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No clutch fluid moves from the reservoir to the master cylinder during bleeding

Motor Vehicle Maintenance & Repair Asked by RonYe on October 12, 2020

When I do the clutch fluid bleeding to my Nissan Maxima 96, I can push the fluid out of the slave valve. However, I don’t see any fluid move from the reservoir into the master cylinder when I press and lift the clutch pedal many time.

How come the master cylinder will not suck fluid from the reservoir? By the way, the reason I bled my clutch hydraulic system is because the clutch becomes soft when I start the car with cold. After 5-10 minutes the car running, the clutch pedal becomes normal.

One Answer

Start with some basic tests/troubleshooting.

  1. Verify that your clutch master cylinder (located driver's side under the dash usually mounting against the clutch pedal) is not leaking.
  2. Verify that your clutch slave cylinder (it will be mounted on the transmission) is not leaking.
  3. Verify all lines between are not leaking.
  4. If there are no fluid leaks at the master cylinder, no swirl or bubbles in the clutch reservoir, and the clutch pedal does not slowly descend with constant pressure, then the master cylinder is likely working properly.
  5. If there is still softness in the clutch pedal, you likely need to bleed it again. As advised above, you should just go get a cheap brake bleeder, it will make bleeding it much easier.

IF the Slave Cylinder or any of the lines are leaking, they have to be replaced.

Tips: Don't let the clutch reservoir run out of hydraulic fluid. If you don't want to spend the $20 on a brake bleeder, get a friend and do the procedure below to bleed the clutch.

  1. Check the fluid level in the reservoir. Fill it to max.
  2. Locate the bleeder screw on the slave cylinder.
  3. Attach an appropriately sized tube to the bleed screw to redirect the hydraulic fluid so it doesn't spray everywhere. This can be fed into a bucket, empty bottle, or whatever.
  4. Open the bleeder screw on the slave cylinder.
  5. Have friend press the clutch pedal in and hold it.
  6. Close the bleeder screw.
  7. Have friend release the clutch pedal (if it sticks, have them pull it up).

Answered by finleyarcher on October 12, 2020

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