Question about 1994 Ford F350 Crew Cab

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I have a 94 ford 350 460 engine gas. i replaced the brakes and everything but my brake petal still goes to the floor i hear a "swooshing" sound by the master cylinder when i push on the petal. Im thinking its the master clyinder or the brake booster how do you tell ?

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I sounds like you have air in the system I would start by bleeding the entire system,when did the wooshing sound start before or after you replaced the brakes,and witch brakes did you replace(front,rear or all)

Posted on Sep 01, 2010

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Check for fluid leaks and your brakes. If you see no leaks and your brakes are in good shape replace the brake master cylinder and bleed the system. The air you hear is because the pedal went to the floor. If the booster goes bad the pedal will get so hard you can hardly push it at all. I think you will find if this happened suddenly either you have a major leak or the master cylinder went bad.

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Sounds like air is still in the brake lines, the air sound that you hear is the power assist, but the brake pedal needs to be "high and hard".

if the pedal goes to the floor, that is not good. Sometimes, when pumping brakes for bleeding purposes, the master cylinder gets damaged, as the piston goes past it's normal "travel zone" and gets damged on deposits.....

Now, with that being said, if everything was perfect, brakes are typically not as firm after replacement, due to differences in new pads/shoes and old rotors and drums. Pedal to the floor, however, is never okay.

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you did'nt say why you changed the rf brake hose, but i'm assuming it was leaking, check to make sure the new one is not leaking and there is no other leaks in the system, this includes the other 3 calipers and hoses, the rear hose in between the rear hard line on the frame to the rear hard line on the rear axle. if there is still air in the right side line then the left side would be doing all the work and may cause your abs to kick in on the left side if it is attempting to lock up. this may be the noises you are hearing. if you still have power brakes after you shut the engine off, (you should be able to pump the pedal 3 or 4 times with the engine off before the pedal becomes hard) then the booster is ok. if it has a swooshing sound inside the car, (hard to describe that sound on a keyboard), then you may have a leak in the seal on the brake pedal side of the booster. brake master cylinder sounds like it is bypassing. if it still goes to the floor after you rebleed then replace the master cylinder. if a brake pedal goes all the way to the floor, it is possible to ruin the cylinder and cause it to bypass, this is caused by rust or corrosion, the seals on the plunger are compromised letting brake fluid leak past. any other questions please let me know. thanks

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