Brake Pedal Too Hard To Press!!! - Ford Powerstroke Diesel Forum

 
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post #1 of 9 Old 02-26-2012, 10:45 AM Thread Starter
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Brake Pedal Too Hard To Press!!!

-1996 f-250 4wd- ... I need anyone's help asap, im new to this and could appreciate any help! i will try and explain my problem as simple as possible, and by the way i just changed my vacuum pump today and yesterday i bled my brakes, there were no leaks at any wheel nor around my master cylinder etc.... Ill be driving down the road and the first pump i give my brake pedal is fine but if i continue pumping the pedal while im slowing down it gets REALLY firm till the point that i can barely press it anymore and it takes a good second for the truck to finally stop, and while the pedal is really firm my brake indicator light comes on. But once i leave the pedal alone for a good 5 seconds or so, the pressure built up will finally decrease and the indicator light will turn off. Im thinking it could possibly be the brake booster or master cylinder??? ... i thought by changing my vaccum pump it was going to fix my problem but it didnt so now i need some advice please!
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post #2 of 9 Old 02-26-2012, 11:13 AM
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I'd go with break booster buddy!

1995 F-250 PSD, 2x4, Factory 3.5in with a straight pipe welded in, TS performance chip with canned tunes.
Missing the bed and the two front fenders are rusted beyond recognision.
One day i will have me a nice truck to put all these parts around..lol
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post #3 of 9 Old 02-26-2012, 12:50 PM
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I would check for vacuum leaks. Check the vacuum manifold that is on the drivers inner fender. If you have one hook up a vacuum gauge there, just because the vacuum pump is new doesn't guarantee anything but it really sounds like you have a serious leak

Jack
97 F250 Xlt, built E4od, D60 swap, Baby swamps, tunes by Dp
1.0 turbo housing, 203* t-stat, diy 6637, 4" exhaust
Diy intercooled, 6.0 fan, Diy 140v Idm, Isspro Ev gauges
On board air, E-fuel, 6" lift on 35's
322000 miles
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post #4 of 9 Old 02-26-2012, 06:46 PM Thread Starter
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ok i appreciate it guys! .. do you have any idea whatnumbers i should be looking at when i hook up a vacuum gauge?
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post #5 of 9 Old 02-26-2012, 07:00 PM
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No I'm not real sure but I would guess at least 20"

Jack
97 F250 Xlt, built E4od, D60 swap, Baby swamps, tunes by Dp
1.0 turbo housing, 203* t-stat, diy 6637, 4" exhaust
Diy intercooled, 6.0 fan, Diy 140v Idm, Isspro Ev gauges
On board air, E-fuel, 6" lift on 35's
322000 miles
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post #6 of 9 Old 02-26-2012, 07:10 PM Thread Starter
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Will try this tomorrow after i get the gauge!
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post #7 of 9 Old 03-01-2012, 10:10 AM
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i believe it should be close to 25 inches of vacuum
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post #8 of 9 Old 04-05-2016, 12:51 PM
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Did you ever figure out this problem my truck just started doing the same thing
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post #9 of 9 Old 04-07-2016, 06:36 PM
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need to pull at least 20" of vacuum, most new pumps pull 25-26." start with the pump itself and work backwards.

94.5 F250 Reg Cab 4x4 5 speed 4.10 276000 plus miles

97 F350 Crew Cab LB 4x4 5 speed 3.55 320000 plus miles (parts truck)



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