I have ap5000 rotors on the front of my car. During a trackday at Donnington I ran out of brake pads and had some RS14s fitted but now, after a couple of laps, the brake pedal starts to vibrate. Will replacing the rotors fix this or will it cure itself after a few more laps (the rotors dont really need replacing at the mo) ? Can anyone explain why it judders when it gets hot ?
Any help is very much appreciated.
DSE
Mine felt exactly the same, in fact I thought the disc’s were shot, but after a very long cooling down period (3 hours or so) they performed ok again.
Strange, this happended at Brands, but was ok at Croft and Snetterton which is odd.
Oh well, all works fine now.
TADTS
Uneven pad deposits maybe? Mine did this at donny last month, then did it a little bit at oulton, then not at all last week at brands, so maybe they just take a fair while to bed in?
Could also be that you’ve mixed pad compounds, but the 14’s seem that aggressive when cold that I would have thought that you’d soon scrape the old stuff off under normal driving.
Ha you got an S2? ABS and RS14 can be a tricky combo - the aggressive bite nature of the pad can cause the ABS to trigger and cause this.
Give them some stick and it will probably clear up.
I had similar symptoms which I put down to uneven deposits.
After a hard trackday at Ledenon then a gentle drive to the 'Ring I got judder after a few corners. This went away after they got properly warm.
Similarly a couple of weeks ago, after hard use at Snetterton they were juddering the next day in the rain/snow at Oulton. Once I had enough grip to get some heat into them they were OK.
Yup that’s what I got a couple of times then it happened and I ended up having to either get new discs or get them skimmed
BTW Ali, best avatar ever
Hi Jamie, yup 2-11 trying to keep up at the 'Ring.
Mad photographer kneeling backwards in the pax seat.
(yes the roof was off…)
I’ve actually got replacement grooved 308mm rotors to go on in place of the cross drilled ones (grooved are Lotus P/N’s ALS3J0100F (RH), ALS3J0101F (LH)).
Quite a lot of surface cracking on the cross drilled ones so will get them skimmed and see what they’re like…
I’ve a feeling they maybe weren’t bedded in as well as they could have been.
Thats a brave photographer
After my experiences I would recommend either RS42s or RS29s over RS14s for any ABS car
Hi Jamie, yup 2-11 trying to keep up at the 'Ring.
Mad photographer kneeling backwards in the pax seat.
Only joking! It was Andy G, properly strapped in and shooting blind backwards over his head. Mad enough with the SLR strapped to his wrist…
In my experiance RS14’s are absolutly crap and cause loads of problems like this, I don’t really understand how they ahve got such a following. Try 42’s or Performance Friction 01’s
In my experiance RS14’s are absolutly crap and cause loads of problems like this, I don’t really understand how they ahve got such a following. Try 42’s or Performance Friction 01’s
Interesting, I really like the RS14s, better than the 15s and I found the Perf Frictions a bit grabby.
Each to their own.
Hi Ali
If Lotus give you any crap about bedding in I followed the AP bedding in process to the letter.
I also did 200+ road miles before any track work and then on track gradually built up the temps to prevent glazing etc
Sorry you’re having problems
Chris
Thanks Chris, good to know.
In my experiance RS14’s are absolutly crap and cause loads of problems like this, I don’t really understand how they ahve got such a following. Try 42’s or Performance Friction 01’s
I agree 100%, 14s are a bag o sh1te. grabby, overheat the discs, leave deposits causing vibration…load of rubbish IMO.
42 are a completely different world, much much better.