simple brake question

[martins]

At KH on the 17th.

When brakes got hot (after 2 or 3 laps) started to get vibration and poor brake performance. When cool no issues other than not great brake capability but not as bad as when hot. No idea what pads are fitted. Went to look to see what pads fitted but seem to have misplaced my large 8mm Allen Key. Tried to 'drive through' but no improvement. Do I simply need new pads or could the issue be more serious.

Thoughs welcome.

S2 Exige 240, MY 2010.

Martin

[mckeann]

i believe a few of the ABS model race cars in the LOT series used to suffer from pad transfer onto the disc when using pagid rs14's, but were ok with 42's. MIGHT be that, but hard to be sure.

[robin]

The pads are removed from the front with a little pair of pliers to pull out the R clips and then remove one of the slide pins, catch the spring plate that will go flying and then remove the other slide pin. Now the pads withdraw from the slots in the caliper.

Not sure what the 8mm allen key was for, but just in case you were trying to undo the two big bolts that hold the caliper to the upright, you don't need to.

Cheers,
Robin

[Stu160]

Hi Martin

Your car will have 4 pot ap calipers?

It will be a pad issue, perhaps changed from 1 type of pad to another, and the pad deposit will cause brake issues. Take the discs off, and clean the disc surface with sandpaper, of an orbital sander, to remove any pad transfer, and do the same on the pad, coarse glass paper if quite good on a flat surface( if the pads are still ok) and refit. then bed them in and start again.

You cant change from pagid to cl pads for example without doing this (in my opinion, but hey, I am sure I will be wrong and what I have said not the way to fix it, but it works for me )

Stu

[Clarkie]

Martin,

Does your car have the 4 pot big brake kit? If so to take the pads out you just need to tap the pins out 1 x top, 1 x bottom.

There are spring collars on the end of each pin that retain them in the caliper when tapped back in

There is a lot of pad transfer with the RS14 pads, you'll see and feel this on the disks clearly, they will clean up again after a few road miles.

On track as you've experienced when they get hot they make a hellavu noise and you can feel the rumble through the pedal. Doesn't seem to affect the braking performance just doesn't feel great underfoot

I just swapped to Carbone Lorraine RC6's for the weekend and the difference is night and day, not so wooden brake pedal and very powerful initial bite, in fact it takes a bit of getting used to!

No noise/rumble through the pedal even when pretty hot. Disks are clean after SIDC with no pad transfer

Cheers

Clark

[mckeann]

Hi Martin

Your car will have 4 pot ap calipers?

It will be a pad issue, perhaps changed from 1 type of pad to another, and the pad deposit will cause brake issues. Take the discs off, and clean the disc surface with sandpaper, of an orbital sander, to remove any pad transfer, and do the same on the pad, coarse glass paper if quite good on a flat surface( if the pads are still ok) and refit. then bed them in and start again.

You cant change from pagid to cl pads for example without doing this (in my opinion, but hey, I am sure I will be wrong and what I have said not the way to fix it, but it works for me )

Stu

I've never actually had the issue, i've only heard of it on the ABS cars. Might be due to the ABS, or maybe coz they're 200kg heavier than an S1???? Either way, what Stu says will work a treat, but the folk who raced with pagids on ABS cars in 2007 still seemed to suffer, it kept coming back.

[Mikie711]

Hi Martin

Your car will have 4 pot ap calipers?

It will be a pad issue, perhaps changed from 1 type of pad to another, and the pad deposit will cause brake issues. Take the discs off, and clean the disc surface with sandpaper, of an orbital sander, to remove any pad transfer, and do the same on the pad, coarse glass paper if quite good on a flat surface( if the pads are still ok) and refit. then bed them in and start again.

You cant change from pagid to cl pads for example without doing this (in my opinion, but hey, I am sure I will be wrong and what I have said not the way to fix it, but it works for me )

Stu

If you have cross drill disc's you may well find all the holes are full of brake dust. Clear these out while you have the discs off, or indeed even with them on the car. Had this recently with the Evora and it gave very similar symptoms.

[martins]

have learned a lot in the past 12 hrs.

was trying to remove the caliper from the hub could never understand why people on here could change their pads so quickly. on the s2 elise i did not have an issue as i spent a whole weekend after getting the car freeing up the 8mm allen bolts in question and thereafter keeping them free and easy

it is the 4 pot calipers that are fitted and all of the disk holes are full of dust.

the disks seem pretty even with no lip.

will get one of the wheels off tonight and see what pads i have and take it from there.

looks like i might have to invest in the RC6's before the next track day

thanks for all the advice to date. feel free to comment further if anything else comes to mind.

Martin

[tut]

Good luck with the RC6's, they trashed my discs in one short track session.

Changed to RC5+ after that.

tut

[Scotty C]

yes but he will have AP disc and not ones made from cheese.

[Clarkie]

Good luck with the RC6's, they trashed my discs in one short track session.

Changed to RC5+ after that.

tut

Was it steel or MMC discs?

S1 disks are smaller than S2, less weight to slow down

Jury is out on the RC6's but my first impressions were good. Read that the pad can come away from the back plate but have been assured this is prevented by driving the car after washing to dry the pads.

Discs were all cleaned thoroughly and rubbed down with emery to remove the RS14 pad transfer prior to install

Packed in quite a few laps on Saturday and no disc issues at all

We'll see...........................................................

[neil]

yes but he will have AP disc and not ones made from cheese.

Are you sure? The standard 308's on mine were cheesy (now replaced by AP's)

[mikeyb13]

yes but he will have AP disc and not ones made from cheese.

Are you sure? The standard 308's on mine were cheesy (now replaced by AP's)

You wont be selling those in the classifieds then

[Clarkie]

yes but he will have AP disc and not ones made from cheese.

Are you sure? The standard 308's on mine were cheesy (now replaced by AP's)

Standard drilled discs only lasted 2k miles on mine. Swapped to grooved AP rotors under warranty and haven't had a problem since

[alicrozier]

Likewise on my Exige I had pad transfer and swapped from std 308's cross drilled to grooved AP rotors (std cross drilled are still AP so shouldn't be cheesy Neil?).