Keith C Posted July 16, 2002 Share Posted July 16, 2002 Which discs should I get for my UK MKIV? I currently have Porterfield pads, braided hoses, Dot 5.1 fluid, blah blah, but after a couple of high-speed stops I've managed to glaze the discs, and the brakes aren't behaving as well I think they ought! Any recommendations? Cheers Keith Link to comment Share on other sites More sharing options...
Nic Posted July 16, 2002 Share Posted July 16, 2002 I've just ordered a pair of Project-Mu front discs which are very good quality see: http://www.project-mu.co.jp/e/product/scr-pro.html Paul W also has some on his site. Link to comment Share on other sites More sharing options...
Guest Terry S Posted July 16, 2002 Share Posted July 16, 2002 If you don't mind me asking Nic, how much were they & are they the 2 piece ones?? Will they sell direct to the UK? Keith the Stillen ones are OK ( Slotted) Link to comment Share on other sites More sharing options...
Nic Posted July 16, 2002 Share Posted July 16, 2002 Terry Yes they are the 2 piece ones, I'll try and find out what the cost was, from memory they were not much more than the OEM Toyota discs. Link to comment Share on other sites More sharing options...
Guest Terry S Posted July 16, 2002 Share Posted July 16, 2002 Nic, I looked at these on the Suprastore site & they are silly money. Would be very interested. Link to comment Share on other sites More sharing options...
Rich J Posted July 16, 2002 Share Posted July 16, 2002 try http://www.takakaira.co.jp/ if they don't list them send them a mail with the ones you want and a link to the website, they are usually very helpful, and will probably quote yo close to the website price (+ shipping) COst on Jap site of project-mu website http://www.project-mu.co.jp/product-folder/rotor/scr.html Link to comment Share on other sites More sharing options...
GavinL Posted July 16, 2002 Share Posted July 16, 2002 Originally posted by Keith C Which discs should I get for my UK MKIV? I currently have Porterfield pads, braided hoses, Dot 5.1 fluid, blah blah, but after a couple of high-speed stops I've managed to glaze the discs, and the brakes aren't behaving as well I think they ought! Any recommendations? Cheers Keith Interesting ...what Porterfield race or street and how do you recognise glazing? thanks......Gavin Link to comment Share on other sites More sharing options...
Rich J Posted July 16, 2002 Share Posted July 16, 2002 Originally posted by Keith C I've managed to glaze the discs[/b] I thought it was pads that got glazed? Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 16, 2002 Share Posted July 16, 2002 Originally posted by HardHead42 I thought it was pads that got glazed? Pads and / or discs can glaze, but it's not usually a problem with modern carbon / kevalr pads. More of one in the old days with ultra hard organic pads that left a "glaze" of the adhesive used to hold the particles the pad is made of together, either on disc, pad surface, or both. A light sanding with emery cloth will sort it. I'd be very surprised if Pauls Porterfield pads would glaze, not typical carbon pad behaviour at all. Link to comment Share on other sites More sharing options...
Keith C Posted July 16, 2002 Author Share Posted July 16, 2002 Maybe I've got it wrong then. The discs are taking on a blueish colour, with some bits sort of reddish (fancy techy terms ). It looks like the discs have got very hot, and discoloured as a result. I was told that was glazing, but it's highly likely I'm wrong. Also, the pedal now feels substantially different. I now have to push it harder for the same result, especially after a couple of hard stops, and while I get the feeling it'll stop the car if I ask them too, it's rather disconcerting. It's tricky to describe, as a lot of it is subjective feeling. Link to comment Share on other sites More sharing options...
Guest Martin F Posted July 17, 2002 Share Posted July 17, 2002 Originally posted by HardHead42 try http://www.takakaira.co.jp/ if they don't list them send them a mail with the ones you want and a link to the website, they are usually very helpful, and will probably quote yo close to the website price (+ shipping) COst on Jap site of project-mu website http://www.project-mu.co.jp/product-folder/rotor/scr.html I would also go for Project Mu disk's. Checkerflag can supply these, take a look at :- http://home.catv.ne.jp/dd/checker/overseas/checkerflag.html Link to comment Share on other sites More sharing options...
Rich J Posted July 17, 2002 Share Posted July 17, 2002 Originally posted by Martin F I would also go for Project Mu disk's. Checkerflag can supply these, take a look at :- http://home.catv.ne.jp/dd/checker/overseas/checkerflag.html I have delt with Checkerflag before also, very helpful guys can't pay by CC which is a bit of a pain but good apart from that. Link to comment Share on other sites More sharing options...
Doughie Posted July 17, 2002 Share Posted July 17, 2002 Originally posted by Keith C Maybe I've got it wrong then. The discs are taking on a blueish colour, with some bits sort of reddish (fancy techy terms ). It looks like the discs have got very hot, and discoloured as a result. I was told that was glazing, but it's highly likely I'm wrong. Also, the pedal now feels substantially different. I now have to push it harder for the same result, especially after a couple of hard stops, and while I get the feeling it'll stop the car if I ask them too, it's rather disconcerting. It's tricky to describe, as a lot of it is subjective feeling. Hi Keith Brake History of your motor Those front disks on your car were OE Toyota disks, brand new on the car in February or March this year ! £180 they were. Can't believe you've trashed them already. The front and rear pads are Porterfield R4S pads ("fast road / light race"). The fronts are the very pads that I bought from Paul Whiffin at RAF Bentwaters last year. Gavin had actually bought them, but then i trashed a front set of pads in 2 short sessions and needed front pads just in order to drive home ! (thanks Gav - you saved me that day...) (The Bentwaters track day was on the old front disks.) As Chris said, glazed disks usually happens when you haven't been braking hard *enough*. a few hard stops usually takes the glaze *off*. Earlier this year i got the disks, braided hoses fitted and DOT 5.1 fluid done all at the same time, in addition to the front caliper overhaul kit (from Toyota). All that made a huge difference to the braking of the car. Darryl Payne and I did the whole thing and when we did the overhaul kit, we found that the pistons in the front caliper (especially front right caliper i think) were sticking quite badly. The overhaul kit (piston seals etc.) sorted it completely. I would try a few things : 1) thoroughly bleed the brakes to check that there's no air in there. We had to bleed the brakes twice and i think there may have been just a little bit of air still left. 2) Fit some new stock Toyota pads, and run them in for about 100 miles before braking too hard. Having tried both stock Toyota pads, and Porterfield R4S pads (expensive!) I am of the firm opinion that the stock pads are actually pretty damn good. Certainly Gavin's UK car stopped bloody well on stock pads at RAF Bentwaters, wheareas my R4S pads literally melted to the disk (ask Martin or Gavin - they will tell you ....) 3) if that doesn't have the effect you want, i would take the front calipers off and pop the pistons out (using a compressed air line) and clean them all up. They may be sticking again, though i'd be surprised after only 6 months. The Toyota overhaul kit comprises replacement piston seals and some other bits and pieces. very good value at about £27 incl.VAT., and made a big difference. 4) I've heard Chris Wilson say that the rear calipers can seize a bit on mkiv's that are 5-7 yrs old. If this has happened, then your car would stop, but it would reduce the braking. Overhaul of rear calipers might be a good move. I think Toyota may do a rear brake caliper overhaul kit, in addition to the front caliper overhaul kit mentioned above. If all the above fails, then you're a born racer, last of the Late Brakers, and i advise you to send off an application form to McLaren International immediately. cheers Link to comment Share on other sites More sharing options...
Keith C Posted July 17, 2002 Author Share Posted July 17, 2002 Cheers Stu - one question though - do the Porterfields behave differently when warmed up? It's occured to me that all I'm experiencing is the effect of the pads warming up, and it's just because I'm not used to it that it feels funny. I find it tricky to believe I've munched the discs as my MKIII ones stood up to a lot more abuse than I've given these ones. Link to comment Share on other sites More sharing options...
Doughie Posted July 17, 2002 Share Posted July 17, 2002 I can't remember the pads being noticeably different "cold" to when they'd warmed up. A full race pad will take a while to warm up and certainly woke work well until it's hot, but the Porterfields aren't like that. Why don't you take the wheels off, and pull out the front pads and have a good look at them, (left and right wheels) to see if they look glazed or scored or in any way generally weird. With regards to the disks, the one thing that no disk will like is being used very hard and then stopping the car very soon after. They need air-flow to cool them down a bit after hard use, and this is why people do cool-down laps on track days. I drove round and round for quite a while after my track day to cool the pads / disks as much as possible before parking up, cos red-hot disks will warp if you park up straightaway. This might also explain the discoloration. Is the pedal spongy at all ? If so, bleed the brakes. Is the pedal firm, but just doesn't slow the car as much as you like? This is a coefficient of friction issue betweent the pad and disk. Try fitting new Toyota pads, bed them in, to give you something to compare to. At a meet, try getting someone else to let you have a quick drive in their UK mkiv to see if the brakes feel any different. (Gav ?) I know that with you're reputation this will be as likely as a lottery jackpot but no harm in trying ............ :D If all else fails, I can recommend getting in touch with Darryl Payne (lives near Rugby) to be a general whiz with mkiv stuff, and a very helpful nice chap he is too. he's got all the gear in his garage and he'll take the calipers to bits and sort it all out and pretty much anything else, all for chicken-feed dosh. Link to comment Share on other sites More sharing options...
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