should i change pads as well

[bulldog79]

gday every one i have changed my pads and rotors a bout 5,000 kms ago over the last few weeks i have been getting a real bad shake from side to side in the steering wheel when i brake i am sure my new frount rotors are warped i have taken the wheel off and when i spin the rotor you can hear the pads grab then let go would that be a sighn they are warped and i would like to know should i get the rotors machined or should i replace them and also sould i replace the pads or will they still be ok thanks

[John_ls1]

what brand of rotors and pads did you buy? they should last alot longer than 5000kms. have you done any high speed hard braking to warp them so quick?

you shouldn't need to change the pads, just get the discs machined if they are not that old.

[bulldog79]

i changed them when i was in canberra and i drove home the next day to sydney cariying 2 motor bikes in a trailer dont know if that would have hurt them they dba brand

[wortus]

When you fitted the new rotors did you use a wire wheel in a drill to remove all the rust scale etc off the hubs? The mating surfaces have to be clean with no rust or rust scale so the rotor will spin true. If you dodn't clean the hub face properly then you will need to do that and machine the discs.
When I change these I run the wire wheel over the hub until it is brught shiny metal, no rust as all.

[GenReaper]

Yep i bet your hubs were not cleaned propperly and thats causing the shuuder.
With brakes you need to do it propperly or get a mechanic to do it for you.

[bulldog79]

they were cleaned and they were painted i have changed them on other cars before with no trouble

[Bravotwozero]

Genuine Holden items? I used to get the same thing. Got sick of machining every 5000kms so replaced with aftermarket. Pads should be fine but you may have same problem with aftermarket rotors.

Rotors warping is a myth. Shudder is caused by pad transference on to the rotors. Sometimes you can see it, usually you can't.

[GenReaper]

Mate no ones talking about painting your calipers and rotor hubs, we are saying you need to clean the face of the hub and around the wheel studs where the rotor mates up too so it is spotless and flat you know the hub that houses your hubs bearings.
It is quite obvious you have not done so propperly, if not then you have faulty rotors and i much doubt that.

when i spin the rotor you can hear the pads grab then let go

You said it yourself right there.
Take it all apart and clean the hubs properly.
And if they are cheap rotors and they are now warped do to being missfited then then may need machining again and that may just end up being dearer than buying new rotors again.
Im not taking the piss or trying to be offensive towards you but do it propperly first time and you wont have these problems.
If you dont know what your doing take it to a machanic.
DBA rotors are far superior, you may get away with just cleaning the hubs like you should have but dont count your chickens before they hatch.

[bulldog79]

thanks for your help and yes i did understand what was said a bout cleaning them and what part needed to be cleaned

[Bravotwozero]

Mate no ones talking about painting your calipers and rotor hubs, we are saying you need to clean the face of the hub and around the wheel studs where the rotor mates up too so it is spotless and flat you know the hub that houses your hubs bearings.
It is quite obvious you have not done so propperly, if not then you have faulty rotors and i much doubt that.



You said it yourself right there.
Take it all apart and clean the hubs properly.
And if they are cheap rotors and they are now warped do to being missfited then then may need machining again and that may just end up being dearer than buying new rotors again.
Im not taking the piss or trying to be offensive towards you but do it propperly first time and you wont have these problems.
If you dont know what your doing take it to a machanic.
DBA rotors are far superior, you may get away with just cleaning the hubs like you should have but dont count your chickens before they hatch.

How are they superior? You do realise they're identical? And please explain how a rotor can warp?

thanks for your help and yes i did understand what was said a bout cleaning them and what part needed to be cleaned

Your rotors are not warped but yes they will need machining. If you want a permanent solution then buys aftermarket pads and rotors. DBA, RDA QFM won't make much difference. I've got QFM rotors and pads on my SS and no longer maching every 5000kms.

[bulldog79]

cool thank you its good to get some advice with out getting all the other shit

[Bravotwozero]

A lot of misinformation is given on this site. You may find the following thread useful

RDA disc rotors vs DBA rotors

And for those pushing warped rotor myths, read this...
StopTech : Balanced Brake Upgrades

[bulldog79]

i had a look thank you the info was usefull and i did buy the rotors and i did get the no name pads with them but i did fit them so now thinking maby i sould replace them with some thing better

[wortus]

My car had brake shudder when I bought it and it had genuine rotors and almost new pads, the rotors were machined by the holden dealer that used to service it when that was done and by the time I got it there was shudder. The used car dealer put in these Argent slotted rotors, made in China. I was sceptical but they have turned out to be just fine and they do not shudder, the Holden pads are still in there and when the front ones wear out I will probably use AC Delco pads.

I don't think there is need to buy DBA unless you can get them cheap.

If you have painted the hub surface and/or rotor surfaces that mate together if the paint was not exactly even there will be some run out. All you should need it a very very light smear or grease around the centre of the hub that sticks out, try removing any paint on the hub surface and/or rear of rotor hub if you painted them.