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16

Omega General Help / Re: Rear brake back plate

« on: 03 October 2021, 14:59:42 »

There are three slightly different designs of backplate.
Assuming the backplates you found are equivalent to the most recent design then you'll also need the below seals for each side.
GM 24428129 = GASKET,PLATE,ASSY.,REAR BRAKE CARRIER
GM 24445691 = BOOT,LEVER,BRAKE CABLE (RUBBER)
and
GM 93174289 fitting kit or equivalent for each side.

This kit has the pins that fit from the inboard side of the backplate and are retained with domed washers with a keyslot on the outboard side.

To insert the brake-shoe pins from the inboard side you'll have to loosen the XZN splined bolts and temporarily move the plate outwards.

Thanks for the reply. Do you know if the three types you mention are interchangeable? The plate costs £90 to buy with shipping costs so I'm reluctant to take a punt on it unless I know that any of these types will work ok.

You say that I'll need a new fitting kit but will I not be able to reuse my existing pin and its spring which are still in good condition? I'm assuming the pins are all the same length and that this doesn't vary with the different plate designs? Also, I'm probably being dim and missing something here but I don't understand the last part of what you said about needing to loosen the bolts to move the plates outwards. Surely the pin fits through the keyhole on the plate from the drum side and this can be done after the plate is anchored in place? This job sounds like its going to be a real joy!

17

Omega General Help / Re: Rear brake back plate

« on: 03 October 2021, 12:48:23 »

You need to remove the hub to fit the backing plate without cutting it. That will also require a new wheel bearing.


Having replaced several bearings, I would cut the backing plate where the caliper fits and weld it back together once I had bolted both pieces in place. That cuts out about 30minutes hard work and the £40 bearing.


Where is your plate rusty? If it's the outside edges, I wouldn't worry too much; the only bit that matters is the mounting area for the handbrake shoes.

Thanks for the reply. I had the bearing replaced a few years but not many miles ago so definitely don't want to disturb that - its a shame the back plate problem wasn't noticed at the time as it might have been savable then. Cutting and welding seems like the best option. It is the inner part of the plate that is the problem as there is a big hole where the keyslot for the pin is and the surrounding metal is very weak. I have made up a plate that wedges against the trailing arm on one side and fits over a large part of the still strong outer part of the plate on the other side as a temporary repair. This is working ok for now and the handbrake shoes are held in place well enough though the already small gap between the head of the pin and the inside of the brake drum has reduced slightly. I could probably improve on this if necessary now I've done it once.

18

Omega General Help / Rear brake back plate

« on: 02 October 2021, 18:23:04 »

Hi All,
I need to replace the OS rear brake back plate on my 1996 Omega estate and would be grateful for some info.

Firstly, does anyone know where I can get hold of a plate? The only one I've been able to find is this pattern part on eBay - right rear brake backing plate *NEW* for Vauxhall Omega anchor plate back cover | eBay, eBay item number:114637224698, from a seller in Germany, but I was wondering if these can be sourced in the UK? Has anyone used this German supplier?

Secondly, could anyone confirm that only one brake plate design was used for all Omega B models? The eBay ad implies that this plate fits all models but I seem to remember reading somewhere that there were two designs or maybe two different handbrake shoe arrangements that could be used depending on whether the car is an early or late model? My handbrake shoes are held in place with springs and twist pins so the plate pictured looks correct.

Lastly, what's the best way to fit these plates? I've heard that some people have cut the plates in half then welded them back together in situ to avoid the grief of having to remove the wheel hub, etc, but is this a good option or a botch? The corrosion hole on my plate is too bad to cover with something small like a washer but I've made up a temporary bit of plate to cover the area that is working for now.

Many thanks for any replies,
Graham

19

Omega General Help / Re: Pas pipe advice needed

« on: 22 June 2019, 10:15:18 »

Thanks, I think you're right.

20

Omega General Help / Re: Pas pipe advice needed

« on: 22 June 2019, 08:48:53 »

Thanks for the info.

21

Omega General Help / Re: Pas pipe advice needed

« on: 28 May 2019, 10:32:01 »

It would be a big help if someone could confirm where the lower of the two pipes finishes up on the passenger side of the vehicle please. I initially thought it ends up screwed into the pas pump itself, but now I'm not so sure and its a bugger to trace its course.

Also, does anyone have a part number for the lower pipe? If I attempt a repair and that fails I'd like to know where I can get the part if I can't get one through here.

Thanks again,
Graham

22

Omega General Help / Re: Pas pipe advice needed

« on: 26 May 2019, 14:10:33 »

I may have misread this, but it seems BG offered you one in the second post.

I've messaged him and he's going to get back to me in a week or two.

23

Omega General Help / Re: Pas pipe advice needed

« on: 26 May 2019, 14:09:19 »

I had the very same problem a few months back and chose option 4 albeit with 2 clamps at each end and have had no problems since, there is no cooler rad for the pas system as it relies on the pipe loop in that gap in the bumper for it's cooling effect.

Thanks for this reply. I'm probably going to have a go at repairing as there's not a lot to lose, but what to know where I can get hold of a pipe if it doesn't work.

24

Omega General Help / Re: Pas pipe advice needed

« on: 24 May 2019, 10:45:14 »

a correctly sized Jubilee clip will work on any pressurised system you'll find on these cars. PAS isn't particularly high pressure.

I measured the pressure on the LC a few weeks back. At the output from the pump it's 95-100 bar, or 1500psi ish, on full lock. So I wouldn't want anything other than a faultless pipe between the pump and the steering box because a leak in a 100 bar pipe is going to spray fluid a long way and make a hell of a mess.

The other pipes, including the ones from the box back to the reservoir via the radiator carry much less pressure and are eminently bodge-able. Just be aware that the fluid does get quite hot (hence the need for a rad.

I feared that this might be the case.

25

Omega General Help / Re: Pas pipe advice needed

« on: 24 May 2019, 09:28:01 »

Option 4. It's ugly, but that's the only 'problem' with it.
Easy,  cheap and you could have it done before lunch. 

Thanks, so its not under high pressure then and jubilee clips should seal it?

Thanks for that - I had visions of replacing one leak with two new ones!
a correctly sized Jubilee clip will work on any pressurised system you'll find on these cars. PAS isn't particularly high pressure.

26

Omega General Help / Re: Pas pipe advice needed

« on: 23 May 2019, 19:26:16 »

Looking at it again I may not have traced the course of the leaking lower pipe correctly on the passenger side of the car - I thought it was going to the pas pump but maybe not, can anyone confirm please?

27

Omega General Help / Re: Pas pipe advice needed

« on: 23 May 2019, 19:22:26 »

Option 4. It's ugly, but that's the only 'problem' with it.
Easy,  cheap and you could have it done before lunch. 

Thanks, so its not under high pressure then and jubilee clips should seal it?

28

Omega General Help / Pas pipe advice needed

« on: 23 May 2019, 10:20:07 »

Hello everyone,
I have a leak from a badly rusted pas pipe of my 1996 V6 estate and would appreciate some information about the part. Its the lower of the two pipes visible in the gap in the front bumper wraparound. Its course is a bit difficult to trace but as far as I can see one end finishes at a jubilee clip more or less below the air filter box and the other end fits to the pas pump. I'd be grateful for answers to all or any of the questions below please.

1) have I traced the course of the pipe correctly and is it easy to remove?

2) does anyone have the part number for this pipe and can you tell me if it was common to all Omegas or just to the V6?

3) does anyone know where I can get one of these pipes either new or good secondhand?

4) if I get desperate could the pipe be repaired by cutting back to a good part of the steel pipe and adding a section of hose secured by jubilee clips, or will there be too much pressure in the system to get the clips to seal?

Thanks for all advice given. I was planning add some photos but can't find a way of doing so here without signing up to photobucket - is there a way to do this?.
Graham

29

Omega General Help / Re: Brake bleed screws

« on: 19 July 2018, 18:11:23 »

If anyone needs the front brake screws for the Lucas caliper I have found they are M8's, pitch is 1.25 (this is the coarser thread option), the total length is 41.5mm and the spanner size is 9mm.  I couldn't find many people selling the right length but Big Red Ltd sell them on their website and on eBay - their part number is BRB880010.

30

Omega General Help / Re: Brake imbalance

« on: 12 July 2018, 09:57:56 »

Thanks.