xa0s
Banned
Registered: 4th Mar 08
Location: Dartford, Kent Car: Turbo'd Fabia vRS
User status: Offline
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so my car is a fabia vrs mk1
i bought brembo's for it, very similar to those on cupra r (almost identical). the guy that refurbed them sold them with ebc grooved/drilled discs. i then got ds-2500's
gone through 3x sets of pads (£120 a pair) in 4,000 miles and now ive noticied there's cracks in the disc
after heavy braking (140mph -> 0mph) or lots of 80mph -> 40mph it starts knocking (rotationally), almost like it has warped discs... but if u brake gently for a while and bed them in it fixes itself and brakes/drives normally
cud this be maybe warping once hot, but fine when warm? or what?
new set of pads being fitted this week but ideally want to get some discs too but dunno what ones to get. dont like the idea of plain discs, they look boring, but also want something that is not gunna do this again.
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
User status: Offline
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No such thing as warped discs, will be pad material transfer, new discs needed
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AndyCorsaSport
Member
Registered: 12th Feb 06
Location: Horsforth, West Yorkshire
User status: Offline
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How the fuck can you do 3 sets of pads in 4k?
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FAZ
Premium Member
Registered: 24th Nov 07
Location: Coventry
User status: Offline
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20mph hit & runs
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tom130691
Premium Member
Registered: 13th Sep 08
Location: Daventry
User status: Offline
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quote:
Originally posted by AndyCorsaSport
How the fuck can you do 3 sets of pads in 4k?
140-0 clearly 
sound light somethings not right extra usage of pads and knocking
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Ian
Site Administrator
Registered: 28th Aug 99
Location: Liverpool
User status: Offline
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quote:
Originally posted by xa0s
it starts knocking (rotationally), almost like it has warped discs... but if u brake gently for a while and bed them in it fixes itself and brakes/drives normally
Pad deposits.
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xa0s
Banned
Registered: 4th Mar 08
Location: Dartford, Kent Car: Turbo'd Fabia vRS
User status: Offline
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quote:
Originally posted by Ian
quote:
Originally posted by xa0s
it starts knocking (rotationally), almost like it has warped discs... but if u brake gently for a while and bed them in it fixes itself and brakes/drives normally
Pad deposits.
hm, thing is after i done my bedford track day and was HARD on the brakes, it took like a week for the brakes to not knock anymore, would that make sense?
how can i stop this from happening again with new discs? are there any types of discs that are better to prevent it etc?
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
User status: Offline
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Don't sit with your foot on the brakes with v hot discs eg at s junction after using heavy braking
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xa0s
Banned
Registered: 4th Mar 08
Location: Dartford, Kent Car: Turbo'd Fabia vRS
User status: Offline
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quote:
Originally posted by Steve
Don't sit with your foot on the brakes with v hot discs eg at s junction after using heavy braking
yeh i try and never leave handbrake on, always try to roll towards lights rather than stopping etc. im careful but its still happened
but why do i need new discs if they return to normal after a bit? then after one hard braking session they fucked again
[Edited on 30-08-2011 by xa0s]
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FAZ
Premium Member
Registered: 24th Nov 07
Location: Coventry
User status: Offline
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if they return to ""normal"" they wont need replacing?
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
User status: Offline
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My discs used to do it on my puma on track, but not under normal driving. You could physically see the outline of the pad imprinted on the discs
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_Allan_
Member
Registered: 24th Mar 04
User status: Offline
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Good One
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AndyCorsaSport
Member
Registered: 12th Feb 06
Location: Horsforth, West Yorkshire
User status: Offline
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To be honest, mines doing this on the 106, i thought it was warped disc's also.
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--ToM--
Member
Registered: 23rd Nov 07
Location: Wirral
User status: Offline
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discs can warp, but as already said leaving foot on the brakes after heavy braking not allowing the disc to cool evenly and leaving uneven spots on the pad face also causes it, id replace both and also drive a bit less like a penis and you may also get more than 3 sets of pads in 4k miles
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
User status: Offline
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Plenty of experts would disagree a normal eg, road disc wont warp, these are people that measure hundreds of discs with 'warping' complaints and have never found a warped one yet . It's a myth, and is almost always caused by pad deposits
[Edited on 30-08-2011 by Steve]
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smcGSI16V
Member
Registered: 26th May 03
Location: Farnborough Drives: Thurlby 888 CDTi No.98
User status: Offline
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quote:
Originally posted by Steve
No such thing as warped discs, will be pad material transfer, new discs needed
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Ben G
Member
Registered: 12th Jan 07
Location: Essex
User status: Offline
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can't say i've ever needed to do a 140mph-0mph brake 'test'
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smcGSI16V
Member
Registered: 26th May 03
Location: Farnborough Drives: Thurlby 888 CDTi No.98
User status: Offline
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Me either.
And 3 sets in 4k is stupid. You must be doing somehing wrong.
And you get away lightly, my pads cost £220 and they are ds2500 and I have had them on the car 10k.
You must drive around constantly on the brakes like most annoying Merc drivers.
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antnee
Member
Registered: 30th Dec 07
Location: Cov Drives: Clio 197
User status: Offline
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You must drive like an absolute cock to do that many pads in 4k
My friends MR2 Race car has done about 15 15min races, plus 5 20min qualifying and about 4 test days and the pads are still fine.
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xa0s
Banned
Registered: 4th Mar 08
Location: Dartford, Kent Car: Turbo'd Fabia vRS
User status: Offline
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done a full day at bedford which probably done most of them, around 5 hours on track i think. literally 5 hours on the track itself.
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Ian
Site Administrator
Registered: 28th Aug 99
Location: Liverpool
User status: Offline
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quote:
Originally posted by Steve
It's a myth, and is almost always caused by pad deposits
I've seen warped discs, but on a car where the disc wasn't sitting true on the hub because it was chipped, so every revolution it got hot on the proud bit.
But yeah, special case.
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Graham88
Member
Registered: 16th Apr 07
Location: South East Kent Drives: E46 M3
User status: Offline
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Skim the discs?
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
User status: Offline
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That's another option what graham said
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AndyCorsaSport
Member
Registered: 12th Feb 06
Location: Horsforth, West Yorkshire
User status: Offline
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Ahh so it's hard braking, like to a stop, then leaving foot on the brakes? I need new brakes again then
I've done 1 track day at Croft, probably a good 4 hours on track. I have cheap disc's and mintex pads.
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0775kieran
Member
Registered: 28th Apr 10
Location: Bolton, Greater Manchester
User status: Offline
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after heavy braking (140mph -> 0mph) or lots of 80mph -> 40mph it starts knocking (rotationally), almost like it has warped discs... but if u brake gently for a while and bed them in it fixes itself and brakes/drives normally
Is this happening on a driveway? If so get the hose out to cool them off.
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