Anyone know the correct brake bleed order for octavia 3 2l 150bhp diesel?

 

Nearest search was octavia 2

Which suggested front left front right then rear left then rear right

Normally I d do rear left rear right then front left and front right.

 

Quick replies appreciated.  My next job after engine oil.

 

Thanks

PS any brake fluid nipples other than on calipers that would benefit from bleeding :-) 

 

 

Edited 2 September, 20187 yr by bmbmdmb

I hazzard a guess and say furthest away form the master resaviour then the nearest. 

Me too, but the Octy 2 link is very different to norm.

The bleeding sequence is listed in the Skoda ErWin maintenance manual. It is not what you would think, more importantly it has the correct pressure if you are using a pressure bleeder.  Before you go messing with the brakes on a modern car you really need the info from the horses mouth not guesses from a forum. 

 

There is a link in one of the stickys to some old manuals but a tenner on ErWin will get the correct info for your chassis number.

 

These machines are more complex than they look and what used to work doesn't always work now. As the info is so readily available no excuse not to have it in my book, especially when you are playing with brakes.

^^^ This. I would add that the ABS unit needs have it's valves modulated to bleed the system. Last time I checked it was £38 at my Skoda dealer to have the fluid changed. Pretty cheap for the peace of mind.

Never mess with modern brakes unless you know exactly what you are doing.

I have a pressure bleeder and compressor. Not had an issue after doing various manufacturers and models and my Fabia. This is not the first time. I am considering vcds for that reason ...to bleed abs unit. Although no air locks, just to refresh the fluid. On the Fabia workshop manual I have the bleed machine looked like it was pressurized at the brake fluid reservoir, screwed in place as well as pulling fluid at tube bleed valve. 

 

I ll look into erwin when I am at computer with good internet connection. Are unlimited files downlodable or for pay once for one model? 

Just found the sticky. Thanks

 

 

 

Hello from Sweden!

 

I was attempting to do this service myself but i gave up because of the confusion about different bleeding orders in different workshop books. Skodas Workshop Manuals sequence is rr,rl,fr,fl but the Erwin says fr,fl,rr,rl . I will leave it to Skoda dealer to fix it. Another problem i had was to get the airfilter housing of,( to bleed the clutch slave cylinder)  i managed to free airbox from all hoses,clips...But I couldnt lift it up..Doesnt worth damaging it before i know better...

Order really doesn't matter much in my opinion. 

1 hour ago, BerkCo said:

Skodas Workshop Manuals sequence is rr,rl,fr,fl but the Erwin says fr,fl,rr,rl . I will leave it to Skoda dealer to fix it.

 

There is often more than one correct sequence to bleed the corners, it depends on the internal layout of the ABS unit. There can also be a difference between LHD and RHD cars.

 

If you use the wrong sequence you can end up pushing air around in the unit instead of flushing it down to a wheel bleeder

 

56 minutes ago, Wino said:

Order really doesn't matter much in my opinion. 

 

Glad you are not bleeding my brakes then 

1 minute ago, flybynite said:

 

If you use the wrong sequence you can end up pushing air around in the unit instead of flushing it down to a wheel bleeder

From where?

4 minutes ago, Wino said:

From where?

 

???

1 hour ago, flybynite said:

 

???

I thought it was a simple question, but let me elaborate.

 

Where do you think this air would be coming from, in order to be 'pushed around in the unit' by bleeding in some wrong order?

 

As far as the info from @BerkCo reads to me, he/she is trying to change the brake fluid: "do this service myself", rather than to remove air from anywhere. therefore there is no air in the system at present, to be pushed around anywhere.

 

7 minutes ago, Wino said:

Where do you think this air would be coming from, in order to be 'pushed around in the unit' by bleeding in some wrong order?

 

You bleed the brakes for many reasons, one of them is air in the system or a new component with air in it. OP did not specify what he was doing.

 

Even if is under the correct pressure the moment you release the bleeder air can enter round the bleeder thread and (as I guess you know) the bubble will rise in the fluid to the highest point. The modern low viscosity fluids make this worse, bubbles move faster and are more difficult to push air out.

 

If there is no air in the system then for a fluid change you risk pushing old fluid around and contaminating the new fluid.

 

There are procedures laid down in the manuals for a reason that work in all situations but there will always be someone who thinks they know better.

 

 

3 minutes ago, flybynite said:

Even if is under the correct pressure the moment you release the bleeder air can enter round the bleeder thread and (as I guess you know) the bubble will rise in the fluid to the highest point. The modern low viscosity fluids make this worse, bubbles move faster and are more difficult to push air out.

 

If there is no air in the system then for a fluid change you risk pushing old fluid around and contaminating the new fluid.

Aren't pressure bleeding systems supposed to prevent air making it's way back up when a bleed nipple is opened - which is why they are usually recommended?

45 minutes ago, PetrolDave said:

Aren't pressure bleeding systems supposed to prevent air making it's way back up when a bleed nipple is opened - which is why they are usually recommended?

 

Correct in theory but if you do not open it carefully air can get in past the thread as the fluid comes through the centre. Unless you get the correct flow air can get in and travel up.

 

But air can get in anywhere, hardened piston seals, dirt in the seals, that let air in as the get hot and cool.

 

A brake service is also an opportunity to purge the system of this air as well as the moisture that makes its way into the system.

 

Like I say there are correct ways of doing it and there will always be people that think they know better. 

A pressure bleeder prevents air from heading back up the brake line as it effectively mimics how the fluid would act under braking. As long as you push a load of fluid through and no bubbles come out you will be fine 

1 hour ago, Ecomatt said:

As long as you push a load of fluid through and no bubbles come out you will be fine 

 

The problem is with certain ABS units (including those used by Skoda) you have to restrict the pressure. Some you have to cycle the ABS unit which also gives opportunity to get air into the system. Bubbles travel fast in the new-type fluids.

The suggested pressure for doing it as read from @BerkCo's first image is 2 bar... Seems ample to me to prevent any backflow.

 

It would be good to see a German or Czech language version of the erWin info, as the confusion over the bleeding order may be simply translation error?

Anyone from those places with the relevant info reading?

Edited 23 July, 20214 yr by Wino

Hello Guys,

 

Thanks you very much for your replies.  I have a pressure bleeder that i can attach to reservoir and add pressure. i purchased from amazon so there won't be any problems with air escaping in to the system.  I am not going to change any brake lines or calipers. Just renew the brake fluid. 

The second picture i shared is the Swedish Erwin which I obtained with  my chassinumber so it should be the correct. It says: " Bleeding (airing out) order: 

1) Caliper Front Right

2) Caliper Front Left

3) Caliper Rear Right

4) Caliper Rear Left

 

I live in sweden so steering wheel is located on leftside. 

 

Just to add more confusion to the situation. I called another Skoda dealer and asked the mechanic about the bleeding order. His suggestion was to begin from the furthest away from brake fluid reservoir and make your way to the nearest the reservoir. 

 

Once again thanks for all replies! 

Greetings from Sweden! 

3 hours ago, Wino said:

Seems ample to me to prevent any backflow.

 

Backflow is not the problem, a bubble of air can travel against the flow in a pipe that rises from the brake to the M/C or ABS unit

 

Like I say you do it your way ,  I just do it by the book.

 

2 hours ago, BerkCo said:

I called another Skoda dealer and asked the mechanic about the bleeding order. His suggestion was to begin from the furthest away from brake fluid reservoir and make your way to the nearest the reservoir. 

 

It is the way it was mostly done before modern ABS units, most times you probably get away with it, but not the first dealer serviced car I have had with spongy brakes cured with a correct brake bleed.

 

Good luck with it, Is your 4x4 petrol or diesel?

It is 1.6 diesel 😀 

 

If the pressure in the pipe is above atmospheric, then atmospheric pressure air will/can not be drawn in.  Seems obvious to me.

Bye.

 

12 hours ago, Wino said:

If the pressure in the pipe is above atmospheric, then atmospheric pressure air will/can not be drawn in.  Seems obvious to me.

 

FFS why keep on showing what you don't know. Like I said above the air gets in past the threads, venturi effect from the fluid going out the centre and can move up against the flow or when you close the valve. Minimised by doing it at the correct pressure, in the correct order, with the correct equipment.

 

This all started because you said it does not matter what order it is done, sorry it does.

 

I'm done trying to explain engineering to flat-earthers. It is why you should read manuals not forums. I'm done here too