Question about 1991 Mazda Navajo

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I have a 1991 Mazda Navajo and put a new master cylinder on it and now I have brake pedal fade .

It has new brake lines, new master cylinder now after bleeding the system the ABS and brake light comes on and if you are stopped the brake pedal will fade to the floor. Is there some secret to this? How can I fix this, I have done every thing that I can think of?

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Bleed the whole system back to front..still fade you are getting air somewhere... may have to bleed the master out of the car then put back

Posted on Dec 14, 2014

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1 Answer

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you have to remove the pipes that go out of the master cylinder and purge the air later you connect the pipes and it purges the air in every auxiliary cylinder and the pedal will begin to have pressure

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You will need two people, one to pump the pedal and one to open bleeders at the wheels. Start at the right rear wheel open bleeder and have someone press the brake pedal down and hold it (do not release pedal until bleeder is closed), close the bleeder and repeat until no air is coming out. Proceed to right rear wheel repeat above prceedure, proceed to right front wheel repeat above, go to left front wheel repeat above, and then check pedal for proper feel if it is a solid pedal with no fade then you have finished. If you have a low pedal or fade then bleed master cylinder. You can bleed master by breaking loose the rear line (do not loosen line all the way) just enough that fluid comes out when pedal is pressed and held. Have some press the pedal while line is loose and hold it, tighten line and repeat until no air comes out, repeat same proceedure with the front line. If you still have a low pedal or fade then you may have a leak somewhere or a faulty master cylinder.

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