Hydroboost or Vacuum pump

[cobradriver427]

I have both a hydroboost and a vacuum pump which one is better, I was sort of thinking the hydroboost because it will be more out of the way. Any thoughts would be appreciated.

[Driverswanted]

I started with vacuum assist and was not happy with my braking while handling a 7,000 lb. load. I switched to hydroboost and to a smaller diameter master by 1/16" and it's made a world of difference. The smaller master requires a little more pedal travel but there was plenty of distance between the pedal and floor when depressed. Filtering is recommended on your brake /steering fluid line.

[cgarr011]

I need to run a vacuum pump for my climate controls. if you dont have any other vacuum accesories, i would go hydroboost. if you would like to part with your vacuum pump, let me know.

[Jakey]

I need to run a vacuum pump for my climate controls. if you dont have any other vacuum accesories, i would go hydroboost. if you would like to part with your vacuum pump, let me know.

Lots of vehicles have factory electric vacuum pumps that run the HVAC and or cruise control.
With the knowledge of how to wire them up, you won't need the mechanically driven pump.

[Diesel Durango]

I started with vacuum assist and was not happy with my braking while handling a 7,000 lb. load. I switched to hydroboost and to a smaller diameter master by 1/16" and it's made a world of difference. The smaller master requires a little more pedal travel but there was plenty of distance between the pedal and floor when depressed. Filtering is recommended on your brake /steering fluid line.

how do you like your 190's with that much of a load? I have an HX35 and 12cm non-wastegated exhaust housing already.

edit: sorry to hijack.

as to the hydro/vacuum debate: I went with the vacuum pump because it simplified my install since my durango had vacuum boost brakes and vacuum actuated cruise control.

[Driverswanted]

The 190's worked fine with the load. I rotated the stock injectors back in until I have time to clean up the 190's. I ran too retarded for a while and sooted them up. Not sure how different they are yet since I never used the stock injectors until now. I do, however get the same boost under heavy load.

I forgot. I also have a Ferd diaphram vacuum pump for climate controls. It was a lot of work installing it in the beginning on the serpentine belt of my project but now it only feeds the climate controls. Yah. and electric with maybe a reservoir would be all one needs for the climate controls.

[cgarr011]

I have breifly looked at the electric pumps and they were expensive but i am sure it was more vacuum then i needed for just climate controls if i switched over to hydroboost. I am with DD, i was hoping that the vacuum pump would simplify the install.

[my96z]

I started my project with the Vacuum pump and booster. I am not happy with the way the vacuum system works any more. I don't pull anything but when I go off roading it feels like I don't have enough brake power when playing on the rocks. I have a Hydroboost system coming for my TJ Jeep and also a small 12v vacuum pump so I can still control my Climate Controls. I will post when all that is done..

[Grigg]

Vacuum pumps suck.. (pun intended)

I really like the two hydroboost systems I have put together, but I have not needed vacuum for anything either. Even if I did need vacuum for something I would deal with that as a separate issue, and stick with the hydroboosted brakes, they are much better.

Can you convert to manual heater controls?

There are electric cruse control units out there, http://www.rostra.com

Someone has to have a small cheap vacuum pump just big enough for the heater stuff if you have to go that way??

Grigg

[Ggg]

Ford has used small electric vacuum pumps on all sorts of their cars and trucks. The PSD Super Duties have a small electric vacuum pump and reservoir. I am sure other makers have done the same too.

[Driverswanted]

One on ebay.
http://cgi.ebay.com/ebaymotors/MP-Br...spagenameZWDVW

[boots4]

Ford has used small electric vacuum pumps on all sorts of their cars and trucks. The PSD Super Duties have a small electric vacuum pump and reservoir. I am sure other makers have done the same too.

Are you talking about this guy? It's for a PSD. It'll pull about 30 inches and was very easy to hook up, just a 12v + and a -.

[Diesel Durango]

is there a part number?

[Jakey]

The left pump in this pic is from a Volvo, it looks just like the pump used on 1999+ Powerstroke Fords.

The pump on the right is from a foreign car, I got it from a Nissan, they can be found in lots of foreign cars and minivans.

[boots4]

is there a part number?

Looks like you can see the part # in this pic. I had a shop order it for me and got decent price ($95).



6C3Z 2A451 A

hey Yakk, I'm assuming those came from a salvage yard, could you share what they cost?

[cgarr011]

that ford pump sounds like the ticket, did it produce vacuum for the brakes in the ford or just accesories?

[Ggg]

Just the accesories, heat, etc. The SD trucks with the PSD engine have hydroboost brakes.

[Ggg]

Are you talking about this guy? It's for a PSD. It'll pull about 30 inches and was very easy to hook up, just a 12v + and a -.

Yes that it it boots thanks for the picture.
I ran the part number and it goes for around $107.

[studedude]

I wonder if that little dumplin' would power up vacuum wipers? Probably not but it's cheaper than converting to electric wipers. I read on a hydroboost companies website that you could not use a hydroboost system with all drum brakes. Does anybody know if that is true and why if it is?

[Grigg]

I read on a hydroboost companies website that you could not use a hydroboost system with all drum brakes. Does anybody know if that is true and why if it is?

Mostly true, but some exceptions.
In a small vehicle with disc brakes and a hydroboost the brakes seem to be very touchy, and try to grab. I could be wrong, but it is because they are self energizing (unlike disc brakes) and take less pressure to operate, the hydrobooster is just a little to strong.

I had a medium sized dump truck with factory drum brakes and a hydrobooster, that worked fine, and many trucks were built that way, and may still be.

This explains it all,
http://hydratechbraking.com/forums/v...ht=drum+brakes

Grigg

[Diesel Durango]

thanks for the information and part numbers!

[sailed2japan]

My C3500 has a hydroboost set from the factory and I'll never install anything but that in a vehicle that I would be towing with. My truck will stop it's 6500lb weight and a 10,000lb trailer on a dime... I guess that could be helped by it's 6 tires, though...

[jtamulonis]

If the brakes are too sensitive on the front you can use wheel cyl`s with 1/8" or 3/16" smaller pistons. they will speed up the shoe to drum contact and lower the applied force to the shoes. the hydro boost will still have plenty of pressure to lock-up the brakes if needed. You may have to experiment with different w/c diameters to get a balanced system. You`ll always have plenty of reserve power with the hydroboost over a vaccum boosted system.

[studedude]

Thanks, have a cold one on me. I figured there had to be a way to work it out as they used power assist brakes on some pretty heavy vehicles in the past. So, some way of decreasing the applied pressure to the brake shoes should do the trick. Grigg, this is on the 1.5 ton 53 Stude so it is not real light even though it has a flathead six in it! And I think that electric vacuum pump should operate the wipers quite nicely.

[beck]

There are a lot of vac pumps available in the salvage yard. VWs of the 80s with cruise. A lot of the 80s GM cars. (Look under the front of the front fender). Newer P30s and motor homes have them. I am a salvage yard kind of guy. (Read that cheap)
I recently ran into the vac problem with the climate control also. I am adding an aftermarket ac system. Most of them have vac control. I found one that is all electric (no vac). I will spend a little more time on the install and have all electric so I don't have to mess with the vac pump now or in the future.

[IHWillys]

I've read cautionary tales when powering up an older non-power drum brake system. It seems that the drums may not take too kindly to the extra force trying to push the shoes through the drum. Realize that drums distort out of round under braking, and that there is a limit somewhere in there. Just another point to consider when dealing with modifying brake systems.

Ken