What is the vacuum required (Hg) to operate the brake booster on these cars?

Post by **ThaddeusTheBold** » 25 Oct 2023, 06:24

Hi,

Another electric conversion question here for my 1998 V70.

When I delete the internal combustion engine on my V70, I will also have no vacuum source to operate the brake booster.

So, I need to acquire a 12v vacuum pump, and maybe an accumulator tank. They are expensive! So I don't want to buy more pump than I need, but I certainly don't want less.

In order to size the pump, I need to know how much vacuum the brake booster in my car requires. Does anybody here know?

Thank you,

Thaddeus

Post by **ThaddeusTheBold** » 25 Oct 2023, 09:04

Here is a vacuum pump for a 2006 Volvo S60 turbo. Do you folks think this would work?

https://www.rockauto.com/en/moreinfo.ph ... 5172&jsn=9

Post by **MoVolvos** » 25 Oct 2023, 12:51

.
Our P1 C30 uses a vacuum pump also. I think even our 03 S70 T6 has one. Go to any Volvo Parts Online and compare a heavier Volvo suv vs a car's vacuum pump. If they are the same part you should be fine.
.

Post by **BEJinFbk** » 26 Oct 2023, 16:41

In keeping with the whole “Mathew” theme,
Check out Super Fast Matt on YouTube.
He’s converting an old Jag with Model 3 parts.
He has a couple of videos with conversion
info for power steering and power brakes
using Tesla parts.

And Bonus - Great Channel,

Post by **BEJinFbk** » 26 Oct 2023, 23:45

Ah! Here we go...

Be sure to watch all the way through to learn about
the less expensive Honda option. Forgot about that.

And while we're at it:

All Hail the Algorithm!

Post by **abscate** » 27 Oct 2023, 02:59

You get about 20 inches of vacuum at most on closed throttle overrun, so you don’t need more than that.

Post by **ThaddeusTheBold** » 27 Oct 2023, 04:22

Thanks everyone!