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Thread: 3.0 CDTi V6 front discs

  1. #1
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    Default 3.0 CDTi V6 front discs

    Not had the car long, but having looked at the front discs I'd say they're knackered, big lip and getting out of shape. So the question is;

    1. do I simply replace them with new vx ones
    2. upgrade to a decent aftermarket grooved/vented set (I'd welcome suggestions on this)
    3. get a set of VXR discs and carriers, do the bit of machining that's required.

    3 might be kind of out just now as I still need to upgrade to 18s or 19s, just not seen the right set at the right price yet.

    Any advice would be appreciated.

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    Regular Member m8internet's Avatar
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    What mileage is the car on?
    How long have the discs been on the car?
    Who supplied and fitted them?
    What brand are those discs?
    How many sets of pads have those discs had on them?
    What is the braking efficiency like?
    How much pad material is left?
    How do the rears compare to the front?

    I find the front discs will last to three sets of pads
    Typically 25K miles for pads and 75K miles for discs
    However, the third sets of pads do cause some unusual rings on the inner edge of the disc, which eventually disappears as both surfaces wear
    I am now on my second such set and has exhibited this same issue again

    Don't bother with uprated / grooved discs, they are already vented (as are the rear), and stick with VX OE pads and discs (the kit is just as cheap as the pads or discs separate)
    When new they are extremely efficient and can stop you on a sixpence, and the same applies to the rears
    The only difference with the rears is they will only last to two sets of pads when original, but the replacements will easily last longer
    Typically 40K on the original set, then 20K miles for pads and 60K miles for discs
    Last edited by m8internet; 30th July 2011 at 09:28.

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    Cheers m8internet

    There's just over 80k on the clock, and as the cars new to me I couldn't tell you how long the discs have been on, or how many pads it's been through. The rears have been replaced fairly recently (bills to support it and they're still new looking).

    The front pads still have lots of life left, but they ain't flat anymore due to the bad scoring and deformation on the discs.

    The discs definately need replacing, it's just what with.

    I have no issues with how good the brakes are, but if spending a little more on 'upgraded' discs made an improvement over norm, then it may be worth it? But if anyones done this and found next to no improvement then there's little point.

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    Regular Member m8internet's Avatar
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    The front discs are probably the originals at that mileage and probably had one if not two sets of pads

    Looking at my service history and the front discs (and pads) on mine were replaced at 74488 miles
    Front pads went on at 30297 and 56436
    On this second set of discs the pads went at 101776 and 121554
    Coming up on another set of discs soon

    Wear them out completely and replace both
    Front pad and disc set : 93186299
    Costs about £85 (the pads alone cost £65) from VX dealership
    Fitting is just over 1 hour, my local garage charged £20 first time round but advised they would have to charge more next time as they didn't realise how long it took
    If the front brake pad sensor has worn through it will also need replaced, worth buying one and if not required keeping for future use

    Upgrading, the 314mm are perfect for this car, no need to upgrade
    Last edited by m8internet; 30th July 2011 at 12:26.

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    Regular Member Celes's Avatar
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    Cheers guys, next time I'm passing the vx dealers i'll pop in and get a set.

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    Regular Member m8internet's Avatar
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    Just as an aside
    Have you had the front brakes examined, and the discs and pads material measured?
    I would be concerned if there is deformation, to try and ascertain the source
    However, the lip would be normal if the discs are near the end of their life, especially if they have already had two sets of pads on them

    Normally the issue with brakes is on the rear, already well documented and I have experienced this on all Vectra B and Vectra C, as well as my own

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    They seem ok to be honest, I stripped them down when I painted the calipers and carrier. The slidders were in good nick and moved freely with no lateral play and I also check round the edge of the piston boot, again all looked ok with no pitting etc.

    Next time I've got her up on the four poster fitting the discs and pads I'll give her another strip down, if there has been anything happening hopefully I may notice this time as I know what it looked like before.

    The brakes do work well, no pulling in either direction, no squeeling or grinding noises so hopefully all will be well once the new discs/pads are on. It's also one side more than the other.

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    Regular Member m8internet's Avatar
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    Most brakes will look horrific but the only way to tell is take actual measurements
    I would therefore suggest always having this done, especially when replacing the pads

    How much front brake pad material is there?
    If there is loads left (almost new) then this may be the cause as I too have had this twice now and the solution is to simply let both surfaces wear naturally

    I do agree though, play it safe in any doubt given how cheap a complete set of pads and discs is
    The new pads will last 30K miles and the discs to at least twice that
    What I do find is the pads wear out much faster than any other car I have owned, but that is simply down to the vehicle weight and larger material than previous cars
    In the past I only got two sets of pads per discs, at the end of the second set I was always advised the discs would need replacing on the third set, so never bothered, but not had that so far on the 3.0 V6 CDTI

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