So my rear piston won't wind in. I have the tool and had removed the caliper from the car.

 

Now the piston screws in fine when the O ring(or I think it's actually called a square seal even though it's round) seal is removed and I've cleaned the bore and groove where the seal sits thoroughly but no change. The piston still will not wind in at all the seal is causing to much resistance/friction.

 

I've ordered a new seal but the current seal looks ok it doesn't looked damaged or distorted.

 

But then these are fine fits so maybe a new seal will sort the problem, I'm kind of doubting it will but I can't see any other option and it's obviously the seal that's preventing the piston winding in.

 

Any ideas?

Apply a smear of rubber or silicone grease to the piston and it'll slide in, alternatively use brake fluid but wash off afterwards with brake cleaner or alcohol to prevent a crusty build up.

42 minutes ago, MicMac said:

Apply a smear of rubber or silicone grease to the piston and it'll slide in, alternatively use brake fluid but wash off afterwards with brake cleaner or alcohol to prevent a crusty build up.

 

Thanks.

 

Could you answer this next question.

 

Why is it that there seems to be two different sizes for at least several parts for my car for example when searching by REG various sites like EuroCarParts tell me I need a 38mm caliper yet when I measure the caliper with digital Vernier calipers, it's 41mm and I also see various sellers on eBay selling 41mm calipers for Skoda Octavia and in my year yet the built in eBay tells me these do not fit your car?

 

So there are opposing messages here.

Edited 15 December, 20205 yr by Aj77

There are three different rear disc set-ups for a 2008 mk2 Octavia, the last three diagrams on this page: https://skoda.7zap.com/en/cz/octavia/oct/2008-419/6/

If your car still has the build data sticker on the boot floor near the spare wheel well, you'll find one of the three PR codes starting 1K followed by a D, a P or an F. From what you've measured you'll most likely see 1KF, the 41mm piston variant with 260x12mm discs.

 

ECP lookup by reg is just rubbish in my experience.  Phoning them may give better results.

 

 

28 minutes ago, Wino said:

There are three different rear disc set-ups for a 2008 mk2 Octavia, the last three diagrams on this page: https://skoda.7zap.com/en/cz/octavia/oct/2008-419/6/

If your car still has the build data sticker on the boot floor near the spare wheel well, you'll find one of the three PR codes starting 1K followed by a D, a P or an F. From what you've measured you'll most likely see 1KF, the 41mm piston variant with 260x12mm discs.

 

ECP lookup by reg is just rubbish in my experience.  Phoning them may give better results.

 

 

Yep it's 1KF.

 

Thanks.

Next question is, is the short metal brake line from the caliper to the hose universal, as the only ones I can find are around £20.

 

Are these standard fittings and construction between all cars?

14 minutes ago, Aj77 said:

Next question is, is the short metal brake line from the caliper to the hose universal, as the only ones I can find are around £20.

 

Are these standard fittings and construction between all cars?

 

I would very much doubt that, every car marque and model version CAN be different depending on the design detail in the area of that calliper. I've always saved myself pain and time wasting by buying the correct part.

On that link I gave you before, about halfway down the page of diagrams there are two for rear brake hose set-ups depending on whether 4x4 or not. Pick the right page out of those two, find part number for relevant hose. Hint: if you can't see part numbers try viewing on a computer rather than phone, phones seem to sometimes not display all the columns in the tables.

 

Unless you have the gear to make up a brake line I suggest taking the old part to a garage, they can make up a simple U shaped replacement in 5 minutes for cheap.

16 hours ago, Wino said:

There are three different rear disc set-ups for a 2008 mk2 Octavia, the last three diagrams on this page: https://skoda.7zap.com/en/cz/octavia/oct/2008-419/6/

If your car still has the build data sticker on the boot floor near the spare wheel well, you'll find one of the three PR codes starting 1K followed by a D, a P or an F. From what you've measured you'll most likely see 1KF, the 41mm piston variant with 260x12mm discs.

 

ECP lookup by reg is just rubbish in my experience.  Phoning them may give better results.

 

Any chance of finding the part number, I've looked several times but I'm not 100% sure I'm getting the right part?

For the calipers?

1K0 615 423M left

1K0 615 424M right.

The part numbers ending C were superseded by the ones ending H, which were again superseded by the ones above, on 23/01/2008.

 

Edited 16 December, 20205 yr by Wino

41 minutes ago, Wino said:

For the calipers?

1K0 615 423M left

1K0 615 424M right.

The part numbers ending C were superseded by the ones ending H, which were again superseded by the ones above, on 23/01/2008.

 

Thanks.

1 hour ago, Wino said:

For the calipers?

1K0 615 423M left

1K0 615 424M right.

The part numbers ending C were superseded by the ones ending H, which were again superseded by the ones above, on 23/01/2008.

 

Do you think you could find me a rear right side caliper brake pipe, the short metal one with plastic coat that goes from caliper to brake hose union. I've looked and looked, Skoda is wanting £30!. I can't be sure I've found the right pipe. You seem quite clued up on this.

 

Don't bother if you don't want to do it but I'd appreciate it if you did, I'm looking for as cheap as possible ideally £15 or less.

Is this what you are after

 

https://www.ebay.co.uk/itm/123921054659

2 hours ago, wiilydog said:

Is this what you are after

 

https://www.ebay.co.uk/itm/123921054659

 

How do you know that fits as doesn't list Skoda Octavia 2008?

Why do you need to change the brake pipes?

3 hours ago, Tech1e said:

Why do you need to change the brake pipes?

 

I took caliper off and fitted a new o seal unfortunately I damaged the brake pipe in the process.

If you have TRW calipers the pipes will fit as golf Mk5  shares a lot it's components with the Skoda Octavia with it being part of the same VAG

Can anyone tell me if these rear brake pads are the right size. I bought them from eurocarparts before I really understood that searching by REG on ECP doesn't necessarily give me the right results for my car. For example it says I need 256mm brake discs when really I need 260mm or it says I have a 38mm caliper piston when actually it's a 41mm piston.

 

However maybe pads are more universal.

 

These are the pads(this is just for reference as the ones on ECP are now sold out)

 

https://www.halfords.com/motoring/car-parts/brakes/brake-pads-and-wear-sensors/eicher-rear-brake-pads-101441179-207830.html

 

Now from this site,

 

https://www.automm.be/recherche/jeu-de-4-plaquettes-de-frein-arriere-402/eicher-5940/101441179.html

 

It says these pads are 105.5mm, 56mm, 17mm and their code (PR code I assume) is 1K0 698 451D.

 

Now on this site(which I think is the correct info for my car)

 

https://skoda.7zap.com/en/cz/octavia/oct/2008-419/6/615-615065/

 

on list (10) for brake pads it gives 2 codes, 1K0 698 451 G and JZW 698 451 D which as you can see is not the say as 1K0 698 451D. It also lists the dimensions as 105.5mm, 55.9, 17.1mm.

 

so are the pads I bought the same as these, I thinking I've bought the wrong pads even though the dimensions are possibly just 1mm off from what I should have, but it's not 100% clear to me?

 

 

 

 

 

 

 

 

 

Edited 17 December, 20205 yr by Aj77

1K0698451D superseded to the suffix -G part number in late 2007 according to oemwolf, a handy site for looking up such things. So should be OK.

https://oemwolf.com/oem-parts/1k0698451d.html#replacements

 

 

So I finally managed to get a brake disc removed , the carrier bolt heads had to be cut off and the carrier smashed out, very arduous process. Now my next problem, I have a metal ruler and if I measure the diameter as best I can I make the diameter 258mm. Now as far as I can tell eurocarparts are recommending me 256mm discs but the data sheets are dealer say 260mm discs, maybe it's really 258mm?

 

Could the diameter have shrunk 2mm from corrosion on the edges?

 

This saga is going on and on.

Usually the diameter increases due to rust build up.

 

It is concerning reading your saga, especially due to the safety aspect of the area being worked on.

Could be that they've been replaced previously with 256/255mm ones.. Rust always expands the native metal so it might be?

 

What thickness are they if you file away all the rust from the lip? (Or measure on a bit the pads have kept clean if you have the means to)

 

255mm discs start at 10mm thick, the 260mm ones at 12mm thick.

 

Such a mess! On this page for the smallest discs, titled 255mm, item 7, the disc itself is described as 253 x 10! https://skoda.7zap.com/en/cz/octavia/oct/2008-419/6/615-615060/

Edited 17 December, 20205 yr by Wino

Any idea why the caliper carrier bolts are referenced as M12 bolts when they need and M14 spline socket?

 

From this page, https://skoda.7zap.com/en/cz/octavia/oct/2008-419/6/615-615065/

 

N 91006802 brings up 

https://www.onlinecarparts.co.uk/febi-bilstein-9799886.html

 

Which says, Outer thread [mm]:M12 x 1,5.

 

 

 

There are a few fasteners like that - with tool size sounding wrong relative to the thread size but actually being correct.  It doesn't surprise me to see such a mismatch.