Brakes seem soft and sometimes work better with a few pumps - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 13 (permalink) Old 10-06-2012, 02:25 AM Thread Starter
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Brakes seem soft and sometimes work better with a few pumps

My brakes seem soft sometimes and after 2-3 pumps get a bit firmer.

any ideas?

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post #2 of 13 (permalink) Old 10-06-2012, 02:28 AM
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When's the last time your truck has seen fresh brake fuid? I bet a good bleed will help them tons

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post #3 of 13 (permalink) Old 10-06-2012, 08:18 AM
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Re: Brakes seem soft and sometimes work better with a few pumps


97 F-350 XLT CC DRW 4X4 PSD, 285/75-16 Custom bumpers, Gauges-boost/egt/trans, Swamps IDM, 3.5"dp- 4" exh., 3" Body lift, ES bushings/mounts, Built trans, billet conv, B&M pan, Hayden cooler, Adrenaline, stage 2's, IC, H2E, E-fuel
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post #4 of 13 (permalink) Old 10-06-2012, 09:11 AM
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Try and suck out 98% of old fluid in reservoir and replace with fresh before bleeding. Makes it go a little quicker.

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post #5 of 13 (permalink) Old 10-06-2012, 04:18 PM
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Re: Brakes seem soft and sometimes work better with a few pumps

Typically, air and never changed fluid lead to sponginess. If new fluid and a good bleed doesn't fix/help it, you are most likely looking at a master cylinder/booster problem.

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post #6 of 13 (permalink) Old 10-08-2012, 04:16 PM Thread Starter
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Re: Brakes seem soft and sometimes work better with a few pumps

Brake fluid is all new. First thing I do when I buy a vehicle. Change all fluids

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post #7 of 13 (permalink) Old 10-08-2012, 05:37 PM
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Re: Brakes seem soft and sometimes work better with a few pumps

Maybe vacuum pump getting weak or booster???

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post #8 of 13 (permalink) Old 10-08-2012, 11:46 PM
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Re: Brakes seem soft and sometimes work better with a few pumps

If it's weak then the brakes would be too firm.

If you just bled them, there is still air in the system or the rubber brake hoses are bulging.

How did you bleed them?

Use a vacuum or pressure bleeder?

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post #9 of 13 (permalink) Old 10-09-2012, 05:30 PM
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Re: Brakes seem soft and sometimes work better with a few pumps

Quote:
Originally Posted by Coueshunter View Post
My brakes seem soft sometimes and after 2-3 pumps get a bit firmer.

any ideas?
I almost bet if you put a T in you vacuum line so you could put a vacuum gauge (which would provide great brake pressure assistance) on it you would see good vacuum for the first pump then it would drop each pump in succession afterwards (less vacuum the firmer they feel from less assistance) because the pump can't keep up. One of reasons I went to hydroboost.

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post #10 of 13 (permalink) Old 10-10-2012, 03:43 AM
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Re: Brakes seem soft and sometimes work better with a few pumps

Adjust rear brakes.

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