vacuum pump capacity

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Does anyone know if the vacuum pump that supplys vacuum for the brakes and accessories on "95" trucks can handle a vacuum-over-hydraulic brake system. This is on my backhoe trailer. My concern is that I might run out of brakes on the truck and trailer.

Not a pleasant thought.

Does anyone have any experience here?
Thanks, Ronnie

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"95" 3500, 4WHD, Ext cab. SLT, 5 spd, 4. 10 LSD, Rancho 9000's PacBrake, running boards, Mopar mud flaps, 35000 LB. gooseneck ball on home engineered attachment system, , pulling a 6,000 lb. three axle backhoe trailer, hauling a 14,000 lb. hoe,or a 6,300 lb. King 4 horse inline trailer (total loaded weight; 11,300)

1970 340 Duster, 4 spd, 3. 55's, 1968,318 factory air Barracuda convertable. .

 

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Ronnie,

Back in the days before medium duty trucks had 4 wheel disc brakes with hydraulic boost, we installed an extra vacuum reserve tank on the truck and a vacuum gauge when rigging out a truck to tow an equipment trailer such as yours. It would take longer to get the vacuum pumped down before starting out, but it gave you much more reserve when braking. Also with the gauge you would know if you were getting into trouble.

I have found that the vacuum over hydraulic brakes superior to the electric brakes on heavily loaded equipment trailers such as yours. The main problem with the vacuum-hydraulic is that people wouldn't keep the brake shoes adjusted.

Bill

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97 3500CC,Auto,4. 10LSD,All Options incl Leather,Pyro,Boost,Trans. Temp Gauges, PacBrake, 3 pos TC Lockup Switch, RPM 40Gal. Aux. Fuel Tank, Reese 20K Hitch, Highway Products Tool Box, 80% Towing 12,100lb. HitchhikerII 5'er. 2000 3500QC 6 Speed,4. 10LSD,SLT+ on Order since 9-28-99, Built 12-01-99, On Train, Passed Guthrie, OK, 12-6 @4:39AM, ETA Alliance(8 miles from my house),TX, 12-7 2PM

 

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My brother in law has the vac/hyd brakes on his truck and had it for several years GREAT brakes will slide the dual tandems even loaded. Not sure what type kit that he used as I have seen it a couple of times when working on his truck there are two hoses that run from the control under the hood to the connectors in the bed,great system and yes the vacum pump is large enough or I think you would have brake fade. Hope this helps some if not let me know for mor detail as I'll call Tom.

 

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Bill and ramman, thanks for your response. The local trailer business wanted to install a new pump and controls to the tune of a couple of thousand $'s (labor included). Being the type that always thinks I can do it myself, I'm looking at alternatives. I had considered a reserve tank, but, Bill you are right, a gauge would let me monitor vacuum reserve and take appropriate measures. I sometimes suffer from the dreaded slow brain illness. Had not considered the now obvious guage. Thanks.

ramman, if you do have an opportunity to check with bro-in-law I would be most grateful. Thanks

Ronnie


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"95" 3500, 4WHD, Ext cab. SLT, 5 spd, 4. 10 LSD, Rancho 9000's PacBrake, running boards, Mopar mud flaps, 35000 LB. gooseneck ball on home engineered attachment system, , pulling a 6,000 lb. three axle backhoe trailer, hauling a 14,000 lb. hoe,or a 6,300 lb. King 4 horse inline trailer (total loaded weight; 11,300)

1970 340 Duster, 4 spd, 3. 55's, 1968,318 factory air Barracuda convertable. .

 

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Me too. I have a home built trailer with hydro brake sysytem and would like to utilize them if possible. Let us know how he did it.

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'99 2500,4x4,QC,LWB,3. 55 lsd , 5 speed,K&N, Rhinoliner, 265/75/16 Michelins, muffler and resonator removed, Amsoil, Brushguard, step bars, hideaway 25k gooseneck ball, flame red with agate interior. Looking to get really BOMBed!!! CM Texas

 

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I'll call Tom tonight for some info on the hit and the source and try to post as soon as possible.

 

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FYI called tom tonight and he didn't remember the brand but that the kit was $350-$400 range and that a friend of his had purchassed a kit for a power joke and had to buy a vacum pump also as there's no provission in stock ford . I have the phone number of the local buisness that it came from and you my give them a call for the correct info TRAILER PARTS/SERVICE1-502-839-9350 FAX 502-839-9364 Sorry I couldn't help more if ya can't reach them let me know as I will try to assist you. Tim