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Model specific boards => Golf mk3 => Topic started by: axewielder on 11 August 2009, 12:47

Title: disks under thickness
Post by: axewielder on 11 August 2009, 12:47

Hey guys my front disks are at least 4 mm under min specified thickness, pads have loadsa life left though, just wondering if theres much of a problem with this or just leave it until the pads need doin?
There is the thick lip round the outside where it hasnt worn, this is the only thing i can think of that might be a problem but i can easily grind these off.

Title: Re: disks under thickness
Post by: Wayne on 11 August 2009, 12:57

I would change the discs asap, much safer.

Title: Re: disks under thickness
Post by: gtigolfthree on 11 August 2009, 12:59

As above your brakes will overheat

Title: Re: disks under thickness
Post by: AudiA8Quattro on 11 August 2009, 12:59

If you keep running the discs they could crack or actually start to break up eventually.

Title: Re: disks under thickness
Post by: axewielder on 11 August 2009, 13:00

yeha i get the cautious point but i was wondering if there is any 'real' problems that will arrise from under size disks, there is pleanty of metal left, and it breaks fine? they are vented so i doubt they will overheat under just normal use?

Title: Re: disks under thickness
Post by: AudiA8Quattro on 11 August 2009, 13:02

The less 'meat' on the disc, the less it can dissipate heat.

Title: Re: disks under thickness
Post by: axewielder on 11 August 2009, 13:12

yeh i know but im not ignoring you guys, makes sense i was just thinking there is pleanty of meat left, plus they are vented and i really dont do any hard breaking so i cant really just see them overheating, yes im sure they wouldnt like being taken to the track but many cars have solids and can cope fine with heat dissipation. Just curious as to other things that i may not have thought of?

Title: Re: disks under thickness
Post by: AudiA8Quattro on 11 August 2009, 13:16

I don't think you are getting it mate.
You are just thinking of the surface area of the disc, instead think of it as cubic area.
The less cubic area, the more the disc will heat up. Once it is below the manufacturers minimum thickness, the brakes will start to overheat, and that is just for normal road use.
This could lead to brake fade, cracks, or the disc breaking up.
Not that many cars have solid front discs now as they are crap  :laugh:

Title: Re: disks under thickness
Post by: axewielder on 11 August 2009, 13:26

No i get you man probebly wont risk, sorry if i was sounding ignorant+ stuff, appreciate your input  :smiley:

Title: Re: disks under thickness
Post by: Matty-MK3 on 11 August 2009, 18:49

Deffo get them done. It's really not safe at all. If they crack, then you have no brakes.  :shocked:

Title: Re: disks under thickness
Post by: karlos28 on 12 August 2009, 12:41

small detour if thats alright.. mine has a similar thing.. but the discs are solid.. i dont have any choice but solid discs again do i.. unless i replace the calipers coz the vented ones are wider, correct?

Title: Re: disks under thickness
Post by: axewielder on 12 August 2009, 13:38

yep solids are like 10-12mm and vented are 22 so most likely new calipers but not sure they would bolt straight up, might need a spacer? have to ask someone whos done it.

Title: Re: disks under thickness
Post by: karlos28 on 12 August 2009, 18:18

think il stick to solids.. makes life much easier! maybe get some drilled ones..?

Title: Re: disks under thickness
Post by: axewielder on 12 August 2009, 18:54

id go for grooved if anything, the holes encourage cracks to form lol

Title: Re: disks under thickness
Post by: gtigolfthree on 12 August 2009, 19:04

Pinched this from the mk4 section its a good read anyway.
http://uk-mkivs.net/forums/t/153276.aspx

Title: Re: disks under thickness
Post by: VW BUSH on 12 August 2009, 19:30

If you are in an accident and your car gets checked over and the discs are under size it will void the MOT and insurance etc and you could be looking at bird :sick:

Title: Re: disks under thickness
Post by: axewielder on 12 August 2009, 19:49

yeh ok enough with the safety advice ive said ill change them :wink: