Brake Problem - Vacuum pump - how to test? - Diesel Forum - TheDieselStop.com
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post #1 of 15 (permalink) Old 05-21-2007, 11:23 AM Thread Starter
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Brake Problem - Vacuum pump - how to test?

My brakes are not working @ low rpm's and I want to test the vacuum pump. Just want to know how, also it might be the power booster and I would like to know how to test if there is a vacuum leak in that.

'97 F350 Crew Cab, 4x4
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post #2 of 15 (permalink) Old 05-21-2007, 12:57 PM
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Re: Brake Problem - Vacuum pump - how to test?

Hook up a vacumn gauge on the manifold on the drivers fender, should be about 20 in.

Is your "Brake" light coming on? usually happens when a pump is weak.


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post #3 of 15 (permalink) Old 05-21-2007, 04:22 PM Thread Starter
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Re: Brake Problem - Vacuum pump - how to test?

Yes the light is going on, should I just replace the pump?

'97 F350 Crew Cab, 4x4
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post #4 of 15 (permalink) Old 05-21-2007, 06:33 PM
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Re: Brake Problem - Vacuum pump - how to test?

No,do a search and do the hydroboost conversion..$264.00 from autozone for the hoses and booster. Better brakes for another $150.00

95 CCLB 4X4, DP, TYMAR, Adeneline HPOP, 5POS CHIP, 4",3 GUAGE POD, 129k, 265/75/16 bfg E, E4OD,4.10s,Putnams hitches front and rear,Air bags rear.Banks IC
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post #5 of 15 (permalink) Old 05-21-2007, 06:54 PM
 
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Re: Brake Problem - Vacuum pump - how to test?

How are you guys swapping pullies from the old pumps to the new ones? Are you using a pulley puller then a hydraulic press to press the pulley on the new pump?
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post #6 of 15 (permalink) Old 05-21-2007, 06:57 PM
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Re: Brake Problem - Vacuum pump - how to test?

It is easiest to get the puller set,,,maybe autozone?....

Rick.....
97 F 350 ...Lucky 13
"Most stuff's just stuck & needs hittin with a hammer .Supporter/End user of ShiftSolutions THE CURE E4/4R Trans Control. Helping Cancer patients and families
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post #7 of 15 (permalink) Old 05-21-2007, 09:47 PM
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Re: Brake Problem - Vacuum pump - how to test?

I used 2 pry bars in the bench vise. and a deadblow mallet. tried using a puller but none were small enough to grab the hub in the center and i didnt want to bend it from grabbing the outside edge.

97 F-350, 3" 2 piece downpipe, open air intake, 6 pos. chip from black cloud diesel.com, 4 in. straightpipe exhuast.
NOW WITH 2'nd rebuilt tranny in 3000 miles.
+new vac pump both at 245'000 new starter at 249'000
have since crossed the 250'000 mark , 253 and still gettin up.

Since killed by a red light running durango.
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post #8 of 15 (permalink) Old 05-22-2007, 11:22 AM
 
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Re: Brake Problem - Vacuum pump - how to test?

[ QUOTE ]
It is easiest to get the puller set,,,maybe autozone?....

[/ QUOTE ]

Is this a three jaw puller set? How are you pressing the pulley onto the new pump? I don't want to ruin the pulley or my new pump. Thanks.
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post #9 of 15 (permalink) Old 05-22-2007, 07:07 PM
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Re: Brake Problem - Vacuum pump - how to test?

It's a puller made especially for the pump, It also fits water pumps on cars, power steering pumps, ect...

It comes with the nessesary tool to press it back on...

Well worth having...

Rick.....
97 F 350 ...Lucky 13
"Most stuff's just stuck & needs hittin with a hammer .Supporter/End user of ShiftSolutions THE CURE E4/4R Trans Control. Helping Cancer patients and families
Special thanks to RacerX USA

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post #10 of 15 (permalink) Old 05-22-2007, 07:23 PM
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Re: Brake Problem - Vacuum pump - how to test?

[ QUOTE ]
How are you pressing the pulley onto the new pump?

[/ QUOTE ]

The pump's shaft is tapped, 3/8-16unc. Using washers and a 3/8 bolt, press on the pulley. When the bolt bottoms out, stack up more washers or go to a shorter bolt. Dont forget to drop in that pump mounting bolt before you press on the pulley.

Randy
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2005 F-250 King Ranch * 4X4 * 4" exhaust / 5" tip * Let the mods begin......

1994 F-250 Super Cab * 4x4 * ZF-5 * 3:55 * RDS Single Shot Stage I's* TDP 6pos chip * BDP electric fuel * BDP D-66 Turbo * IDM Mod * Hypermax 3x4" dp * Authentic Tymar intake* 7.3 Intercooler * gutted ebpv * 4" exhaust & 5" tip * LUK clutch * A-pillar pod w/ Auto Meter NV boost, pyro and water temp gauges * reverse dash lighting and hvac controls * Optima yellow top batts D75/25, both on the right side * HPO X-over mod * manually controlled gp's * cruise control mod * add-a-leaf (front) * AC mod
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post #11 of 15 (permalink) Old 05-22-2007, 07:45 PM
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Re: Brake Problem - Vacuum pump - how to test?

I used to use a longer bolt with a nut threaded on it, tighten the nut against the washers until the pulley is seated .... works great in a pinch...

Rick.....
97 F 350 ...Lucky 13
"Most stuff's just stuck & needs hittin with a hammer .Supporter/End user of ShiftSolutions THE CURE E4/4R Trans Control. Helping Cancer patients and families
Special thanks to RacerX USA

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post #12 of 15 (permalink) Old 05-23-2007, 12:03 AM
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Re: Brake Problem - Vacuum pump - how to test?

I have the same problem. Replaced the pump and it helped a little, but the brakes are still not great. I am now thinking the booster is bad or maybe a vacuum leak?

95 x-cab 4x4 AT LWB bone stock
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post #13 of 15 (permalink) Old 05-23-2007, 12:06 AM
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Re: Brake Problem - Vacuum pump - how to test?

I got my hydroboost stuff today. I'll let you know how much better it works once I'm done.

95 CCLB 4X4, DP, TYMAR, Adeneline HPOP, 5POS CHIP, 4",3 GUAGE POD, 129k, 265/75/16 bfg E, E4OD,4.10s,Putnams hitches front and rear,Air bags rear.Banks IC
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post #14 of 15 (permalink) Old 05-23-2007, 01:31 PM
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Re: Brake Problem - Vacuum pump - how to test?

I haven't gotten around to researching further but when my last vacuum pump went out there were metal shavings all around the pump and on the hose. Since replacing I have an occassional hissing on first start up that goes away after hitting the brakes. My climate control also acts up when going from vent/heat/defrost/ac etc. Both problems began immediately after the failure. I'm wondering if I got metal shavings in the vacuum hoses somehow. Just a theory and maybe a very poor one but figured I'd toss it out.

'94 F350 4x4 PowerStroke, 5-speed, 4.10 gears, crew cab, XLT, Luk Clutch, ZF-47, Hydroboost, AIC, Max A/C Assist, 95.5 radiator and degas bottle 318,000 miles

'96 F350 4x4 PowerStroke, auto, 4.10 gears, crew cab, XLT, DRW conversion, AIC, 502,000 miles

'02 F350 4x4 PowerStroke, 6-speed, 3.73 gears, crew cab, XLT, DRW, AIC, 223,000 miles
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post #15 of 15 (permalink) Old 05-15-2017, 04:07 PM
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i got about 17 in Hg coming straight from the pump does that sound like i need a new pump?
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