Vacuum pump will not stop.

[iceblue]

Now that I have my car running. It's time to sort out all the bugs, there are plenty


The vacuum pump will start as soon as I turn the key.
I am not sure why, also have brake issue that we need to sort out. Issues like brake pedal being too soft.
We have a newly rebuilt brake booster and master cylinder. We bled the lines 3 times and found some air inside the lines.
The soft pedal with almost no brakes and the vacuum pump running constantly tells me that there might be a leak?

Has anyone run into this problem before?

Thanks
Olivier

PS: I am also still looking for a resistor for my water gauge if anyone comes across one please let me know.

[Guzzi]

Olivier, the vacuum pump and soft pedal are two separate issues I think. Disconnect the pump and then try to get a pedal. Also be aware that some dual circuit brake systems require a specific sequence e.g. my Volvo 144S. Did you 'bench bleed' the master cylinder before installation?

The pump is only meant to be a top-up so maybe it needs more time to pull a complete vacuum? Otherwise if the vacuum pump is running constantly certainly indicates either an air leak or a faulty sensor.

I'd suggest any electrical parts store can provide a resistor to your specification. It may be solid state instead of a coil but should do the same job and you can hide it in the blue tube. (BlueTube - youtube for adult content?) NB it must be the correct value or the gauge will not read correctly

Peter

[iceblue]

Made some progress in isolating some areas where I could perform some vacuum test on parts of the lines.
I disconnected parts the lines and made sure that my clamps were nice and tight. I manage to hold a 15 lbs of pressure from the pump to the tank.
I then test the line a the banjo fitting near the firewall to the brake booster. I then noticed that our new vacuum reinforced stainless steel hose from supplied by superformance did not have a perfect clamping at either ends.
I got larger clamps and heavy duty seal silicone to help close any potential gaps.

I decided to take apart the vacuum pump.
Replace the de motor seal 1022 " 10 MM inner diameter 22 MM outer diameter.
Here are some pictures. of the impellers, have a look at the position of the offset and the 4 extendable rubber impellers.
Pretty cool, high speed spin sucking air out of one hose and expelling it out into another hole.

It is very important to place this pump at an angle so that no OIL will back flow into the vacuum lines.

[Guzzi]

Olivier, nice work.

I suggest you send the faulty hose back to Superformance ASAP. They've been having quality issues from third party suppliers for some time