GolfGTIforum.co.uk
Model specific boards => Golf mk2 => Topic started by: Benrevs on 24 September 2008, 13:11
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Was driving home last night with 2 others in the car. Came to the end of a dual-carriageway doing about 82 :lipsrsealed: put the anchors on and they just completely faded, had trouble stopping so pulled in at a petrol station and there was smoke pissing off my brakes and the discs are now blue... have I got too much happening on the front brakes and not much on the back?! The pads are around 2 months old and discs are in good nick. any thoughts? cheers
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Eeek that's not good. A possible suspect for this could be boiling your fluid and some of it leaking onto the discs. When was the fluid last changed?
Nick
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The whole system was flushed and changed along with the master cylinder around 2 months ago, did have a look down me reservoir and seemed all ok. Im thinking it may be the crap choice in pads, ie halfrauds or my rears are out of bias?
and only the fronts are doing anything?
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Most of the braking is on the front anyway. If your rears were not working you'd just get a bit of sideways action, not cooking the fronts.
Nick
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Have you checked the pads yet. A fluid change and a good going over the system would be a good idea. If your discs are blue then they could likely be warped from the excessive heat. So factor in new discs, pads and a fluid change, also caliper seals
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Guess i posted same time as you! :smiley: I was aware the rears didnt do much but was unsure of how much.lol
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What are the brakes on your car? 239, 256 or 280mm?
If they're 256 or 280 then you've bought crap pads and/or rotors.
I can heartily recommend 280mm Zimmerman discs and OE spec pads as they've done 24 laps of the 'ring and three track days at Combe and the pads are only now just about done.
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the discs are 280mm vented and have been fine for ages and the pads just halfords own as i was on a budget! It just seems that it was because of the extra weight that i dont usually have in the car as i didnt break all that hard. Is fine now they are cooled and tis only me in the car. Who stocks these discs you speak of?? cheers
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Most places should know Zimmerman.
Mine either came from GSF, EuroCan'tParts or Vee W Services (who'd be cheaper and betterer than ECP or GSF).
The big difference to other rotors I've seen is that they have vent holes around the bell, allowing for better disc cooling. By the sounds of it the Halfrauds pads are the issue here though.
How much 'extra weight' did you have in the car at the time? Weight has a big impact on brakes.
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the discs are 280mm
You not got the wheels in your sig anymore i take it?
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Brake discs going blue is usually not detrimental to the disc. It happens a lot on track days etc and they return to normal after more typical driving :smiley:
As you have found out - the blue colour is caused by excessive heat. As others have said it could be poor quality pads or not bedding in properly. I would also suggest a lazy caliper or sticky sliders and if your alloys get hot with normal driving this seems likely. Problems like you describe should only happen after a few high speed brake - accelerate cycles, even under load, but if your brakes were already hot.........
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Cheers, i only had one in the back and the front.. but they wernt the smallest! Was mostly curious because it hadnt happened before, gunna try some different pads I reckon. If not, new discs!
As for the wheels, they are being saved for the summer and occasions. :wink:
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well you did say you had halfords own pads, they are utter crap stupidly easy to fade and once they have been got proper hot they don't last long that smoke is the resin that holds teh pad together burning
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Check that your calipers are not sticking slightly! If the discs have turned blue, they must have heated BEFORE you hit the breaks, boiling brake fluid, causes brake fade.. think about it
Halfords brake parts will meet a british standard, and should easily cope with a relatively light car, 3 up, from @80mph
check the calipers, and replace if required, and replace the flexi hoses, along with some fresh brake fluid from an unopened container, re-bleed ALL the brakes
Tom
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with 280mm brakes you will normaly feel if you have a binding calliper you'll feel the car stop unevenly as one side will be hot and the other not also you'll smell it when pooteling allong.
also meeting british standard dosen't mean a lot really. compared to other pads they are crap end off. fadeing is also mainly caused by the pad, as the pad gets HOT it starts to gas, this gas then forces it's way out pushing the pad away from the disk. also during this prosses the pad has a nasty habbit of glazing whitch means it'll have a lot less bite till the glaze wears off mainly why grroved disks are avalible, to vent the gas from pad and remove said glaze from pad. with any resoanble pads you should be able to get the disks glowing with good pads you should be able to get them glowign quite brightly
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Crap pad - Mainly metal based - hard
Good pad - Mainly fibre based - soft