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Old 06-14-2004, 10:46 PM   #1
KanosWRX
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Default DBA 4000 Problem/Defects, Owners look here

This might relate to other DBA front rotors for the WRX besides just the 4000 series.

The problem is with the rotors scraping the inside tabs on the clips that hold the pads at the top and bottom of the caliper bracket. As well as the rotors scraping the actual caliper bracket. I wish I had taken pictures of this when I had mine off but I will describe it the best I can. The way I found the problem was when turning I would get an awefull grinding noise, I thought at first it was just noisey pads so I bought a different brand pad but the problem was still there. I then noticed a groove starting to form on the rotor. I looked at this horible groove in relation to the caliper and bracket and found the cause of the problem as I described above.

I then proceded to put my OEM rotors on and I had no more issues with scraping or noise. Oddly enough I met another WRX owner who had some DBA rotors and I noticed the exact same problem on his rotors, a groove maybe 3-5mm wide near the outside portion of the rotor, maybe about 8-10 mm from the outside edge of the rotor.

I wanted to post this because I wanted to see if their were other people that had this issue, if it happened to two people so close its bound to have happened to others. Also his rotors are about 1 year old now, mine were brand new, so its not just a certain batch of bad rotors I don't think.

Also I know DBA stops by these fourms oftern, maybe they can clue us into whats going on and any possible fixes. I don't want to see my 260 dollars wasted, and I really loved the performance of these rotors.
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Old 06-15-2004, 11:10 AM   #2
KanosWRX
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bump
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Old 06-15-2004, 11:19 AM   #3
bemani
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What's the part #? 4??? Maybe you're using the wrong rotor.
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Old 06-15-2004, 11:44 AM   #4
KanosWRX
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I am 99% sure they were the DBA 4000's, the 295x25 mm rotors.
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Old 06-16-2004, 01:07 PM   #5
bemani
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The dba catalog says 4000 is for 4pots.

http://www.dba.com.au/catalogue/pdf/...000_online.pdf

Is that what you have?
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Old 06-16-2004, 02:29 PM   #6
KanosWRX
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Nope, don't have 4 pots, but from what everyone else has said you don't need the 4 pots to use the DBA 4000's.

Just wanted to also add I contacted DBA and someone from DBA has been working with me to help troubleshoot this problem. The more we have gotten into it, the more it looks like a Wheel Bearing issue, but we aren't 100% sure yet. Still I think I should make an appointment with Subaru so they can replace them under warranty if they are busted (I only have 23k miles).
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Old 06-16-2004, 04:35 PM   #7
Uncle Scotty
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The 650 is a USDM front application.

I have had the dba 4000's on my car, with the 4-pots, for 15k miles and NO problems/grinding whatsoever.
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Old 06-16-2004, 05:56 PM   #8
driggity
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Quote:
Originally posted by Uncle Scotty
The 650 is a USDM front application.
Yes, but the 650 is also a completely different series of rotor than the 4000 and isn't designed to be as much of a high performance rotor.

Kanos, have you tried contacting DBA directly to see what they have to say?
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Old 06-16-2004, 06:12 PM   #9
KanosWRX
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Yes, I contacted DBA directly, we are talking about it through e-mails and they are just as interested in solving this problem as I am. Shows how good of a company they are even as they are half way around the world. They sent me a picture of a STI track car they had with busted wheel bearings. It had grooves in relatively the same places as mine. If you look at the DBA 4000 series rotors and look at the long slots and short slots the lines seem to form right around those. I am almost positive its not related to the slots, as I can see the actuall rub marks on my brake brackets and pad clips.

The only thing that puzzels me is that I don't get the wear with the stock rotors (although mine are fairly well worn down and probably .05mm less in width then brand new rotors. My contact at DBA said with the DBA 4000 rotors on USDM calipers their should be about 1.75mm of space on each side between the rotor and the brake bracket.

I will have to perform some more tests and possibly take my car to subaru to check the wheel bearings. I tried just pushing and pulling the top of my tire while on my lunch break and on the passenger side I didn't hear any noises or feel any looseness. But on the driver side I heard a slight squeak type noise when I pulled and pushed on it, and I thought I felt a little looseness to it. If that is indeed true it sounds like it would be a bearing issue. But I will try taking the wheel off and putting the lugs on up to the rotor and just try pushing and pulling the rotor to see if I can feel any play to prove if its the wheel bearings or not.

The other thing is, sometimes when I am coasting and then accelerate I will hear a click sound. And also when I am coasting then brake I will hear another similar click sound. Also maybe related when just driving at a normal speed I will hear a quite almost chirping sound, kind of high pitched, then as soon as I put on some brakes it goes away. I am thinking this is all related to the brakes in one way or another just need to pinpoint all the problems.
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