Motive Power Bleeder experience... not 100%..advice needed

[Sirocco20348]

Hey Guys,

I used the motive power bleeder to bleed my brakes today on the MK4 GTI.

I followed the instructions on both the motive bottle and the Haynes manual, but my bleed process was not 100% straight forward.

The problem was with the rear brakes..... even with 10psi of pressure ... the brakes would not drain by themselves... I raised the pressure to the max recommended of 14.5psi... but still no good. I needed to get the wife to push the brake over and over to flush the rear brakes.

Am I doing something wrong? Does something need to be loosened to allow the rears to bleed easier?

The front wheels were no problem and bled by themselves with 10psi.

Any advice would be great. I'm thinking I needed to loosen something somewhere, but it was not mentioned on any documentation I had.

Thanks in advance.

[Transporter]

The pressure should be 30psi (2BAR).
If you using the type of bleeder that just pumps the air into the container with the b.fluid and the air comes in contact with the b.fluid, then you're introducing the moisture from the air into the b.fluid and also the micro bubbles. Certainly not the correct way to bleed the brakes/change the fluid.

[Sirocco20348]

The pressure should be 30psi (2BAR).
If you using the type of bleeder that just pumps the air into the container with the b.fluid and the air comes in contact with the b.fluid, then you're introducing the moisture from the air into the b.fluid and also the micro bubbles. Certainly not the correct way to bleed the brakes/change the fluid.

Woah 30 psi?? Are you sure about this? The Bentley manual specifies a max of 14.5psi?

Im using this pressure bleeder... http://compare.ebay.com.au/like/2306...PriceItemTypes

How would you recommend changing fluid?

[Transporter]

All VAG cars b.fluid reservoirs will handle that pressure with a good margin. I'm using ATE FB30S.

[Sirocco20348]

All VAG cars b.fluid reservoirs will handle that pressure with a good margin. I'm using ATE FB30S.

The ATE FB30S ...lol I am seeing prices of $1500?!!

I sense from your sig and related posts your a professional mechanic.

Interesting to know the reservoirs can handle 30 psi.

[Umai Naa!!]

That's a pretty big investment, Miro.

But definately the best way to go. It's a more advanced setup to the one VW dealers use.

[Transporter]

The ATE FB30S ...lol I am seeing prices of $1500?!!

I sense from your sig and related posts your a professional mechanic.

Interesting to know the reservoirs can handle 30 psi.

From memory, I think its more than 45 psi.

[Sirocco20348]

So back to my original question.

Are you saying that the reason why the fluid was not being pushed out of the rear calipers is simply because I didnt have enough pressure? Or is there something that is blocking the pressure to the rear calipers?

[Umai Naa!!]

I've found with some, you've got to wind the nipple out more than the typical 1/2-3/4 of a turn.