LWells

iTrader: (3)

I recently got Brembo brakes all round, they came with second hand Brembo disc/pads.. The braking was very good, such an improvement over standard.

These were getting low so I decided to "upgrade" ! i.e. DS2500 Pads and Godspeed Grooved discs that are guaranteed against warping even on track days...

I have ran these in for over a week of driving resisting the temptation to brake hard, however last night I decided to see how good this "upgrade" was... to say i am disappointed is an understatement.

I did a couple of braking to junctions etc then did a slow brake from say 70-40 to get some heat in, I then decided to go a little faster and brake with more force (not slamming them on), first couple of times the bite is good and they seem to brake well, however after say 3 or 4 stops (good distance in between and not to 0 just 70 to 30 say) they fade and the braking is terrible :-( is there something wrong with the discs/pads?

how can these be used on a track? They would not work after the 4th corner.

any advice appreciated!!

Ps callipers are perfect; pistons can be moved freely with fingers, very smooth action on the pistons. I also had a lot of smoke from them, this I presume is the coating wearing off? Or could this be copper slip behind the pads getting hot...

172sport

iTrader: (6)

Sounds like you have never bothered to bed them in correctly!

GlesgaKiss

How would you go about bedding them in?

LWells

iTrader: (3)

Yes id like to know how to bed them in if i have not done this, according to the instrutions you use 50% of the braking power for around 25 times, each of 4 seconds. It says they are then ready to use in race situations.

I have never had any problems with new brakes in the past and ive had Ds2500 many years ago.

On top of the above I would always not brakes hard until they have done a hundred miles or more.

What else is recommended to bed them in correctly, as il do this.

dunx

iTrader: (3)

I prefer Performance Friction pads, need a little warm, but just get better and better as you warm them up.

IMHO

dunx

LWells

iTrader: (3)

I just went out and did a lot of 50% braking again then a couple of runs and they seemed to bite nice each time, maybe they will just take time to bed in properly?! I will try later this evening when the roads are quiet and people dont think im mad going up and down braking! one of the discs seems to have some lines around it now, this may clear up i guess on the next braking

dunx

iTrader: (3)

With PF discs and pads it tells you to "boil" them.... they only work properly once a nice shade of blue....

LOL

dunx

Godspeed Brakes

iTrader: (259)

HI
You need to do about 300 miles of normal driving to bed the discs in , then do some high speed hard braking from 80 - 90 down to 30 , drive around to cool them off , then the same again , you WILL fade them using them very hard for the first time , once you have done this they should settle down and be right to use
Cheers Ian

RA Dunk

This is what i did with mine i got from Ian and they work fine on both track and road

bigsinky

like wise. ferodo 2500 compound take some abuse to get them up to temp. i have done loads of heavy braking from 130 at the end of a quarter at elvington and santa pod. no fade what so ever. we are talking abs kicking in here as well. i rate these pads highly as well as the 335mm brembo kit i got from Ian as well.

LWells

iTrader: (3)

just been out again and as per some people say they need some temp to get working properly. Am i expecting to much? when they are warm they brake ok a few times then the pedal becomes harder and not much braking ie fading I presume, when i say harder you push it and dont get the same braking force - maybe its the same feel as normal but without the braking. I have prob done a few hundred miles now. I have never paid as much attention to brakes before! but after a spell of hard driving even the wheels are hot to touch! is this normal?

scoobyc

iTrader: (2)

Yeah know what you mean. I had the same thing but with OE spec pads. My ds2500's when i was running them were an amazing improvement. Especially with a lap of heat in them.

Take your pads out and have a look, see if there is any cracking or scarring or anything.

Im sure hotwheels are fine. Mine get very hot after track, even on the rare road abuse they get very hot.

If they have been bedded in wrongly, can you sand off the top layer??

pedsti

iTrader: (7)

Yes i myself have a 05 sti type u/k and did a full upgrade on the brakes apart from the brembo calipers all round,i used tarox japsport front and rear with redstuff pads steel braided lines a brakestopper and dot5 fluid, but i also find that after three or four hard brakes the pedal no matter how hard you press it the brakes don't stop you!!! very scary to say the least,could it be the combination of pads and discs ect or could it be the A.B.S. or should i try diffrent pads,help on this would be appreciated as it does not give any confidence when going out to play.

LWells

iTrader: (3)

This is my exact problem, I have no confidence any more, is it going to be sharp braking, no breaking, average braking! Its not consistant. Im wondering if the brakes need bleeding properly again or something. I also have the braided hoses so a similar setup I suppose. I dont think the heat is a problem as speaking to a friend earlier who does track days says his get Very hot, but then he also said I may be expecting to much by braking hard over and over agian.

scoobyc

iTrader: (2)

There is a video on youtube of a before and after upgrade of pads in brembos on an evo.

After 10 consecutive 60km-0 stops, they measured the distance. Then did the usual upgrade and did the same braking again. And it stoped iirc 14meters shorted due to less fade.

Might give an example to measure your brake performance against.

pedsti

iTrader: (7)

I was talking to a very respected mechanic who i think came up with a valid reason for this,i explained that my brakes after three or four hard applications their became pretty much no brake,i said it felt like when your being towed with a vehicle with servo assited brakes and the engine not running that was how they felt,the harder you press there is still nothing but a wooden pedal he is now going to check the servo and pipes for a split pipe or a leak on monday, so i'll keep you posted as he said after three or four hard braking the servo sounds like it is struggling to maintain vacum pressure hense the poor pedal,make's sense to me.

arumdevil

how old is your brake fluid?

pedsti

iTrader: (7)

It was changed to dot5 about the end of may this year along with the full brake upgrade.

LWells

iTrader: (3)

yes this is a similar feeling i have but maybe not as bad as if you were being towed / no engine on as this would get really hard pedal.. but what gets me is it was ok until i had the pads/discs changed ie no brake fluid was changed as no pipes off etc

mine was changed prob 6 months ago by the garage who fitted the front brembo's then recently brakes bled again using the stuff Ian sent out when the rears were fitted...

Godspeed Brakes

iTrader: (259)

It sounds to me as you could have glazed the pads going to hard on them when you strated to give them grief , take them out and rub them on some emery cloth , refit them and see what they are like then , do some fairly hard stops between 70 - 30 letting them cool down between stops
They should be working fine then
Cheers Ian

LWells

iTrader: (3)

Ok il give this a go when I get chance to take them out, prob the weekend now. I did leave it a while before giving them some grief.

pedsti

iTrader: (7)

I at last found the problem with my brakes after the full brake upgrade i said the pedal felt like a brake you get when your being towed in a car with servo assited but the engine not running, the pedal after three or four hard stops no matter how hard after that you pressed it was not responding and your left with a wooden pedal in other words no brakes, the guy who looks after my car by-passed the one way vacum valve which keeps the vacum pressure from escaping with a straight through pipe and found that the brake was as it should be, then he replaced the one way vacum valve and hey presto a minted brake, but my car is an 05 sti and is four and a half years old now so may not apply to every car hope this helps some one and the part was only twenty odd quid from subaru so there's nothing to lose.