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RDA dimpled and slotted rotors opinions please

Discussion in 'VR - VS Holden Commodore (1993 - 1997)' started by losh1971, Sep 5, 2018.

  1. losh1971

    losh1971 Well-Known Member

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  2. losh1971

    losh1971 Well-Known Member

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    I'll add I can get them for $78 for the pair as I have $50 voucher plus they are on special.
     
  3. losh1971

    losh1971 Well-Known Member

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    So I Googled them and had mixed reviews. I found only one link to using them on a Commodore. Most of the reviews I found said that DBA's are far better. But I checked the JC forum and found that most DBA's are Chinese as are most RDA's but RDA's have stricter quality controls than DBA's. The JC thread suggested RDA are actually a better rotor based on the level of rotor chosen.
    Thinking the RDA Chinese slotted's will be a good choice as far a bang for buck and probably better than the equivalent in DBA Chinese slotted's. Also RDA's seem to be widely used in the trade. I have used standard RDA's in the past and have found them ok. The premium range in RDA slotted and DBA slotted are double the price and too exi for me, especially considering I was originally go to grab a pair of RDA standard rotors from Car Parts Plus for $80 the pair. Basically I'd be jumping one level in there range and paying $4 less.
    I currently have Bosch as they were cheap and served their purpose, which was to make my brakes better than they were but within a budget. The Bosch are not hard enough and will have a lip by the time my QFM's wear out but they will make OK spares to chuck in the shed with the old QFM's as long as I get them swapped for new while I still have some meat on them.
     
  4. lowandslow

    lowandslow Well-Known Member

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    Always used DBA's and never had a problem with wear or vibration.
     
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  5. losh1971

    losh1971 Well-Known Member

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    Ended up buying a pair of RDA's, the ones I linked. I suspect that will be fine and will be a definite upgrade from my Bosch rotors, which weren't really that bad, apart from the lip starting to form. The RDA's are hardened steel so I think that will be better.
    Guess my only concern is them being slotted and dimpled I may not be able to get them machined, which I always do each pad change unless I replace the rotors.
     
  6. losh1971

    losh1971 Well-Known Member

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    I have a new set of RDA Street's in the shed to fit on the rear, once I upgrade the rear with braided hoses, rebuilt calipers and QFM pads. Still collecting parts to upgrade the back brakes, so reckon it will be early next year before I get it all sorted.
     
  7. stick3

    stick3 Active Member

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    i have them on both cars and the pads are rda extreme as you know losh the ute has got the rda big brake kit , i can t fault them the braking is smooth and no noise only replace the pads about 6 weeks ago on both cars
    the vz had dba s on the front which warped so i gave the rda s a try, there been on about 5- 6 years now
    mate its upto you, they are all made in china and i try not to hit them with cold water when there hot
     
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  8. rossimo

    rossimo Member

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    I've had several sets of rda slotteds on my subarus over the years, never had an issue with them on the street or track. Never ran dimpled though.

    Recently went to the dba 5000 2 piece t3 slotted front rotors and 4000 solid t3 slotted rear rotors. The dbas were made in aus.

    I've heard alot of bad reviews on the rda gear on the internets but never had an issue with them.
     
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  9. losh1971

    losh1971 Well-Known Member

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    From what I have researched the top of the line RDA's and DBA's are both made in Aust. Where as the lower range are made in China. I read on a Ford forum people bagging RDA's but Ford's were notorious for having rotor problems including warping so I really didn't take the info as gospel.
     
  10. losh1971

    losh1971 Well-Known Member

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    Yeah the VT upgrade would be nice on my old bus but I have to draw the line somewhere lol. If I don't I'd be better off buying a late model with a V8.
     
  11. vc commodore

    vc commodore Well-Known Member

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    Commodores and Fords of the same era have warping rotor problem..

    Brand of rotors....Some will bag one brand, yet others will praise them till the cows come home.

    Personally I prefer DBA's....

    Doesn't matter if they are slotted or dimpled....They can be machined, providing they are above minimum thickness.

    Finally...Can you post things in one post instead of 6 different posts, with the branch off....Example...The beginning of the thread, you posted 3 times, before anyone replied...I know you want people to be informed on what you have found/ done etc, etc, but it does make it exteemely difficult to read
     
  12. losh1971

    losh1971 Well-Known Member

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    Will keep that in mind. Edit: Good to know they can be machined I saw a rotor a number of years ago where Pitstop in Victor stuffed it as their machine didn't take well to holes in the rotor.
     
    Last edited: Sep 5, 2018
  13. vc commodore

    vc commodore Well-Known Member

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    Must have been a crap machine......I've lost count of the number of rotors I've machines, that are drilled....The last was only a couple of months ago, when I machined my old crossed drilled and slotted rotors, in preparation to go on my VH Commodore
     
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  14. lmoengnr

    lmoengnr Well-Known Member

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    The only problem machining cross drilled/slotted/dimpled rotors is the cutting tool...
    Carbide tooling cant handle 'interrupted cuts', just need to change to a HSS cutting tool.
     
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  15. markovr

    markovr Well-Known Member

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    I have the curved slots with dimples RDA discs on 2 of my cars and with qfm hpx pads they stop well but after a few years now they both have an unevenness that feels like there are low and high spots...the discs dont get warped from heat ...they just get an uneven amount of material deposited on them that when it is applied against the pads when braking give a varying amount of grip especially at low speeds...no doubt a skim would clean it up but im guessing the burn in process to discs when new is very important to their continued smooth operation
     
  16. Pollushon

    Pollushon Boost gives me a bar....

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    Depends on how you drive. I've cooked pretty much anything less than DBA HD series. RDA probably held up the best of the budget kit.
     
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