Brake disc need to machine or not

[ken]

I found this quote on bendix web site.

We recommend that rotors are machined only if they exhibit disc thickness variation (a shaking steering wheel and/or pulsating pedal on brake application), severe scoring, runout or heat checking.

I am going to change my rear brake pads soon. I am not sure if my disc need to machine or not?

How do I know if I need to machine the discs? Can I judge it by see it and touch? maybe shiny and smooth?

Thanks

[2BNVS]

my discs started to go on me recently, but a very good friend of mine who tunes skylines and other high performance vehicles strongly suggested that i replaced them not machined them, the discs start to get really shinny and have like a glossy look on them, i replaced mine with slightly larger ones.

[(B1) MR_fanny]

i just changed all 4 pads today and had the disc machined also. the rears were very noticable as u could clearly see where the metal indicator was rubbin on the disc's......it was bumpy and uneven. i guess u can tell by lookin and rubbin ur fingers over it. the fronts werent as bad but i had em done anyways. i think they also help aviod that squeakin problem. its a cheap alternative but if u have the dosh change em like 2BNVS did.

[silver gts-t]

u can tell by driving around 75km/h and braking a lil hard n see how smooth it is, if it is smooth then its all good but if u feel shaking or shuddering u need to get them machined.

john

[ScarifieR]

when machining ya should replace the discs after or not

my fronts r a bit bumpy

but not noticable when ya drive

[benm]

My old stock rotors were machined twice before i replaced them. Machining them is fine until their is nothing left to be machined. If you replaced your rotors instead of machining them you'd be up for rotors once a year.

[Duncan]

heh, mine have been machined every 3 months for 2 years now, still haven't made it down to the wear markers.

If you have more aggressive pads you'll always have to machine.

[ray32]

Sorry to bump an old thread, but didn't want to start a new one.

My brakes have been shittin' me for the past few weeks.

After braking at speeds of above 60ish the brakes will make a sort of creaking noise and the steering wheel will kind of shudder a little with a bit of noise.

Am I right in assuming I definitely need to get my rotors machined?

Edited October 29, 2008 by ray32

[Vik]

Same boat as me, when hitting high revs going at 70 or 80 and trying to break, they dont make a noise but they start to shudder really bad, Need to bet them machined.

Got other pair of rotors sitting at home, theyre bigger, and dunno if they will fit.

MRXTCZ

[ray32]

Anyone know how much it is roughly to get all 4 machined? Or as I read previously am I better off getting newer/better set?

cheers