brake vacuum pump? - Ford Powerstroke Diesel Forum

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post #1 of 15 Old 07-16-2007, 08:28 PM Thread Starter
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brake vacuum pump?

randomly the other day getting off the freeway pulling a trailer. my brakes became really hard to push, like there was no power brakes. At the same time, the little brake light light came on and stays on. Some times it will go off and the brakes are normal to push agian, then right away they wulk become hard again... My guess it is the vacuum pump.. does this sound correct?

thanks for any info!

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1999 F-250 PSD 6 speed, extra cab, 8" lift, bilstian chrome shocks, 38" toyo's, Edge Juice & Superchip

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post #2 of 15 Old 07-16-2007, 10:35 PM
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How does your steering feel when your truck does that?
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post #3 of 15 Old 07-17-2007, 08:41 AM Thread Starter
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My steering is normal and everything else. Just the brakes.

------------- CORVALLIS, OR -----------------

1999 F-250 PSD 6 speed, extra cab, 8" lift, bilstian chrome shocks, 38" toyo's, Edge Juice & Superchip

1996 F-250 4x4 ext cab, work truck
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post #4 of 15 Old 07-17-2007, 08:57 AM
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The reason i ask is because i had my pump give out and it affected the steering also. i would check the brake system, see if there is a leak in the pump lines. usually if the pump goes out, in my encounters, the steering goes with the brakes.
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post #5 of 15 Old 07-17-2007, 09:02 AM
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It could be the brake booster or it could be the mastercylinder. If you lost your brake fluid do to a broken line or hose. Your pedal would most likely become spongey feeling and you would have no brakes. But if the mastercylinder is locking up it will cause this problem. Also if the brake booster is going bad it may cause this problem.


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post #6 of 15 Old 07-17-2007, 09:14 AM
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i had the same problem with my truck two weeks ago, brakes hard to push, sometimes check brakes light would come on. The vacum pump on my truck never effected the steering. Maybe on the newer trucks it does, but didnt on mine. 128 bucks for a new vacum pump and 45 minutes later everything worked great.


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post #7 of 15 Old 07-17-2007, 09:36 AM Thread Starter
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Is this what it is? its the cheapest thing to try
eBay Motors: 94 95 96 FORD TRUCK F250 F350 F450 7.3 VACUUM PUMP NEW (item 170126611425 end time Jul-29-07 08:59:16 PDT)

------------- CORVALLIS, OR -----------------

1999 F-250 PSD 6 speed, extra cab, 8" lift, bilstian chrome shocks, 38" toyo's, Edge Juice & Superchip

1996 F-250 4x4 ext cab, work truck
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post #8 of 15 Old 07-17-2007, 11:07 AM
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Yeah i got mine from a local parts store, you have to have a special puller to get the pulley of the old one and to install on the new one. Cuz the pulley is just pressed on there. I believe its the same puller for the power steering pulley. My friends dad owns a shop i had him pop the old pulley off and reinstall the new one.


1996 Ford F350 Regular Cab 5spd with the 7.3L PSD, 4x4, 35.5x12.5x16.5 All-Terrain T/A's, 3.73s', DIY Electric Reg Return Fuel Sys, 3" Downpipe, AFE Stg 2, 17* HPOP, IDM Mod, SB Con-O, Cat and Muffler Delete, AutoMeter NV Series Boost, Fuel Press. and Pyro, Autometer 3 Pod A-Pillar, TS Performance 6 Pos Chip. HPX Mod, 335,000 Miles
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post #9 of 15 Old 07-21-2007, 09:20 AM
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Vacuum Pump

yep..its the vacuum pump....mine did exactly the same thing. Replace the pump and it will be fixed.

Brad
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post #10 of 15 Old 07-21-2007, 09:36 AM
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if you want a quick and easy check, pull the line from the booster and start the truck there should be vaccum there. pump does sound like your problem tho, i had mine go a couple months ago and it did what you are explaining.



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