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  #1  
Old 02-01-2010, 07:53 AM
renchr56 renchr56 is offline
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VACUUM PUMP

I've got a 2001 E-350 w/7.3. Does anyone know how much vacuum the pump puts out. The reason I'm asking is the brakes are hard to stop the vehicle. I replaced the booster and that helped with the hardness of the pedal but it didn't take care of the stopping. I still have to stand really hard on the pedal to get it to stop.
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  #2  
Old 02-01-2010, 08:14 AM
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miller_feed miller_feed is offline
Hook it, I'll pull it.
 
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Our trucks don't use vacuum to boost the brakes, it gets its boost from the powersteering pump. Be sure to use ATF in the powersteering pump, not powersteering fluid.
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Old 02-01-2010, 08:19 AM
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mueckster mueckster is offline
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Roland Mueck
I tried to find the vacuum specs on my Ford dvd manual, but I didn't. It's been quite a while since I worked on a 7.3 with the mechanical vacuum pump. I want to say less than 15 inches of vacuum will give you hard pedal problems. Have you installed a vacuum gauge to the pump and checked it yet? You could attach a hose to the pump's connection and draw on it to see if the diaphragm is ruptured. Are the HVAC vents functioning normally?
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  #4  
Old 02-01-2010, 08:22 AM
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miller_feed miller_feed is offline
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Quote:
Originally Posted by mueckster View Post
I tried to find the vacuum specs on my Ford dvd manual, but I didn't. It's been quite a while since I worked on a 7.3 with the mechanical vacuum pump. I want to say less than 15 inches of vacuum will give you hard pedal problems. Have you installed a vacuum gauge to the pump and checked it yet? You could attach a hose to the pump's connection and draw on it to see if the diaphragm is ruptured. Are the HVAC vents functioning normally?
Roland, how does vacuum effect the brake pedal?
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2001, F-350, DRW. CC. LWB, 4X4, LARIAT,
MODS: 6637 W/Pete's cover, BTS-TRANS, DP-TUNER LIVE, MBRP 4" SS, Isspro 3 gauge kit, TN-BB turbo, Bellowed up pipes, HPX, TRU-COOL cooler, SS Stage II injectors, and the Chris-fifty.
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Old 02-01-2010, 08:24 AM
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Roland Mueck
Rick,
He has an E-series van. Different animal. They have the vacuum assist brakes on the E-150 thru 350. E-450 has hydroboost.
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  #6  
Old 02-01-2010, 08:28 AM
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miller_feed miller_feed is offline
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Originally Posted by mueckster View Post
Rick,
He has an E-series van. Different animal. They have the vacuum assist brakes on the E-150 thru 350. E-450 has hydroboost.
lol, OK. I was wondering what the heck was going on. Didn't dought you, just wondering what I was missing.
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  #7  
Old 02-01-2010, 09:07 AM
renchr56 renchr56 is offline
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Yeah it's been awhile since I've had to work on one of these as well. I do know that the vacuum I'm putting out definately isn't enough to get everything working the way it should as I only have 5 lbs. vacuum. But I do know that when I replaced the brake booster the pedal became softer. That is the reason for my question.
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  #8  
Old 02-01-2010, 09:25 AM
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Roland Mueck
Sounds like the vacuum pump is next on the list.
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'01 F-250 Lariat CC SB 4x4, DP Tuner F6 (live tuned), AFE II w/ Pete's Cover, GTP38R w/ RR billet whl & cross drilled 1.0, 6.0 Techni-cooler, Full Force SS Injectors, Stealth HPOP, Fluidampr, Melling M-208, Walbro FP, mueckster Reg Return & Bowl delete, Comp Cams 910's, mueckster 4R100, 4" SS MBRP, 6.0 Trans Cooler, Truetrac rear ...SOLD...
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Old 02-01-2010, 09:29 AM
renchr56 renchr56 is offline
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Yup sure does. It's gotta be that as everything else is working. When I get it swapped out will let you all know what the vacuum is
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  #10  
Old 02-01-2010, 09:36 AM
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Roland Mueck
Cool! It's been over 10 yrs since I replaced one and I didn't bother to check the vacuum reading then. It will be some good info for the memory banks. We have a few vans, that we contract on, at our company. I can pass on the info to the mobile mechanics who work on them. I work on them, occasionally, when they come into our shop for service.
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'01 F-250 Lariat CC SB 4x4, DP Tuner F6 (live tuned), AFE II w/ Pete's Cover, GTP38R w/ RR billet whl & cross drilled 1.0, 6.0 Techni-cooler, Full Force SS Injectors, Stealth HPOP, Fluidampr, Melling M-208, Walbro FP, mueckster Reg Return & Bowl delete, Comp Cams 910's, mueckster 4R100, 4" SS MBRP, 6.0 Trans Cooler, Truetrac rear ...SOLD...
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Old 02-01-2010, 01:32 PM
renchr56 renchr56 is offline
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Well the answer to my question is... New vacuum pump will put out between 25 - 27 in. vacuum. It was definately the vacuum pump. Thanks everyone
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  #12  
Old 02-01-2010, 09:49 PM
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Roland Mueck
Glad to hear that fixed your problem.
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'01 F-250 Lariat CC SB 4x4, DP Tuner F6 (live tuned), AFE II w/ Pete's Cover, GTP38R w/ RR billet whl & cross drilled 1.0, 6.0 Techni-cooler, Full Force SS Injectors, Stealth HPOP, Fluidampr, Melling M-208, Walbro FP, mueckster Reg Return & Bowl delete, Comp Cams 910's, mueckster 4R100, 4" SS MBRP, 6.0 Trans Cooler, Truetrac rear ...SOLD...
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Old 02-07-2010, 01:21 PM
Dieselthree Dieselthree is offline
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Vacuum Pump failure

I have 2001 7.3 liter turbo diesel E-350. I have replaced the vacuum pump 4 times over the last four years. What causes the pump to fail?
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  #14  
Old 02-07-2010, 01:27 PM
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What did fail?
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Old 02-07-2010, 01:39 PM
Dieselthree Dieselthree is offline
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pump starts to make a lot of noise. Lose pressure on brake pedal. The first press on the pedal has some pressure. The second has almost none. I have had it replaced at two different dealers hips and two different independent shops.
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Old 02-07-2010, 01:39 PM
 
 
 
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