Vacuum pump for Brake Booster - LOL

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A

abdulr76

Joined
Jul 12, 2010
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4
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Hi,

(You are going to read something weird :idea:, do criticize but with suggestion, I know I can do it in a much simpler way but I want to have your valuable feedback on the idea)

I would like to ask one question regarding vacuum pump application for Brake Booster.
I am running a Diesel truck (UNIMOG U600) and want to install brake booster for improved braking, the engine has no external or internal vacuum port or pump to operate vacuum assisted brake booster. In this situation, I decided to install mechanical oil drive external vacuum pump but unfortunately, the pump needs oil input and return line which again needs some modifications and difficult to install in compact engine room, after all this modification, I am thinking to revert because it does not appealing too much. Finally, I decided to install a Dry vane vacuum pump with a 12v/24v DC drive motor to produce vacuum for (Nissan - Double Diaphragm) brake booster, now, I need to understand some maths to make it successful and operational.
I have selected ORION (JAPAN) KHA400 Dry vane vacuum pump, it requires 1,430 ~ 1,745 RPM to create continuous vacuum and has propeller fan for cooling.
So the vacuum pump will be coupled with 1,600 RPM, 12v/24v DC motor, and I will also add a vacuum reservoir tank with low vacuum switch, which starts the vacuum pump under low pressure conditions. I will highly appreciate your responses on the topic.

Regards,

Abdul.
 
Thanks Blis,
The Question is: it will work or not, if yes what the challenges I am going to face with this setup. Need more brains to think about its upside and downsides. Life of dry vane vacuum pump, things which are not in my mind please someone highlight.
 
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Alright...

For starters I do know that they're building electric hilux at my university and they're using 12V vacuum pump in it to power the brake booster (didn't notice any oil lines so I assume it is dry vane). So far they haven't had any problems with it... Considering you're planning on using the vacuum just for brake booster I imagine that 5 liter tank should be enough vacuum for several pushes on the pedal, maybe 20l/min output for the pump so it would take only 15 secs or so get full vacuum...

Wire it properly trough fuses and use big enough wires, if you're going to use simple pressure switch it might be worthwhile to wire it trough relay. Also, I would add manual override/shutdown for the pump just in case...
 
On late model diesel Isuzu NPR trucks ('99+), they have an electric vacuum pump to supplement the engine-driven pump on the back of the alternator along with a tank and vacuum switch. The US versions are 12V but it may be possible to find an overseas model that is 24V. You might be able to find these in a junk yard. The electric pump is inside the cab behind the instrument cluster and the tank is located below the floor board on the driver's side.
 
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Orion Dry Vane Vacuum Pump pics, waiting for motor. I found few motors but need to install PWM circuit to lower speed to 1600 RPM.
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Work in progress

Hi All,

Thanks for your advices, I finally coupled the vacuum pump with DC Motor and got desired result. I attached a Toyota Coaster Vacuum tank to retain vacuum for reasonable period of time. The pump completely vacuum the tank in 30 second and maintains 8 In Hg Max.

Now the automatic start and stop mechanism will be introduced to the vacuum pump motor, which will be with the help of SMC ISE30 Pressure Switch. The switch has a min and max preset values in MPa and will trigger ON or OFF function with the help of Power Relay. Without ON/OFF function the pump motor will put unwanted load on Batteries and lower the vacuum pump life, so there is no reason to leave it turn ON all the time. Again it needs calculation and lots of work and testing......

Please post your suggestion.

Thanks & Regards,

Abdul.

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Unimog should brake fine, it is made for trailers.
Once went to buy one but made the mistake to take my wife with me... :princess: :bang:

Are you sure the rubber brakelines are not jammed when rubber flakes inside come loose, and the fluid is new?, cylinders are all loose and moving out? or rebuild to disk brakes, it sounds like the brakes system is not working properly.
I dont know if you have unimog parts nearby:
This is a dutch site, just for pictures: http://www.unimogspecialist.nl/nl/onderdelen/

Do you have the manuals?
german, brake adjustment: http://www.google.nl/url?sa=t&rct=j...dXSmDkOvG5MK_iA&bvm=bv.74649129,d.ZWU&cad=rja

pictures of disks, firefox or other should translate pretty good:
http://www.unimog-community.de/archiv/index.php?name=PNphpBB2&file=viewtopic&t=74603

A booster might be to much as these trucks allready need a lot of maintenance, I am just to lazy for extra work :clap:
 
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