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Intermitantly when backing up brake pedal goes to the floor,once while going forward,had master cylinder replaced but still have problem,2004 ford ranger
Re: Intermitantly when backing up brake pedal goes to the...
Lif up the truck then ably emergency brakes to the rear wheels then see if the wheel spins freely hen press on the pedal ask some one to try to spin all the wheels to see which one is not breaking properly
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You need to check wheel cylinders, the only way that the brake peddle will go to the floor like that is if there is a lose of fluid pressure somewhere .
The problem may be that the master cylinder needs to be bench bled,there is most likely air trapped in the piston of the master cylinder.The problem comes from the piston not being fully actuated when connected to the pedal assembly.A vacuum bleeder will generally pull it out.
Did you bench bleed the master cyl. before installing it? then when you installed the new master, did you bleed all 4 points? If yes, then check all for points for leaking caliper/s and leaking wheel cylinder/s. If the van has ABS, check the valve body for a bleeder screw and see if air bleeds out of it. If you've checked everything twice and did everything right then your new master cyl. may be defective.
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