I think it could be a tried square socket 14mm otherwise known as a spline bit M14.

 

2008 Octavia FSI, 1.6 petrol.

 

 

Is this the same or similar socket to the security nut lug on the wheels?

Nobody?

An M14 triple-square socket is definitely not the same as, nor similar to a locking wheel bolt tool.

Ask google for a picture.

2 hours ago, Wino said:

An M14 triple-square socket is definitely not the same as, nor similar to a locking wheel bolt tool.

Ask google for a picture.

 

Yeah it's not. Do you know if this is the correct socket bit to remove the two big bolts holding in the caliper carrier?

 

M14 spline bit is the correct size for removing these  carrier bolts

 

https://www.ebay.co.uk/itm/US-PRO-1-2-DR-Spline-Bit-Socket-M14-X-55MM-3399/143043245459?epid=4026859259&hash=item214e0ab593:g:z3oAAOSwK1RcCow9

Edited 12 December, 20205 yr by wiilydog

1 hour ago, wiilydog said:

M14 spline bit is the correct size for removing these  carrier bolts

 

https://www.ebay.co.uk/itm/US-PRO-1-2-DR-Spline-Bit-Socket-M14-X-55MM-3399/143043245459?epid=4026859259&hash=item214e0ab593:g:z3oAAOSwK1RcCow9

 

Excellent that's what i bought, the sockets are pretty rusted though and I hope I can get these to seat properly.

A bit of a late reply but heres what I did. Jack the veh up as high as you can get it safely and using axle stands, put the wheels under the car forextra protection. The veh needs to be high enough to allow the use of a 24" breaker bar together with a long helper tube, then brute force will do it. Oh, I had sprayed the bolts wherever I could with penetrating fluid, each day for a week beforehand. I know the spray treatment worked because I couldn't budge them beforehand.

12 hours ago, TonyOB said:

A bit of a late reply but heres what I did. Jack the veh up as high as you can get it safely and using axle stands, put the wheels under the car forextra protection. The veh needs to be high enough to allow the use of a 24" breaker bar together with a long helper tube, then brute force will do it. Oh, I had sprayed the bolts wherever I could with penetrating fluid, each day for a week beforehand. I know the spray treatment worked because I couldn't budge them beforehand.

 

The heads of the bolts had to be cut off then you can just hammer the carrier off as it's only theaded on one end. 

I tried to remove the bolts dry but they were too tight, I got several different length socket tool and sprayed daily. I have a trolley jack so could the car really hight. In total, I had about 3 feet extension and the bolts gave in. I'm 74 years old and was determined to beat this task, not easy but you have to make sure the socket is well home and never kinked at an angle

8 hours ago, TonyOB said:

I tried to remove the bolts dry but they were too tight, I got several different length socket tool and sprayed daily. I have a trolley jack so could the car really hight. In total, I had about 3 feet extension and the bolts gave in. I'm 74 years old and was determined to beat this task, not easy but you have to make sure the socket is well home and never kinked at an angle

 

It's almost easier to cut the heads off the bolts with a Dremel, you'll go through a few blades but you should really be replacing the bolts anyway so it's no loss on bolts and it's easy to do, takes about 10-15mins to cut a head off.

On 11/01/2021 at 08:15, Aj77 said:

 

It's almost easier to cut the heads off the bolts with a Dremel, you'll go through a few blades but you should really be replacing the bolts anyway so it's no loss on bolts and it's easy to do, takes about 10-15mins to cut a head off.

Hi Aj77, I had done much research on-line and found that most mechanics report that they always reuse these bolts. If you have access to an air tool, these carrier bolts do come out easilly. I'm pleased that I managed it with limited facilities and I did clean the threads and reused the bolts with a little blue Loctite on the threads and tightened them using a torque wrench. This was a simple but prolonged job which took me a week of daily spraying K2 Vulcan penetrating oil, My biggest worry was if the splines stripped, what do I do then, so I will keep your method in mind for when I do my own Octavia in the summer. 

1 hour ago, TonyOB said:

Hi Aj77, I had done much research on-line and found that most mechanics report that they always reuse these bolts. If you have access to an air tool, these carrier bolts do come out easilly. I'm pleased that I managed it with limited facilities and I did clean the threads and reused the bolts with a little blue Loctite on the threads and tightened them using a torque wrench. This was a simple but prolonged job which took me a week of daily spraying K2 Vulcan penetrating oil, My biggest worry was if the splines stripped, what do I do then, so I will keep your method in mind for when I do my own Octavia in the summer. 

 

Why not just buy new bolts they cost about £10 for the pair, by the time a week had past they would have arrived?

2 hours ago, Aj77 said:

 

Why not just buy new bolts they cost about £10 for the pair, by the time a week had past they would have arrived?

A misunderstanding has occured - The penetrating fluid, applyed daily for a week,  was necessary in order to make the bolts easier to undo. The timescale was unimportant as we had leant my wifes Fabio to our daughter.  These carrier bolts are well known to be difficult to remove without air tools. Reason for Brake overhaul - Daughter's 2007 Octavia was noted as "All brake discs worn to minimum thiskness", front brake pads were well worn but rear brake pads were still nearly new.  but rear discs were at a minimum thickness. At 93000 miles, I had a feeling that these were original rear discs and that previously, only the pads had been replaced. I decided to replace discs and pads all round and overhaul the calipers at the same time, yes, things you do for your daughters. It wasn't a weekend job so we provided our daughter with another car. I found the whole job interesting with several challenges. I'm only hoping my experience may help someone else carrying out these tasks for the first time, as I was.