Soft/sinking brake pedal - Ford Powerstroke Diesel Forum

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post #1 of 7 Old 09-13-2013, 08:11 PM Thread Starter
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Soft/sinking brake pedal

97 F350. NEW rear drums & shoes. front pads/rotors less than 8 months old. Bled the crap out of brakes and installed a new master cylinder. I still have a squishy pedal, which when pressed hard, sinks almost to the floor. When pedal goes down, the brakes still hold. I've seen one post where the member put the truck on a sever down angle, nose down and bled brakes. This angle caused the master cylinder to be level allowing the air to finally escape.

Anybody have this issue? I'm going to try to bleed them Monday after my weekend night shifts.....Tired of this situation.

Also - there is no way the vacuum booster can cause this issue? I know it can cause brakes to apply if the internal spring breaks, but I see no way it can cause this issue..
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post #2 of 7 Old 09-13-2013, 09:43 PM
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I think you have a bad reman Master cylinder.

Booster wouldnt make any difference with your symptoms. Did you bench bleed the MC?
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post #3 of 7 Old 09-13-2013, 10:04 PM
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Might have bench bleed the master cylinder wrong... Or not at all.

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post #4 of 7 Old 09-14-2013, 02:59 PM Thread Starter
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Bench bleed mc real well. Symptoms are EXACTLY as they were with old mc as they are with NEW (not reman) mc. After doing more reading I'm leaning to the ABS sensor. It does it ONLY when running.
Thanks!
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post #5 of 7 Old 05-22-2014, 06:21 PM
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Did you resolve the issue? I am having the same problem.
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post #6 of 7 Old 03-23-2016, 04:12 AM
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iv got same problem, bleed brakes many times fluid comes out hard with no air, replaced master cylinder , still did same thing, brakes build up when not running, also heard that this abs valve is the problem, going to bypass like every one else does to see if thats the problem ,
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post #7 of 7 Old 03-25-2016, 11:25 PM Thread Starter
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I've researched it - it is the vacuum booster. There is a non-fading booster, part number F5TZ-2005-CA. At around 200 bucks, I'll deal with the sinking pedal unless it becomes a problem!
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