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A spongy pedal is usually a sign of air in the system. Air may have got in through the master cylinder because the fluid level is low. If this is the case, refill the system with the correct grade of brake fluid, then bleed any remaining air out. Often the cause is simply that the fluid is leaking from somewhere in the system. It's usually pretty easy to find the leak if there is one, and once found it should be fixed straight away.
have the system checked for leaks then check the rear of the master cylinder for leaking out of the master. if these leak you may not see it unless you move it away from the power booster to visually inspect. to keep adding fluid there is a leak you just have not found it.
My first thought is that perhaps the fluid is over-filled. There must be some air space left in the reservoir to allow for expansion. Check to be sure it is not over filled. If it is than remove the extra amount and the leaking should stop. There is a fill line on the side of the plastic of the reservoir. A plastic medicine sering works good for the removal. Beyond this either the cap or the reservoir are likely cracked or a brake line is not seated correctly.
The leak could be due to a leaking brake line in the rear or a leaking brake cylinder. Have the car inspected for the leak by a reputable garage. The car will need to be towed, since it has no brakes.
If you do your own work, refill the master cylinder. Have someone depress the brake peddle while you look under the car for the leak.
The clutch hydraulic system is very simple, just 3 pieces. There is the clutch master cylinder with attached fluid reservoir-mounted on the firewall, there is a steel line from the master going down to the transaxle bell housing, and there is the clutch slave cylinder on the bell housing that the steel line connects to.
If yours is leaking under the car, it is probably the slave cylinder, either that or the steel line. Either one should be easy to replace.
Drain out the fluid again and refill with the right fluid. Run the engine and operate the steering several times, drain it again. Do this about four times, that should get most of the brake fluid out. Put in a bottle of Wynn's steering fix and top up the system and hope that you caught the problem in time. Good luck.
Fill the master cylinder reservoir and bleed the system. With any luck it will pressure up and work. The fact that it lost fluid means that you may have a bad seal on the slave cylinder or even the leaking master cylinder. If you notice a leak you might consider rebuilding or replacing the offending part. If you have lost the fluid out of the system , it is probably only a matter of time before you lose pressure again.
As the brake pads/shoes wear. Fluid level will decrease in the master cylinder resovoir. If the master cylinder ran empty you will need to refill with appropriate brake fluid (should say DOT 3 on cap) and bleed air from the system.
I would take back to the shop to check it out.
There could be another leak. Check the fluid in the master cylinder and if low refill with the correct fluid. The light should go off if the fluid is a low
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