Soft clutch, topped off clutch fluid reservoir and clutch pedal became firm/springing back on its own.

I have 1984 Celica Supra. I felt my clutch losing a pressure so I pulled over in a to check the clutch fluid, the reservoir was almost empty so I topped it off. Admittedly this is the first time, I've checked it since I got it up and running but I had a Yourmechanic Mechanic do work on my alternator last month on 10/13/16 and he said my fluid levels were fine and not leaking. After driving it around in the neighborhood for a few minutes, I felt the pedal become firm again and it was springing back on its own. There was no grinding when I was shifting gears and I didn't need to exert e
Experienced mechanics share their insights in answering this question :
It is most common for the clutch hydraulic leak to be from a leaking clutch slave cylinder. You should have the clutch hydraulic system inspected by YourMechanic to see why the fluid is getting low. The fluid gets low anytime there is a leak in the system. You may need to have the clutch slave cylinder replaced. If the clutch master cylinder and slave cylinder are both need replaced then it is a good idea to have both the clutch master and slave cylinders replaced together as a pair.

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It is most common for the clutch hydraulic leak to be from a leaking clutch slave cylinder. You should have the clutch hydraulic system inspected by YourMechanic to see why the fluid is getting low. The fluid gets low anytime there is a leak in the system. You may need to have the clutch slave cylinder replaced.
There are typically a few different possibilities for why a clutch pedal will stay on the floor. It could be a failed clutch master cylinder, slave cylinder, failed fluid line, or the clutch has failed.
If your clutch pedal feels soft or `spongy` at any point as you press it to the floor, it`s a sign your clutch fluid is low. That spongy, inconsistent feeling is due to air in the clutch line from the master cylinder to the slave cylinder.
We suggest you change the fluid: Every two years. If the fluid has dirt. If the fluid level goes down.
Sudden failure is most often caused by a broken or loose clutch cable, linkable or a failed hydraulic master/slave cylinder. There can also be leaks in the hydraulic line or even the disc could be contaminated with something like dirt or debris.
“Riding” the clutch is the most common reason for premature clutch failure. Even the slightest pressure on the pedal will partially disengage the clutch, causing the release bearing, pressure plate and flywheel to overheat.
In most loose clutch cases with a hydraulic system, it is a probably an issue with the master cylinder. Internal or external damage to the cylinder can cause the hydraulic fluid to leak out and it simply will not perform properly once the fluid is too low. Sometimes, it is simply a worn seal that needs to be replaced.
Air as cause of malfunction

As far as the hydraulic clutch is concerned, the following symptoms may occur: Change of the pedal travel. Difficulties in disengaging the clutch. Imprecise pedal feel.

Broken springs, overheating, and even a worn-out clutch disc can cause problems with the clutch pressure plate.
If you have replaced the clutch slave or master cylinder, the lines, or simply changed the fluid, you need to do an adequate job removing the air from the system before your clutch will work properly.
Just topping up is unlikely to fix anything, will normally need bleeding, and ideally the leak fixing !
If there is air in the system, you do not get enough pressure and the clutch is not able to fully engage. Bleeding the clutch is a process in which you remove all the fluid currently in the system, getting out all the liquid and air, and replacing it with purely liquid.
Although some hydraulic clutches can be adjusted, many are self-adjusting. Check in your car handbook or service manual. If slip occurs on a self-adjusting clutch, the clutch has to be overhauled. If drag occurs, the hydraulics may be at fault (See Checking and removing a clutch master cylinder ).
It`s often easy to tell when a hydraulic system fails — symptoms can include high temperatures, low pressure readings and slow or erratic operation are glaring problems.
Clutch fluid doesn`t go anywhere the only reason to get your fluid level go down is a leak. However if you drained the system for some reason (parts replacement or whatever) there might be air trapped inside the system after you fill it up. After some time that air gets to the top and fluid level goes down.
Fill the reservoir up to the maximum marking if the reservoir has one — never go over the maximum line. It doesn`t have to be filled to the brim. If the tank is too full, the fluid could spill or otherwise flood your vehicle`s clutch system. Stop and clean spills right away as soon as you notice them.
Clutch fluid doesn`t go anywhere the only reason to get your fluid level go down is a leak. However if you drained the system for some reason (parts replacement or whatever) there might be air trapped inside the system after you fill it up. After some time that air gets to the top and fluid level goes down.
Fill the reservoir up to the maximum marking if the reservoir has one — never go over the maximum line. It doesn`t have to be filled to the brim. If the tank is too full, the fluid could spill or otherwise flood your vehicle`s clutch system. Stop and clean spills right away as soon as you notice them.
Fill the reservoir up to the maximum marking if the reservoir has one — never go over the maximum line. It doesn`t have to be filled to the brim. If the tank is too full, the fluid could spill or otherwise flood your vehicle`s clutch system. Stop and clean spills right away as soon as you notice them.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Soft clutch, topped off clutch fluid reservoir and clutch pedal became firm/springing back on its own.
ANSWER : It is most common for the clutch hydraulic leak to be from a leaking clutch slave cylinder. You should have the clutch hydraulic system inspected by YourMechanic to see why the fluid is getting low. The fluid gets low anytime there is a leak in the system. You may need to have the clutch slave cylinder replaced. If the clutch master cylinder and slave cylinder are both need replaced then it is a good idea to have both the clutch master and slave cylinders replaced together as a pair.

Why would I keep getting air and fluid bleeding through the clutch system in my 2008 Infiniti G35
ANSWER : Hello. You more than likely have a bad clutch master cylinder. These will often have a seal failure on the back side of the cylinder which will either leak or suck in air. Both of these will cause this to occur. If there are not any leaks at the slave cylinder then the master cylinder needs to be replaced and bled. If you want to have this looked at, consider YourMechanic, as a certified mechanic can come to you to [determine what is causing the clutch to do this] https://www.yourmechanic.com/services/clutch-master-cylinder-replacement

Why does my clutch pedal sink to the floor and dosent come back up?
ANSWER : Hi – there are 2 main causes for the clutch going all the way to the floor. First – check that the return spring on the clutch pedal is in place. Second – I see you bled the system – bleed the system again. This is how I would do it – use a short length of hose connected to the bleeder screw, run that hose into a cup half full with recommended fluid…fill the reservoir, then have one person pump the pedal while the other opens the bleeder screw and watches until NO BUBBLES come out (and makes sure the reservoir doesn’t run dry). Then close the screw fill the reservoir to the mark, and test her out. If you would consider, YourMechanic can send a certified technician to you and assist you in troubleshooting this clutch issue.

My clutch pedal is stuck to the floor. A while back I started hearing noise in my clutch when I pressed it. The car drive fine, th
ANSWER : Your vehicle uses a hydraulically operated clutch system. The first thing to do is check the fluid level in the master cylinder and check for leaks although leaks at the slave cylinder might not be apparent. Internal seal failures can cause the same problem that one might experience (i.e., no clutch operation) with visible leaks and a low fluid level. The noise may be due to a failed clutch release bearing. Due to the noise and the misoperation, if the slave cylinder turns out to be faulty, you will probably need a new clutch as well as hydraulic components. The cause of the fault that you are reporting can be pinpointed if you request a hydraulic clutch system diagnostic. If you request that diagnostic, the responding certified mechanic will get this diagnosed and let you know exactly what must be done. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Clutch not working after replacing slave cylinder and master cylinder
ANSWER : Hello. We will be happy to help you with your vehicle. It sounds like you have a problem with your throw out bearing. You would likely need to drop the transmission once again and check that the installation of the throwout bearing is proper. You may also try to peel back the boot around the slave cylinder to see inside of the transmission. By doing so you may be able to see possible damages on the throwout bearing. It will be a great idea to use a stethoscope before you take the vehicle back apart to help pinpoint exactly what portion of the transmission coming from. Another very important thing that you should check are your axle’s, make sure they are seated correctly inside of the transmission.

There is a VERY loud roaring noise when i take my car above 60 on the highway coming from the soft top hood.
ANSWER : Hello Hannah. Sometimes on a soft top Jeep (specifically Wranglers), the excessive noise is caused by a weather strip on the outside of the doors that has worn out. It’s also possible that the interior ’weather strip’ on the top is the root issue. Before you spend the money to replace the roof, you might want to have one of our mobile mechanics come to your location and complete a car is making a noise inspection. This will allow them to pinpoint the precise source of the road noise issue; so the right repairs can be completed.

I can’t go into 4th or 5th gear and clutch does not engage after a recent clutch job, clutch release while in gear does nothing.
ANSWER : I would rule out the axle not being pushed all the way in. That would effect all speeds and gears. That you can engage gears other than 4th and 5th leads me to 2 m possibilities:
1. Shift linkage mis-adjusted.
2. Possible bent shifter fork internally.

If it feels like you can engage 4th and 5th with the engine OFF, then I would lean towards a clutch release issue.

Clutch pedal goes to the floor and doesn’t return
ANSWER : Hello, thanks for your question. You could watch the clutch fluid as it mentions in the test, but this really doesn’t tell you much. Most of the time this is caused by a bad clutch master cylinder. If the fluid level is low the first thing to do would be to locate the leak. If the fluid is full then I watch to see that he clutch slave is moving when the clutch is pressed. If it is and if it is releasing but the pedal stays down then that is another reason to change the clutch master. If the clutch slave and fork are not releasing then it may have an internal clutch failure. If you would like help getting this inspected or repaired, consider YourMechanic, as a certified mechanic can come to your home or office to perform the inspection and make or suggest any repairs needed.