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S3 (1974-1976)
Инструкция по эксплуатации Страница: 81

Kawasaki S3 (1974-1976) [81/129] Bleeding the brake

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Braking Stroke When the brake lever is pulled the piston in the master cylinder T is pushed and moves forward against the force of the return spring 3 At this time the primary cup at the head of the piston closes the small relief port 5 which connects the pressure chamber and the reservoir Until this port is fully closed the brake fluid does not start being pres surized in spite of the forward movement of the piston The pressure stroke starts as soon as the relief port is closed Brake fluid being used as a pressure medium the piston compresses the fluid and forces it through the check valve and out into the brake Jine Pressure from the line is felt in the cylinder d of caliper A id and pushes the piston toward the disc Pad A M at the end of the piston is pushed against the disc but since the disc is immovable further pressure cannot move the pad any further Instead the cylinder and entire caliper assembly move in the reverse direction so that pad B is pulled toward rhe disc In this manner the disc is pinched between the two pads and braking action is performed during brake operation This temperature could boil the brake fluid and cause a vapor lock in th lines unless fluid with a high boiling point is used and the fluid is kept from being contaminate with dirt moisture or a different type of fluid Poor quality or contaminated fluid can also deteriorate the rubber parts of the brake mecha nism although a special rubber is used to make them resistant to the recommended brake fl aids The graph of Fig 277 shows how brake fluid contamination with moisture lowers the fluid boiling point Although not shown in the graph the boiling point also lowers as the fluid gets old is contaminated with dirt or if two differen types of brake fluid are mixed Brake Fluid Boiling Point Iz T Braking Release Stroke When the brake lever is released the piston in the master cylinder is quickly returned toward its rest position and brake fluid pressure in the line and in the caliper master cylinder drops The elasticity of the oil seal ip in caliper A s cylinder then pulls back the piston This leaves no pressure against either pad A or B so that slight friction against the disc pushes them both a hairbreadth away from the disc As the master cylinder piston mo es back further the brake fluid in the line which still has some pressure rushes to fill the low pressure area in front of the primary cup at the piston head But the fluid is prevented from moving too fast by the check valve and the pressure in front of the piston drops lower At this time fluid from the reservoir flows through the large supply port 18 into the space between the primary and secondary cups through the non retum valve 4 and escapes around the edges of the primary cup to fill the vacuum When the piston finally returns to its rest position against the stopper the small relief port is uncovered and the brake fluid still returning from the line pushes any excess fluid through the relief port back into the reservoir until pressure in the line is again normal Brake Fluid When he brake is applied heat is generated by the friction between the disc and the brake pads While much of this heat is dissipated the rest is transmitted to the brake fluid and may Changing the brake fluid The brake fluid should be changed once a yta or every 6 000 miles 10 000 km whicheve comes sooner or if it becomes contaminated with dirt or water i Attach a clear plastic hose to the bleeder valve at the caliper and run the other end of the hose into a container ii Open the bleeder valve and pump the brake lever until all the fluid is drained from the lines iii Close the bleeder valve and fill the reservoi with new brake fluid iv Open the bleeder valve counterclockwise i open squeeze the brake lever close the valve with the lever held squeezed then quickly release the lever Repeat this operation until the brake is filled and fluid starts coming out of the plasti hose Replenish the fluid in the reservoir a often as necessary to keep it from running com pletely out v Bleed the air from the lines Bleeding the brake The brake fluid has a very low compression coef ficient so that almost ail the movement of the brake lever is transmitted direclty to the calipe for braking action Air however is easily com pressed and when air enters the brkae lines brake lever movement will be partially used in com pressing the air This will make the lever fee

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