you've boiled the brake fluid, and in doing so created air pockets.
the fluid needs to be free of air to work properly... oh, and the juddering first time out will probably be the disks warping.

time for new disks, pads and fluid.

 

Been searching Google even more, and it pretty much seems like its air from boiling the brake fluid. So gonna need to change it then. Dont think the disks are warped, because it only happened once. If they are warped, then surely I would get a shudder constantly...but I only got it that once (maybe was catching on some dirt - dunno?)

Try changing the brake fluid, and bleed the brakes. That should fix the problem. You also might have warped the disks, but I doubt it. That would explain the shuddering though.

If the above does not fix it you may well have glazed your brake pads by taking them over the specified operating temps (not that hard when using std). Some of the symptoms you have mentioned sound correct.

As per another post (for ChunkyMonkey), Im not really a brake man so hopefully someone else can confirm.

Gonna check it all, disks, pads and brake fluid

Could be many things, spongeyness is most proberly boiled brake fluid. change it and see how it feels.

as also said you could have over heated the discs and they could have become glazed, this will screw up braking due to the pads not being able to grip the disc's to slow you down.

Thanks, will be checking all

dot four brake fluid doesnt need changing till it boils at 156 degrees (somewhere around there) dont 5 has an even higher boiling point. so to make it boil on the first time out like that is some going. Of course if the car hasnt had its fluid changed for a few years this will become lower but then u would of made sure everything was tip top b4 going on a track day right?

i would be more inclined to think u have cooked the pads and disks especialy as u felt judder and saw smoke the first time.

if i were u i would strip ya brakes and replace everything unless u wish to take it to a garage and get them to check ya disks for run out and warping.

hope this helps
coop

Thanks. Yeah...all was fine before the day. It was a Cobra Club track day...and I did push it quite a bit. Beat 9 Cobra's lap times in my little 1.8 But ja...gonna hop over to a friends this weekend and give the brake system a once over.

Thanks to all for the help!!!

 

Try changing the brake fluid, and bleed the brakes. That should fix the problem. You also might have warped the disks, but I doubt it. That would explain the shuddering though.

 

If the above does not fix it you may well have glazed your brake pads by taking them over the specified operating temps (not that hard when using std). Some of the symptoms you have mentioned sound correct.

As per another post (for ChunkyMonkey), Im not really a brake man so hopefully someone else can confirm.

 

Could be many things, spongeyness is most proberly boiled brake fluid. change it and see how it feels.

as also said you could have over heated the discs and they could have become glazed, this will screw up braking due to the pads not being able to grip the disc's to slow you down.

 

dot four brake fluid doesnt need changing till it boils at 156 degrees (somewhere around there) dont 5 has an even higher boiling point. so to make it boil on the first time out like that is some going. Of course if the car hasnt had its fluid changed for a few years this will become lower but then u would of made sure everything was tip top b4 going on a track day right?

i would be more inclined to think u have cooked the pads and disks especialy as u felt judder and saw smoke the first time.

if i were u i would strip ya brakes and replace everything unless u wish to take it to a garage and get them to check ya disks for run out and warping.

hope this helps
coop

 

dot four brake fluid doesnt need changing till it boils at 156 degrees (somewhere around there) dont 5 has an even higher boiling point. so to make it boil on the first time out like that is some going. Of course if the car hasnt had its fluid changed for a few years this will become lower but then u would of made sure everything was tip top b4 going on a track day right?

i would be more inclined to think u have cooked the pads and disks especialy as u felt judder and saw smoke the first time.

if i were u i would strip ya brakes and replace everything unless u wish to take it to a garage and get them to check ya disks for run out and warping.

hope this helps
coop

Dot 4 or dot 5 brake fluid will boil high, but it will need changing a couple of times in the cars life. Brake fluid is hydroscopic, meaning it absorbs water and over time will become weaker and weaker.



Also, if you have 'cooked' your brake pads, they will have become brittle and proberly wil be cracked. have a look at them.

 

Aye, just re-bleed the brakes and have a look at the pads while you are at it.
Should sort the problems out not worries

 

If not renewed recently, renew the brake fluid in the system even if it was not boiled on that track day. It will be beneficial even if it is the case that the pads and/or discs need renewing after all.

If they were smoking a lot chances are you have boiled the fluid. Did you experience any brake fade on the track when they were smoking ~ even if you allowed them to cool between laps.
..

 

Ok...thanks again for replies!

Brakes were fine in the laps...no difference in grab quality...was only after that it was noticable. Friend of mine and I gave the disks a clean (there was quite a lot of gunk on them), and took the pads out and gave them a clean too. After that...all seems fine again...so glad about that. Will be changing the brake fluid with the next pads

Thanks again!