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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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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, 08:19 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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RICK, PAA MEMBER #4
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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  #5  
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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Roland... '01 F-250 Lariat "Big Red" CC SB 4x4, DP Tuner F6, AFE II, Modified GTP38R, Banks 6.0 CAC, Full Force SS Sticks, Stealth HPOP, Fluidampr, M-208, mueckster 4R100 & Fuel System, Comp Cams 910's, 4" SS MBRP, Truetrac, 6.0 Trans cooler ....Gone, but not forgotten
'13 F150 XLT "Bubba" Supercrew 4x4 5.0 SB Texas Edition Tuxedo Black... mods have begun
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  #6  
Old 02-01-2010, 08:28 AM
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Quote:
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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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, 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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Roland... '01 F-250 Lariat "Big Red" CC SB 4x4, DP Tuner F6, AFE II, Modified GTP38R, Banks 6.0 CAC, Full Force SS Sticks, Stealth HPOP, Fluidampr, M-208, mueckster 4R100 & Fuel System, Comp Cams 910's, 4" SS MBRP, Truetrac, 6.0 Trans cooler ....Gone, but not forgotten
'13 F150 XLT "Bubba" Supercrew 4x4 5.0 SB Texas Edition Tuxedo Black... mods have begun
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  #9  
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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Roland... '01 F-250 Lariat "Big Red" CC SB 4x4, DP Tuner F6, AFE II, Modified GTP38R, Banks 6.0 CAC, Full Force SS Sticks, Stealth HPOP, Fluidampr, M-208, mueckster 4R100 & Fuel System, Comp Cams 910's, 4" SS MBRP, Truetrac, 6.0 Trans cooler ....Gone, but not forgotten
'13 F150 XLT "Bubba" Supercrew 4x4 5.0 SB Texas Edition Tuxedo Black... mods have begun
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  #11  
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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Roland... '01 F-250 Lariat "Big Red" CC SB 4x4, DP Tuner F6, AFE II, Modified GTP38R, Banks 6.0 CAC, Full Force SS Sticks, Stealth HPOP, Fluidampr, M-208, mueckster 4R100 & Fuel System, Comp Cams 910's, 4" SS MBRP, Truetrac, 6.0 Trans cooler ....Gone, but not forgotten
'13 F150 XLT "Bubba" Supercrew 4x4 5.0 SB Texas Edition Tuxedo Black... mods have begun
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  #13  
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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  #15  
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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