Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: nell77 on 07 June 2010, 19:52:10
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Which model had vented rear discs? I have a face lift elite on a Wreg 2000 and this has solid rears
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none of them did, vented discs are just for show :)
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But ive defo seen a 2.6 CD with vented rears thats what made me ask this question
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none of them did, ......
At least it's not just me that's wrong sometimes. ;)Some/all very late cars has vented at the back. Mick Dundee's are vented :y
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But ive defo seen a 2.6 CD with vented rears thats what made me ask this question
2.6 & 3.2 are late cars, but I can't be more specific :-/ :y
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2001 onwards from memory (may be 2001.5)
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Is there any advantage from this ?
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March 2001 - vented discs
All DBW V6s are AFAIK
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did'nt know they went vented :-[ - But is there any point? Can't see much need for them on a luxo barge :-/
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did'nt know they went vented :-[ - But is there any point? Can't see much need for them on a luxo barge :-/
Guess we learn something new every day
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if the factory didn't fit them then there is no need for them.. just for your mind :). i saw that the 5series have on estate version but on saloon they dodn't (2001 model)
i have 2,2dti 2002 and i don't have vented discs on back :)
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My MV6 has vented discs, but for the life of me, I can't think why!
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So can i assume my lowly 2.2 will have solids then .
I can go and whip the wheel of and check but its pouring down outside .
Im just about to buy some rear discs but now i better check first :y
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Im just about to buy some rear discs but now i better check first :y
What's up with those already fitted? My car's still on it's originals (certainly haven't been replaced in the last 70 000 miles) .............. 163 000 miles later. The rears don't do that much braking, I can't really see yours being worn enoughto have to replace them yet. :-/ :-/ :-/
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i have upgraded my rear discs to vented discs, and also the front to drilled and groved :).
vented and drilled + grooved are just to disperce heat more so you dont warp your disc :)
ANDY :y
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So can i assume my lowly 2.2 will have solids then .
I can go and whip the wheel of and check but its pouring down outside .
Im just about to buy some rear discs but now i better check first :y
Yep. With the rears genuine aren`t necessary, same as the pads & shoes
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i have upgraded my rear discs to vented discs, and also the front to drilled and groved :).
vented and drilled + grooved are just to disperce heat more so you dont warp your disc :)
ANDY :y
Upraded? You sure? Certainly by fitting vented at the back, you've now upset the front - rear bias of the original design, the master cylinders are apparently different. Drilled grooved discs have no advantage on the road over original fitment ..... but they look good. :y
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i have upgraded my rear discs to vented discs, and also the front to drilled and groved :).
vented and drilled + grooved are just to disperce heat more so you dont warp your disc :)
ANDY :y
Upraded? You sure? Certainly by fitting vented at the back, you've now upset the front - rear bias of the original design, the master cylinders are apparently different. Drilled grooved discs have no advantage on the road over original fitment ..... but they look good. :y
yes i am sure well i am a mechanic and everything has been done ;) i just like black diamond so thats whats on all my cars lol i have a rear disc conversion of black diamond on my fiesta too :)
but my miggy was damaged today :(
ANDY :y
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So can i assume my lowly 2.2 will have solids then .
I can go and whip the wheel of and check but its pouring down outside .
Im just about to buy some rear discs but now i better check first :y
Yep. With the rears genuine aren`t necessary, same as the pads & shoes
I have GM pads here anyway .
I'll get some ebay specials for the rear discs :y
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was just looking on ebay for some more stuff for my miggy when i came across this well it was first in the list
enjoy :) http://cgi.ebay.co.uk/Omega-VENTED-REAR-Drilled-Grooved-Brake-Discs-94-03-/110485744366?cmd=ViewItem&pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item19b976aaee
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I thought the vented rears used a different caliper :-?
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I thought the vented rears used a different caliper :-?
mah its all the same unless you are up grading the standard size of the disc :).
A :yNDY
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I thought the vented rears used a different caliper :-?
mah its all the same unless you are up grading the standard size of the disc :).
A :yNDY
Wont a vented disc be wider than a solid and hence need a different caliper ?
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I thought the vented rears used a different caliper :-?
mah its all the same unless you are up grading the standard size of the disc :).
A :yNDY
Wont a vented disc be wider than a solid and hence need a different caliper ?
no should all be the same size again unless upgradingbut if you are uprating discs to vented you would be getting the pads aswell so it always fits, because you wouldnt upgrade one without the other
ANDY :y
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I thought the vented rears used a different caliper :-?
mah its all the same unless you are up grading the standard size of the disc :).
A :yNDY
Wont a vented disc be wider than a solid and hence need a different caliper ?
no should all be the same size again unless upgradingbut if you are uprating discs to vented you would be getting the pads aswell so it always fits, because you wouldnt upgrade one without the other
ANDY :y
Ahh i didnt know that , learn something new every day :y
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I thought the vented rears used a different caliper :-?
mah its all the same unless you are up grading the standard size of the disc :).
A :yNDY
Wont a vented disc be wider than a solid and hence need a different caliper ?
Yes.
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Re: Any idea what type calliper I have?
Reply #7 - 07. Oct 2009 at 21:51 chrisgixer wrote on 06. Oct 2009 at 22:29:
Marks DTM Calibration wrote on 06. Oct 2009 at 13:50:
SteveD wrote on 06. Oct 2009 at 11:13:
Me being lazy here....
I'm lead to believe my V reg facelift 3.0 Elite Estate could have either Lucas or some other make(can't remember at the mo.) of calliper on the front.
Does anybody know for definite which type it will be or do I have to take a look? If the only way to tell is from looking, does anyone have a couple of pics so I can tell without removing a wheel?
Thanks
Steve
Only one type of caliper ever fitted to the front of the V6's
And rear calipers are wider if vented discs on the rear as well as the front??? Some body asked the other day and couldn remember for sure.
Cant help with the make sorry. Dont remember much in the way of markings either tbh
Fairly obvious but, vented discs are wider than solid ones and hence require a larger caliper
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I thought the vented rears used a different caliper :-?
mah its all the same unless you are up grading the standard size of the disc :).
A :yNDY
Wont a vented disc be wider than a solid and hence need a different caliper ?
no should all be the same size again unless upgradingbut if you are uprating discs to vented you would be getting the pads aswell so it always fits, because you wouldnt upgrade one without the other
ANDY :y
Ahh i didnt know that , learn something new every day :y
we all learn somthing :) like i learnt that i hate polish bikers
ANDY :y
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I thought the vented rears used a different caliper :-?
mah its all the same unless you are up grading the standard size of the disc :).
A :yNDY
Wont a vented disc be wider than a solid and hence need a different caliper ?
no should all be the same size again unless upgradingbut if you are uprating discs to vented you would be getting the pads aswell so it always fits, because you wouldnt upgrade one without the other
ANDY :y
I'm with Shrek. Vented discs will HAVE to have a wider caliper, or you'll have vented discs the overall thickness of solid discs .... 12/13mm?? :-/
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I thought the vented rears used a different caliper :-?
mah its all the same unless you are up grading the standard size of the disc :).
A :yNDY
Wont a vented disc be wider than a solid and hence need a different caliper ?
no should all be the same size again unless upgradingbut if you are uprating discs to vented you would be getting the pads aswell so it always fits, because you wouldnt upgrade one without the other
ANDY :y
I'm with Shrek. Vented discs will HAVE to have a wider caliper, or you'll have vented discs the overall thickness of solid discs .... 12/13mm?? :-/
Correct(http://www.easyfreesmileys.com/smileys/free-cool-smileys-268.gif) (http://www.easyfreesmileys.com/Free-Cool-Smileys/)
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Correct ....
I know ;) ;) ;)
IIRC they used to fit Princess vented discs to the front of Capris. The Princess calipers fouled so they used the old Capri calipers with a spacer fitted between the two halves.
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Don't think so,my 2003 Elite estate has them on as OE. And although super progresive brakes their just a load of trouble as regards spares. The calipers are now a non serviced part. I waited 3 weeks for some new replacements from Germany, only in the end to be told the GM policy was to provide Re-manufactured Units,exchanged for the old units on a surcharge system. These came as de-rusted, with a lot of vital casting relief that supports the pads rotted away, then passivated they even used the original pistons that were so rusty you could hardly define the cut outs that have to be off set 20deg. The reason I wanted to replace mine was they were also badly corroded so someone else will finish up with my scrapped caliper.The outcome after a lot of searching was I managed to source a new one, which was obviously old UK stock for the passenger side.The drivers side is a remanufactured unit. I travelled to a firm at Rochdale called Brakes International to see over the counter before I accepted the unit on offer he told me it was remanufactured in Denmark by a firm called Budweg. The standard was acceptable the casting showed minor rust damage but was well plated and both pistons were brand new replacements. The unit cost £129.25,I didn't return my old unit for a £20.00 + vat refund not really viable mileage wise. It's badly corroded anyway. So there it is all you with late model Elite's take note. I think its a scandal and irresponsible that things as vital as brake calipers cannot be purchased at any price new to OE spec. >:(In future I'll make it a part of my regular serviceing to hose off with water inside the calipers when the council start to grit the roads its obvious the vented disks are creating a turbine effect with the anti freezing chemicals and destroying the internals of the caliper castings.Sorry to have to impart such news but if you know these things then at least you can take precautions. :y :y
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I travelled to a firm at Rochdale called Brakes International to ......
Which is where my pattern discs came from for the front of my Senator. They lasted about 3/4000 miles before I had problems with warping. Needless to say that Brakes International were not interested. >:(
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I would never use aftermarket parts unless forced in this case I was forced. And they had the best option available by far.
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I thought the vented rears used a different caliper :-?
mah its all the same unless you are up grading the standard size of the disc :).
A :yNDY
They do, its wider. I replaced the solid discs on my old mini facelift to vented and had to get the calipers aswell ::)
Old disc/caliper
(http://i61.photobucket.com/albums/h64/pickledpepper/DSCF0095.jpg)
Vented disc/caliper
(http://i61.photobucket.com/albums/h64/pickledpepper/DSCF0096.jpg)
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there's a few things here....
the vented rear set-up is the same diameter, but thicker discs. The caliper is of course different because the disc-spacing aperture is wider, BUT the caliper pistons are also 42mm as opposed to 40 of the early cars.
I'm reasonably sure that the very late cars had what's called EBD, or "electeronic brake distribution", which is probably the reason for the larger piston - this mod alone increases the rear bias by some considerable amount, but is needed for EBD.
As far as I know, there are three basic different brake setups on the faster Omega B vehicles :-
( figures are disc dia/piston dia and primary/secondary master cylinder bore )
296/57 vented front, 286/40 solid rear with 25/20 master cylinder.
296/57 vented front, 286/40 solid rear with 25/25 master cylinder
296/57 vented front, 286/42 vented rear with 25/25 master cylinder and EBD
regarding "upgrades", I wouldn't advise unless you really know what you're doing. And by that I mean at least 10 years in a vehicle design capacity, with testing thrown in to boot. Brake bias is a very complex subject - even the confirmatory test costs upwards of £20K and takes a week to do. If you can't display absolute mastery of the subject, how good are you going to be in court when the judge asks you how come you've just mown down a bus-queue full of nuns ?
Of the things that could be changed, by far the most effective is the disc diameter and the piston diameter - larger diameter of both = more effective brakes, or to put it more correctly, more tractive effort for a given pedal force input.
Fitting the vented setup to a car with no other changes will raise the efficiency of the rear brakes, but will also result in them locking earlier - hence bringing the ABS on earlier and also unfortunately lengthening the overall stopping distance - what is needed is a balanced approach, where rear improvements are matched by front improvements.
As an example, I do actually have the late Omega B discs on the back of one of my cars, but it's got 350mm discs on the front, which makes the balance about right.
just for reference ( as I've said before ) grooved and vented is only of benefit when your pad life is at most two hours or less - think endurance racing. This is because the holes and grooves are there to dissipate gases and bits of dead pad - they perform no other tasks. They may even lead to premature wear and disc cracking.