WRX101

Hi guys. Some time ago I 'upgraded' the brakes on my WRX to Tarox G88 grooved disks with Ferodo DS2500 pads. Thinking this would be a fairly good upgrade without costing a bomb. However, they've never really performed, infact they're worse than the standard brakes and pads I had on before. I've been through two sets of DS2500 pads and still no improvement.
I've replaced and blead the brake fluid and had them checked and there doesn't seem to be anything obviously wrong, just the braking performance is extremely poor!
What els could be causing this? The mechanic mentioned something about it possibly being the servo.
Can anyone advise on what could be causing poor braking performance.

Thanks

stockcar

rears overhauled recently??

WRX101

I had new standard pads put on the rear, they're now about 40% worn and the disks have some slight corrosion around the edges according to Subaru when it went for MOT, but nothing major.

It's just the front aren't good. Feel spongy and nothing to them, you have to press the pedal very hard to get anything out of them. They also seem to overheat very quickly as well, if you do maybe 2 or 3 hard brakes then after that the pedal goes hard and performance is very poor.

gojonnyjo

iTrader: (1)

what flexi hoses u got on to the calipers, std rubber ones will give spongy feeling, get someone to press the brakes and someone to watch the fluid res, if you see bubbles then its the master cyclinder, check for leakage on pipes etc

WRX101

They are just the standard rubber ones, I haven't upgraded them. Do you think braided hoses would give better performance? I will try what you sugested, thanks.
I'm wondering if the problem's something to do with the braking mechanism rather than the discs or pads as I've never heard anyone complain about Ferodo or Tarox. Saying that, since changing performance has never been very good.

alcazar

iTrader: (2)

Have you had the brakes bled, at all? Spongey-ness is often air in the system.

Also, aren't DS2500 pads hard? And don't they need to be pretty warm to do much?

Maybe you have a poor pad/disc match?

stockcar

if your using poor rear/std rear pads then you can cause the front to overheat as its forced to do more work (and hence generate heat), would normally keep the front & rear compounds similiar
also ensure all sliders/pistons are moving freely and the pads are jammed/trapped in the caliper - lastly it does sound like you still have air or deteriorated fluid in the system??

just a daft one you haven't had the calipers off and fitted them with the bleed nipples facing down at all???

alyn

WRX101

Stockcar: No, I haven't had the calipers off. What would you suggest to be done then? Strip the brakes down and look where for problems? In the pistons and sliders? Sorry but what are sliders?

Alcazar: Interesting that you say about poor pad/disk match because it always felt like the discs over heated before the pads came up to temperature or vice versa.

s70rjw

iTrader: (2)

I have the DS2500 pads fitted alongside DBA Wiperslot 4000 slotted discs. I have not experienced any fade since upgrading some 2 years ago. They are light years ahead of the OE setup, except for the first application when cold when they feel wooden.
I've fitted braided hoses and DOT 5.1 fluid to finish off, together with Ian Godneys Slotted discs and kevlar pads at the rear.
Based on my experience, I can only suggest either discs are not upto the task, or you have a mechanical / hydraulic issue.

scooby1929

iTrader: (1)

Sounds very much to me that the system was not bled properly. There is also a specific order that it shud be done.

I would also check that all pistons are moving freely

dexster81

iTrader: (1)

Are you SURE the disks are on the right sides ie the internal grooves (not the ones touching the pads the ones between the disks as vented) should draw heat away from the hub sounds like what I had with K-sport set up lots of arguments on here about which way the internal groove should be but it sorted mine

gojonnyjo

iTrader: (1)

any update on this