Omega Owners Forum - Choosing new Brake Discs

richardirv

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Choosing new Brake Discs
17. Jan 2011 at 09:08

My brakes dont feel as great as they once did, they aint that old but they were cheap discs, on my last service I was told that there was some corrosion on the back of the front discs.

When I put those discs on I said to myself, the next time I buy some I am gonna get some decent ones, maybe of the drilled/grooved variety.

Now I don't want to spend a fortune but I was looking at the ones on LMF, Black Diamond.

http://www.lmfvauxhall.co.uk/Brake-Discs-c-2692/

Does anyone have any thoughts or other suggestions? Are these any good? Thumbs Up!

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Jimbob Global Moderator Admin Team Offline Third nipple removal completed succesfuly Posts: 20462 Chester / Flintshire Gender: Drives: 52 3.2 MV6 Estate & 98 3.0 MV6 Manual Estate	Re: Choosing new Brake Discs Reply #1 - 17. Jan 2011 at 09:26 any reason you dont want Gen VX? at around £100 for disks and pads? ive heard 'cheap' drilled and grooved can be prone to breaking (as opposed to braking ) as too fragile
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Andy B

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Re: Choosing new Brake Discs
Reply #2 - 17. Jan 2011 at 09:27

richardirv wrote on 17. Jan 2011 at 09:08:

.....
When I put those discs on I said to myself, the next time I buy some I am gonna get some decent ones, maybe of the drilled/grooved variety.

Now I don't want to spend a fortune but I was looking at the ones on LMF, Black Diamond.

http://www.lmfvauxhall.co.uk/Brake-Discs-c-2692/

Does anyone have any thoughts or other suggestions? Are these any good? Thumbs Up!

Grooved/drilled discs are for the race track where they have a very hard life & are changed probably each race.
Vauxhall discs & pads are around £100 a set using your Trade Club card.

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Kevin Wood

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Re: Choosing new Brake Discs
Reply #3 - 17. Jan 2011 at 09:34

The general consensus is that drilled / grooved disks aren't worth bothering with on a road car. They won't affect the braking effect and are only really useful for clearing pad material and gases when the pads are being given a serious hammering.

Corrosion on the rear of the disk happens, IME, when there is an incomplete contact area between the pad and the disk due to the pad material breaking down. I'm not sure why it's always the inside of the disk that suffers but that seems to be the case.

Perhaps the inside of the disk tends to rust more when the vehicle is parked up due to the backplate holding moisture against the disk, and a bit of rusting around the perimeter of the disk then takes out pad material so that part of the disk isn't cleared by friction.

I would say trade club disks are fine, to be honest.

Kevin

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TheBoy

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Re: Choosing new Brake Discs
Reply #4 - 17. Jan 2011 at 09:37

Kevin Wood wrote on 17. Jan 2011 at 09:34:

The general consensus is that drilled / grooved disks aren't worth bothering with on a road car. They won't affect the braking effect and are only really useful for clearing pad material and gases when the pads are being given a serious hammering.

Corrosion on the rear of the disk happens, IME, when there is an incomplete contact area between the pad and the disk due to the pad material breaking down. I'm not sure why it's always the inside of the disk that suffers but that seems to be the case.

Perhaps the inside of the disk tends to rust more when the vehicle is parked up due to the backplate holding moisture against the disk, and a bit of rusting around the perimeter of the disk then takes out pad material so that part of the disk isn't cleared by friction.

I would say trade club disks are fine, to be honest.

Kevin

I reckon that starts to happen when the pads approach half worn. Wonder if its something to do with the forces from the caliper once the pads wear?

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TheBoy Administrator Offline TBE has an MOT! Posts: 64817 Brackley, Northants Gender: Drives: 98 MV6, 03 Elite, 00 25, 89 ZX10	Re: Choosing new Brake Discs Reply #5 - 17. Jan 2011 at 09:37 BTW, another vote for TC discs. (and pads, just to annoy chrisgixer )
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richardirv Omega Knight Offline Posts: 1329 Leeds, West Yorkshire Gender: Drives: 2002 2.6 MV6	Re: Choosing new Brake Discs Reply #6 - 17. Jan 2011 at 09:42 No real objection to VX, I do generally struggle with my breaks overheating, I just thought getting some combi discs would help cooling and improve braking performance and they tend to look better on the car.
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Kevin Wood

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Re: Choosing new Brake Discs
Reply #7 - 17. Jan 2011 at 09:42

TheBoy wrote on 17. Jan 2011 at 09:37:

I reckon that starts to happen when the pads approach half worn. Wonder if its something to do with the forces from the caliper once the pads wear?

Could be. I wonder if the caliper tends to bind on its' pins instead of floating properly giving an uneven application of force to the rear pad?

Kevin

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Mr Skrunts Over Active Poster Offline 3.O Elite Saloon with all the toys, Posts: 23830 Skruntie Land. Gender: Drives: Jimbob Mad It seems	Re: Choosing new Brake Discs Reply #8 - 17. Jan 2011 at 10:00 Ponder on this? Is you and your familys life worth a cheap set of Disks? Let's be right about it, it's got to be the most important safety factor on the car (Disks and brake pads)
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richardirv

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Re: Choosing new Brake Discs
Reply #9 - 17. Jan 2011 at 10:05

Yes I agree and normally wouldn't put cheap discs on it, the only reason it has is I had bought a new set of pads all round and when they were being fitted we realised my discs were in bad shape and it was silly to fit new pads to worn discs and so I visited the only shop that was open and got the only discs they had in stock, think they were £55 (fronts). It was just the way it went on the day.

Thats why I wanted to get some good ones this time and thought that the Black Diamond ones may be better than standard.

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Kevin Wood

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Re: Choosing new Brake Discs
Reply #10 - 17. Jan 2011 at 10:13

richardirv wrote on 17. Jan 2011 at 10:05:

Yes I agree and normally wouldn't put cheap discs on it, the only reason it has is I had bought a new set of pads all round and when they were being fitted we realised my discs were in bad shape and it was silly to fit new pads to worn discs and so I visited the only shop that was open and got the only discs they had in stock, think they were £55 (fronts). It was just the way it went on the day.

Thats why I wanted to get some good ones this time and thought that the Black Diamond ones may be better than standard.

Yep. Fair enough. I just personally think that drilled / grooved disks are the wrong way to go and you don't need to look any further than the trade club disks+pads set.

It'd be worth taking the pins out of the caliper and cleaning them up, checking for wear and then greasing before reassembly while you're at it.

kevin

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richardirv

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Re: Choosing new Brake Discs
Reply #11 - 17. Jan 2011 at 10:17

Kevin Wood wrote on 17. Jan 2011 at 10:13:

richardirv wrote on 17. Jan 2011 at 10:05:

Yes I agree and normally wouldn't put cheap discs on it, the only reason it has is I had bought a new set of pads all round and when they were being fitted we realised my discs were in bad shape and it was silly to fit new pads to worn discs and so I visited the only shop that was open and got the only discs they had in stock, think they were £55 (fronts). It was just the way it went on the day.

Thats why I wanted to get some good ones this time and thought that the Black Diamond ones may be better than standard.

Yep. Fair enough. I just personally think that drilled / grooved disks are the wrong way to go and you don't need to look any further than the trade club disks+pads set.

It'd be worth taking the pins out of the caliper and cleaning them up, checking for wear and then greasing before reassembly while you're at it.

kevin

Thanks, all advice taken on board, that why i posted.

Just hate it when I get brake fade after one big braking zone! Not good for the next! Quite scarey! LOL

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Kevin Wood

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Re: Choosing new Brake Discs
Reply #12 - 17. Jan 2011 at 10:38

richardirv wrote on 17. Jan 2011 at 10:17:

Just hate it when I get brake fade after one big braking zone! Not good for the next! Quite scarey! LOL

I don't find that to be much of a problem. Obviously it can be provoked but I tend to be reasonably light on the brakes, I suppose. How much energy they can dissipate comes down to the physical size of the brakes more than anything else, so it's not and easy thing to improve.

I did have a problem with the brakes fading quite easily but this went away when I serviced the rear brakes so I suspect (although not that badly worn) they were not that great and the fronts were taking more punishment as a result.

Kevin

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richardirv

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Re: Choosing new Brake Discs
Reply #13 - 17. Jan 2011 at 10:44

Yeah, I'm pretty sure VX ones will be much better than the ones I have at the moment but to be honest its something that I have always experienced even before these discs, and on other cars.

I don't tend to brake too late but its when braking from high speed to 0 or walking pace kills them and if I try to do that again within a minute or so, its quite scarey! I know not to do it with these brakes and tbh its not something I do on a regular basis but it would be nice to know I had sustained braking power without any fade when I need it. Thumbs Up!

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TheBoy

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Re: Choosing new Brake Discs
Reply #14 - 17. Jan 2011 at 12:18

richardirv wrote on 17. Jan 2011 at 10:44:

Yeah, I'm pretty sure VX ones will be much better than the ones I have at the moment but to be honest its something that I have always experienced even before these discs, and on other cars.

I don't tend to brake too late but its when braking from high speed to 0 or walking pace kills them and if I try to do that again within a minute or so, its quite scarey! I know not to do it with these brakes and tbh its not something I do on a regular basis but it would be nice to know I had sustained braking power without any fade when I need it. Thumbs Up!

I find that trade club discs and trade club pads can get my MV6 across Milton Keynes at an anxious pace. By the 8th or 9th roundabout, if I've had to stop at every one, they are just starting to go off big time. But thats probably not far off the equivilent of trackday abuse to be honest - possibly worse, as every 1/4 - 1/2m, you're having to come from flat out to a standstill.

If you feel you need more, then maybe a better pad - EBC RedStuff could work well for this, but remember they don't work when cold...

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