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I have bled all 4 wheels and still have sinking pedal

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If brake bleeding was done correctly, then you have a bad master cylinder. Correct procedure is (just to verify) - start with right rear, left rear, right front & finnish w/left front.

Posted on Mar 22, 2011

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First check each wheel brake cylinder for small leaks. If no leaks then the brakes have not been bled properly. Liquid will not compress like air, thus the reason pumping the pedal makes the brake pedal come up. If you had all of the air out of the lines then you pedal would not be soft. With your pedal going to the floor either there is air in the lines or fluid is slowly leaking.If it is a small leak on one of your wheel cylinders, it may be hard to detect without pulling the wheels off and looking. Small leaks on your wheel cylinders may never drip off of the car.

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Make sure the rear brakes are adjusted and also make sure there are no leaks. if there are no leaks then you have air in the system or a bad mastercylinder, rebleed the brakes, have someone inside pumping the pedal three times every time, then start at the right rear wheel and bleed it four times, each time have them pump pedall three times and hold it down, then go to left wheel and do the same then the right front then left front. to make sure you dont run master dry top off the fluid after every wheel, then adjust the rear brakes, and after that if pedal is low replace the master but you may just have air in the system, and make sure there are no leaks on any line. hope this helps.

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were you getting fluid out of rear wheels,any leaks, is pedal sinking or good,may have bad master, or brake hose,

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adjust your rear shoes up so that the rear drums just turn, with them ajusted to a low setting the brake pedal will be low .
also when you start your engine it is noral for the pedal to drop because of the boster ! [ but not to the floor ]
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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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