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Old Oct 18, 2015 | 03:04 PM
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brakes fade

hey guys, i am working on a e-150 van, 2005. the brake pedal fades to almost the floor with little pressure on it. I just replaced the master cylinder, bled the entire system, and it STILL fades to the floor. driving, or in park. engine running. any ideas?
4 wheel disc, 4 wheel abs...
 
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Old Oct 18, 2015 | 07:30 PM
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I have read here that these systems are hard to bleed.

If you have not already done so, google "bleeding abs brake systems" and find a billion hits, including this:

Bleeding ABS Brake Systems

Since you were upstream of the ABS gizmo, you probably have air in it and will have to do some of the fancy footwork required to get it out.

Good luck with it.
 
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Old Oct 18, 2015 | 07:37 PM
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uggg. i was wondering about air in the system, but it was never run low or opened up. idk, maybe i will borrow a pressure bleeder and try that for a gallon or 2 ..lol . i know someone with a BG machine. I read somewhere it might be the abs unit, but theres no way to diag that. Big nut to shell out on a guess...
 
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Old Oct 18, 2015 | 09:08 PM
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Since you replaced the master, you were open upstream of the abs. The power bleeder is probably the answer. Note in that link they talk about the abs pumps being tough to clear out.
 
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Old Oct 18, 2015 | 09:22 PM
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yes i did replace the master, only because of this exact same problem..but i will try bleeding. ty
 
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Old Oct 26, 2015 | 06:36 AM
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Did you bench bleed the MC before connecting it to the brake lines? That can be an issue too, introducing air into the ABS block.
 
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