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Old October 11th, 2007, 06:39 PM   #1
Chiefwoohaw
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Default Power Booster Question

I thought I had a bad power booster. I changed the power booster and I still loose pressure. Do you think that there is air in the lines and everything needs to be bled? Any other suggestions?

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Edit: 1995 F-250 Powerstroke

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Old October 11th, 2007, 06:46 PM   #2
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make/model.....vacuum/hydro??

If the brake system (assuming thats what you're talking about) looses pressure when you pump the pedal with the key off (and frankly I can't see a power booster causing a loss of pressure at all - unless the master is leaking fluid into the booster and the motor is eating it), there is air in the lines.....you did bench bleed the master when you swapped the booster correct??
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Old October 11th, 2007, 06:55 PM   #3
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make/model.....vacuum/hydro??

If the brake system (assuming thats what you're talking about) looses pressure when you pump the pedal with the key off (and frankly I can't see a power booster causing a loss of pressure at all - unless the master is leaking fluid into the booster and the motor is eating it), there is air in the lines.....you did bench bleed the master when you swapped the booster correct??
No, I didn't take the lines off the master. I'm going to bleed everything tomorrow and see how that goes.
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Old October 11th, 2007, 06:56 PM   #4
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vacum pump???
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Old October 11th, 2007, 06:58 PM   #5
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vacum pump???
You've got to go into depth a bit on this subject with me
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Old October 11th, 2007, 07:13 PM   #6
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what was your original problem?

If the power booster goes bad and leaks (vacuum as air isn't an issue when it leaks unlike ps fluid) the pedal gets harder, as you have no power assist...Unless the thing is sucking brake fluid into the manifold and causing the master to run out of fluid.

Either way, I would bleed the brakes and see what happens....one of the first things to do if you got a soft/low pedal and there isn't any visible leak
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Old October 11th, 2007, 07:36 PM   #7
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vacum pump???
never was told vacuum pump or hydro. thats what i was asking
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Old October 11th, 2007, 07:38 PM   #8
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buddy has a E350 and the pedal was low but could pump it up but when you put it in gear it would go back to the floor found out the rear brakes where out of adjustment and the driver rear self adjuster wasnt in right either fixed everything and has a good pedal now
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