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OK........as you have stated that you have bled the brakes properly.....was there fluid coming out each bleed nipple as a flowing stream...????
And did you shut off the bleed nipple half way down stroke....?????
If this is all ok, then I would be looking at a failed master cylinder.......and what is occurring is the fluid is leaking from the primary to the secondary within the master cylinder !!!!!
on the back side of calipers you will see a small bleed fitting -- attach a small 1/4 inch CLEAR hose to this fitting and run it into a catch bottle ( of some kind ). top off the brake fluid reservoir with fluid. now you will need a helper to sit in the drivers seat and ready your commands. use a small wrench and turn the bleed fitting counter-clockwise ( only about 1/2 turn ) -- have your helper press down the brake pedal and hold it to the floor,, and with the brake pedal to the floor you need to close the bleeder,, as soon as it is closed - have your helper let up off the brake pedal,, now open the bleeder again and have them push and hold the pedal to the floor again,, close the bleeder -- have them release the pedal,,, continue this process until you see no air bubbles flowing out the bleeder ( thru the clear hose ). keep the reservoir topped off with fresh brake fluid ( do not let it run dry or you will have to bleed the lines again ). repeat these steps for all calipers on the car and you will be good to go. --- also keep in mind that as soon as all the air is bled from the system -- when you pump the brakes, the pedal should get very hard and stiff,, if it goes to the floor after you have bled the system - then you still have air in one of the lines and you will need to continue bleeding.
If you have a soft brake pedal and have to push hard to slow down or pump the brakes to slow down then you probably have air in the brake lines from the last brake pad replacement. The brakes need to be bled with this method: Use 1/8 inch 2 foot long hose from parts store and attach the hose from bleeder valve ball on the brake caliper to a bottle partially filled with brake fluid. The end of the hose in the bottle must be submerged in the fluid in the bottle. With a second person holding the brake pedal to the floor, slowly turn bleeder valve counter clockwise (loosen tiny bit) with wrench and watch for dirty brake fluid to create bubbles in the bottle. When bubbles start, quickly tighten bleeder valve back to tight. Second person should lift foot, pump and then while valve is still tight should push the pedal to the floor again and THEN you again open bleeder valve slowly turning counter clockwise and watch for bubbles. Repeat until no more bubbles can be created in the bottle where the hose is submerged. Move to next caliper and repeat. For a firm brake pedal you will need to repeat this on all four calipers.
Hi I'm litoshop if you bled the system and get no results then your brake pump needs to be replaced now before replacing make sure your pads are installed correctly because if there not this to can cause this problem good luck. if this information has been useful please let us know thank you.
When you bleed the brakes are you starting with brake furthest from the master cylinder? Also was the master cylinder bench bled? If everything there is okay and you are not getting any air in fluid stream, you could try bleeding the brakes by having some one slowly pump the pedal till it is firm. Then have them let off open first bleeder valve and slowly depress to floor and hold there untol the valve is closed. repeat this at all bleeders. You may want to have car running to do this. Try this and let me know.
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