Ross-tech Bleeding Issue 9N3

[h100vw]

I'm confused about this.

Are you saying that even if you're just changing the fluid, but not breaking the lines, you shouldn't use the standard left rear/right rear/left front/right front/clutch bleeding sequence? If not, why not for Polos?

Cheers.

VW manual says to do the fronts together with their machine before the rears together. If there's air in the system.

Then for ABS mark 60 systems, front left, front right, rear left, rear right.

Bosch ABS is rear right, rear left, front right, front left.

There's a note about long pedal travel. Which requires a second person. Press pedal and hold, release fluid at caliper until pedal goes all the way down. Tighten bleed screw then repeat 5 times, do all calipers.

Road test and get the ABS to kick in.

Gavin

[Umai Naa!!]

Also check for ABS codes in the CANbus. No fault lights will show up on the dash, but it will make the ABS act up, giving a long pedal, and locking wheels.

[Catfish]

VW manual says to do the fronts together with their machine before the rears together. If there's air in the system. Gavin

Thanks for that. But my question above assumed NO air in the system. I've done it in that sequence several times since I've had the car, with no obvious problems. Am I skating on thin ice?

Cheers.

[h100vw]

Thanks for that. But my question above assumed NO air in the system. I've done it in that sequence several times since I've had the car, with no obvious problems. Am I skating on thin ice?

Cheers.

I can't see a reason to worry.

I haven't done mine per the book either.

Gavin

[Catfish]

I can't see a reason to worry.

I haven't done mine per the book either.

Gavin

Thanks again. Found this explanation of the 'why' for the left front / right front / left rear / right rear sequence - "The newer ABS Mk 60 system has the lines to the front brakes coming off the top of it. Therefore any air in the system is bled out of the controller if you bleed the front brakes first".

Presumably all 9n3s have the Mk 60. Where is the ABS pump located, so I can at least do a visual check before taking this as gospel?

Cheers again.

[Umai Naa!!]

Passenger's side, on the firewall if my memory serves me correct.

[Blue Shell]

Going to try a gravity bleed. Only thing I haven't attempted. Will keep you posted.

[Transporter]

Going to try a gravity bleed. Only thing I haven't attempted. Will keep you posted.

You most likely wasting your time. The pressure bleed is only the way to force the air out of the VAG ABS system.

[Umai Naa!!]

Yep, and even that can take a while.

Also, did you scan the whole car for ABS-related fault codes? LIke I said ealier, it only needs to log a sporadic code in somewhere like the CANbus to throw a spanner in the works.

[Stuwey]

You most likely wasting your time. The pressure bleed is only the way to force the air out of the VAG ABS system.

I'd be intrigued for you to do mine!

[Blue Shell]

Wouldn't running the ABS pump bleed that side of it? Well it's free and if it works I'll be about as suprised as I will be stoked.

[Transporter]

No it wouldn't.

[Transporter]

I'd be intrigued for you to do mine!

I wouldn't spend $2800 for the pressure bleeder if there was other reliable way of changing the brake fluid or bleeding the air out of the brake system. Yes, even changing the brake fluid you have to use the pressure.

[Stuwey]

I might be in contact in the not-too-distant future then!

[Transporter]

I might be in contact in the not-too-distant future then!

No worries.