Author Topic: ABS Pump Bleed Process with VCDS, needed or not?  (Read 362 times)

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Offline robh

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ABS Pump Bleed Process with VCDS, needed or not?
« on: January 15, 2020, 02:23:17 pm »
Read many threads on many sites some saying ABS Pump Bleed is required if air has got into it, others stating it isn't required.  Anyone know for sure?

Also anyone have a definitive VCDS procedure for doing it?

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Offline 80 Vert

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Re: ABS Pump Bleed Process with VCDS, needed or not?
« Reply #1 on: January 15, 2020, 07:35:44 pm »
I've only needed to use vcds for it once.
I put an air fitting in an old reservoir cap and put 5-7 psi air pressure  on which completely eliminates pumping the pedal.
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Offline McDoof

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Re: ABS Pump Bleed Process with VCDS, needed or not?
« Reply #2 on: January 16, 2020, 10:34:01 am »
as per the above, to set the pressure.
I just used one of these with an Aliexpress pressure gauge to bleed my last car. Cheap and easy
https://www.thewarehouse.co.nz/p/kiwi-garden-pressure-sprayer-5l/R1290755.html
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Offline Worms

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Re: ABS Pump Bleed Process with VCDS, needed or not?
« Reply #3 on: January 16, 2020, 11:53:54 am »
My "Brake bleeder" was only $7 at savebarn :laugh:

I ran the pressure higher, and also the VCDS function on my MK60 unit, but it had been disconnected from the car a while. I didn't go as high as VW recommends with pressure for the MK5 though.

I don't think they bleed function helped the feel at all, so was probably completely un-needed.

There are some places in the ABS that air can hide... but it's not likely to have air in it if it's been on a car already.

Totally dry pumps may have some air between valves and fluid paths that aren't usually open and may require the procedure to totally remove it. A used pump should still have it's old fluid in these areas which will soon escape with some "spirited" driving/braking  >:D

Offline robh

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Re: ABS Pump Bleed Process with VCDS, needed or not?
« Reply #4 on: January 17, 2020, 09:38:09 am »
Any thoughts on what symptoms would point to needing to specifically bleed ABS pump?
Daily Driver - VW Touareg V8 TDI 2012 "towing beast"
Too Many Cars - Lotus Elise S 2013 "tangerine dream"
Fun Car - Vento 1.8T "bought not built"
Project Car - Golf VR6 Turbo "built not bought"
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Offline 80 Vert

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Re: ABS Pump Bleed Process with VCDS, needed or not?
« Reply #5 on: January 17, 2020, 02:13:48 pm »
Squishy pedal. Can be air in MC as well, MC has / should have bleed nipples on it also.
2010 T5 Transporter TDI  Tuned by Superior Tuning NZ
2003 Jetta Coupe soon to be R36TT
1963 Type 34 Karmann Ghia, turbo 2.0
1990 Porsche 964 911 Carrera 4
1980 1303 Beetle vert, under restoration