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01 Dually brakes fade

1287 Views 6 Replies 6 Participants Last post by  dodgerebel1
At low rpm's brake pedal almost goes to floor.This occures 50% of the time at low rpm.When rpm is up brakes are fine.Fluid levels are full (power steering,master cylinder).No leaks.
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might have some air in the line...possibly
 

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and this is why i like brakes on older gasser trucks...
 

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I think buck08 has it. I think you have worn seals in your master cylinder. If you push the pedal slowly it should go more readily to the floor, or halfway down depending on if both seals are bad. If you push it fast, the abrupt pressure will make the worn seals open up like an umbrella, and they won't leak.

Be careful replacing it. You DO NOT want air to get to the abs unit. It is a true pain to get the air out, and it makes your rears lock up until it does.
 
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