Toyota Corolla: Clutch hydraulic system - bleeding
Warning: Hydraulic fluid is poisonous; wash off immediately and thoroughly in the case of skin contact, and seek immediate medical advice if any fluid is swallowed or gets into the eyes. Certain types of hydraulic fluid are inflammable, and may ignite when allowed into contact with hot components; when servicing any hydraulic system, it is safest to assume that the fluid IS inflammable, and to take precautions against the risk of fire as though it is petrol that is being handled. Hydraulic fluid is also an effective paint stripper, and will attack plastics; if any is spilt, it should be washed off immediately, using copious quantities of clean water. When topping-up or renewing the fluid, always use the recommended type, and ensure that it comes from a freshly-opened sealed container.
1 The hydraulic system should be bled of all air whenever any part of the system has been removed or if the fluid level has been allowed to fall so low that air has been drawn into the master cylinder. The procedure is similar to bleeding a brake system.
2 Fill the master cylinder with fresh brake fluid of the specified type.
Caution: Do not re-use any of the fluid coming from the system during the bleeding operation or use fluid which has been inside an open container for an extended period of time.
3 Raise the vehicle and place it securely on axle stands to gain access to the release Cylinder, Which is located on the front side of the clutch housing.
4 Locate the bleed screw on the clutch release cylinder (adjacent to the fitting for the hydraulic fluid pipe) (see illustration).
Remove the dust cap which fits over the bleed screw and push a length of plastic hose over the valve. Place the other end of the hose into a clear container with sufficient fluid to submerge the end of the hose.
2.4 The clutch release cylinder bleed screw (arrowed) is adjacent to the hydraulic pipe
5 Have an assistant depress the clutch pedal and hold it. Open the bleed screw on the release cylinder, allowing fluid to flow through the hose. Close the bleed screw when fluid stops flowing from the hose. Once closed, have your assistant release the pedal.
6 Continue this process until all air is evacuated from the system, indicated by a full, solid stream of fluid being ejected from the bleed screw each time and no air bubbles in the hose or container. Keep a close watch on the fluid level inside the master cylinder reservoir; if the level drops too low, air will be sucked back into the system and the process will have to be started all over again.
7 Install the dust cap and lower the vehicle.
Check carefully for proper operation before placing the vehicle in normal service.
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