and moisture out and the fluid in Cover the gas tank with a thick cloth to avoid damage due to spilled brake fluid 2 Attach one end of a small diameter rub ber hose to the bleed valve on the caliper and place the other end in a jar which con tains several inches of clean new brake fluid Be sure that the end of the hose is sub merged in this fluid Arrange the hose so that it loops upward after leaving the bleed valve and see that it has no kinks or sharp bends 3 Pump the brake lever rapidly several times until some resistance is felt and hold ing the lever against the resistance open the bleed valve about one half turn When the lever bottoms close the valve do not over tighten and then release the lever 4 Repeat the operation until no more air is released out of the hose and the brake lever is firm in operation Check the fluid level in the reservoir often to make sure that it doesn t go dry and draw more air into the system Do not reuse fluid that has been pumped out of the system Do not use fluid that has been stored for more than a few weeks after the seal on its container has been opened as brake fluid will absorb moisture from the air and may corrode the master cyl inder and caliper 5 Refill the reservoir to the level mark when through but do not overfill Avoid overtightening the cap or fluid will weep around the cap edge Inspection 1 Clean all parts in new brake fluid Do not use gasoline or other solvents 2 All rubber parts should be replaced with new ones once the caliper has been disassembled These parts should also be re placed every two years as a matter of preven tive maintenance 3 Check the piston for scoring or other obvious signs of wear and replace it if dam age is noted Check the caliper bore as well Assembly 1 Using a new caliper support bolt is rec ommended As noted above all rubber parts must be replaced as well 2 Lightly lubricate the piston seal with fresh brake fluid and install it in the caliper Be sure that the seal is properly seated 3 Lubricate the sides of the piston with brake fluid and install it 4 Fit the caliper and support bracket together not forgetting the bushing and bushing boot Install the support bolt and tighten it to 11 15 ft lbs 5 Install the brake pads Secure the fixed Caliper components 1 piston seal 2 boot 3 dust cover clip 4 bushing boot 5 bleed screw 2 Tighten the brake line banjo bolt to 18 25 ft lbs Bleed the system MASTER CYLINDER Removal 1 Disconnect the front brake light switch leads 2 Remove the brake lever Note the re turn spring 3 Disconnect the brake line from the master cylinder Take adequate precautions to avoid spillage 4 Remove the two master cylinder hand lebar clamp bolts and remove the master cyl inder assembly Disassembly 1 Remove the master cylinder cap and di aphragm and drain off and disgard the brake fluid 2 Remove the master cylinder rubber boot 3 Remove the snap ring Take out the piston assembly The spring will remain in the master cylinder 4 Remove the spring and stopper valve 5 Remove the stopper plate and the cyl inder cups Front Disc Brake PAD REPLACEMENT 1 Unbolt the caliper from the fork slider 2 Remove the pad screw which secures the fixed pad on the wheel side of the caliper Remove the fixed pad 3 Remove the piston pad 4 Installation is the reverse of removal Secure the fixed pad phillips screw with a non permanent thread locking compound Inspection 1 Clean all parts in fresh brake fluid 2 Check the master cylinder port for clogging CALIPER Removal 1 Disconnect the brake line from the cali per Plug the end of the brake line to prevent loss of brake fluid 2 Remove the mounting bolts and take the caliper from the fork slider Disassembly 1 Remove the phillips screw which se cures the fixed pad and take out the pad and pad spring 2 Remove the piston pad 3 Remove the caliper support bolt Sepa rate the caliper and support bracket Remove the piston dust seal and retaining ring 4 Apply compressed air to the brake line fitting on the caliper and force out the piston Caution Be sure your fingers are clear of the piston as it may come out with some force 5 Remove the piston seal Master cylinder components CYLINDER CUP 2 CYLINDER CUP INSTALLER Caliper pad components 1 pads 2 pad spring 3 screw 4 retainers pad phillips screw with a non permanent thread locking compound Grease the pad shim contact area before installation Bend each tab of the shim over the piston pad Installation 1 Tighten the caliper mounting bolts to 21 29 ft lbs Installing the cylinder cup 1293

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