[timthefinn]

Looking around, it looks like Hella has put out a UP5.0 pump that is 73db compared to the UP32's 78db, bit less amperage and better capacity. Problem is, I can't find it for sale anywhere. Anyone seen this thing in the wild yet?

 

[ndplume]

Do these Hella vacuum pumps have an integral vacuum switch ?
What about a check valve ?

Otherwise, can someone recommend a vacuum switch for braking?

 

[oudevolvo]

The Hella UP-28 does not have a build in switch. I initially thought to use the UP-28 but found it quite noisy. After some further research I listed the Ford A426C and the Mes Dea 70/6E2 as alternatives.
I've compared the Hella with the Mes Dea.

The Mes Dea is more silent and I have chosen to use that one.
It has a build in pressure switch.
More details of my comparison and conclusion in my blogpost: Further details of my electric Volvo Amazon wagon
I've not further explored the Ford pump.

 

[favguy]

Out of interest, I discovered the UP-28 is not meant for use as a sole method of vacuum, it's meant as an assister pump in ICE applications. The UP-32 is designed for solo use and is a lot faster to pull vacuum.

That said, I've been successfully using a UP-28 in my conversion without issue for several years now, but I tend to drive quite steady and don't need to use the brakes excessively so it has an easy life!

 

[timthefinn]

The Hella UP-28 does not have a build in switch. I initially thought to use the UP-28 but found it quite noisy. After some further research I listed the Ford A426C and the Mes Dea 70/6E2 as alternatives.
I've compared the Hella with the Mes Dea.

I do want a quiet pump, but I've heard that diaphragm pumps fail over time as discussed in Tim Catellier's post:

http://evz3.blogspot.jp/2013/11/brakes-car-shows-and-solar-power.html

Is your experience different? Do you replace the diaphragm on a regular basis to avoid an in transit failure? The Hella sound levels of some 70db or higher is a bit severe, so am willing to listen to other options.

 

[timthefinn]

Hydrobooster? I already need an electric hydraulic pump for my power steering. If I can trade out my vacuum brake booster for a hydraulic one, I wouldn't need a vacuum pump at all. Anyone try this? Biggest challenge for me is I'm converting a BMW Z3, so conversion kits are probably not off the shelf. Might just change out the whole assembly (booster and master cylinder) but not sure how that'll work with the ABS or car in general.

 

[oudevolvo]

You might also consider an iBooster made by Bosch and for example used by Tesla.
Some info in http://www.diyelectriccar.com/#/topics/170770?page=1 post #11 and a little further some more.
Just apply 12V and you have assister brakes.
In the Netherlands getting it registered with that booster can be a challende (too much changes). So I’m converting to electric with traditional brakes first and perhaps upgrade later.

 

[timthefinn]

Thanks for the lead. Hadn't heard of the iBooster from Bosch. Sounds a little tricky to procure and utilize. Sounds like people have gotten them from parted out Teslas. Do you work through junkers to find that type of thing, or does someone carry them?

 

[oudevolvo]

Yes, they mostly come from parted out Teslas.
I found one listed on eBay https://m.ebay.nl/itm/263303202070
John from Edisonmotors has some available too.
And I found them from a Chevy too https://m.ebay.nl/itm/132156455001

 

[tinkeringgreg]

i know the Oldsmobile diesel 350 V8 engines back in the 90s had a very similar pump that rad all of the vacuum powered devices in the car including the power brakes. it looked like the very same pump unit with a different mount/ drive system. Gm trucks withe the 6.2 diesel had a belt driven one similar to what ford used