V8Pete Posted September 28, 2007 Share Posted September 28, 2007 That's what happened with the fronts originally eh Pete? The steering and pedal shuddered at highish speeds? Not sure if you're talking to me or retep or which care you're referring to Quote Link to comment Share on other sites More sharing options...
V8Pete Posted September 28, 2007 Share Posted September 28, 2007 i find it hard to belive the those discs woulda warped by now one i dea i just had is to jack up car and semi engage handbrake and see you you can feel noticble highs and lows ...you can fix them *if they are new* by getting a mech to profile them with a on car profiler thing if they are worn however you have to get new ones I've warped a set of discs with around 500k's on them just bedding in the new pads. Taiwanese CRAP from BNT. Callum There's some famous, reputable brake website whose name escapes me, that reckon warped discs are a myth. Quote Link to comment Share on other sites More sharing options...
V8Pete Posted September 28, 2007 Share Posted September 28, 2007 Found it: http://www.stoptech.com/tech_info/wp_wa ... disk.shtml Quote Link to comment Share on other sites More sharing options...
WDE_BDY Posted September 28, 2007 Share Posted September 28, 2007 DELETED Quote Link to comment Share on other sites More sharing options...
fuel Posted September 28, 2007 Share Posted September 28, 2007 The front rotors in question on retep's car are DBA standard series which I don't think are quite cheap rubbish - the rear rotors are OEM Mitsubishi which were machined probably about 5,000kms before I got them (I converted from drums to discs on the rear, swapped over master cylinder and brake proportioning valve too). Front pads are Bosch, not sure about rear pads. Quote Link to comment Share on other sites More sharing options...
V8Pete Posted September 28, 2007 Share Posted September 28, 2007 Yep, I've read that.Also had an up close look at the discs and that site can kiss my ass. Lol Quote Link to comment Share on other sites More sharing options...
peteretep Posted October 7, 2007 Author Share Posted October 7, 2007 So me and dave looked at this today, all the disks are within limits I replaced the rear pads of which one side was wearing at an angle note: after replacing pads, push in brake pedal before you tighten the handbrake!! otherwise the handbrake wont work! Brakes still throb though, dave thought it could be that the wheels arent balanced properly... any thoughts? Quote Link to comment Share on other sites More sharing options...
Unclejake Posted October 8, 2007 Share Posted October 8, 2007 So me and dave looked at this today, all the disks are within limitsI replaced the rear pads of which one side was wearing at an angle note: after replacing pads, push in brake pedal before you tighten the handbrake!! otherwise the handbrake wont work! Brakes still throb though, dave thought it could be that the wheels arent balanced properly... any thoughts? How did you check the rotors? If you just checked for thickness then that won't help. If you checked for run-out with a dial gauge then that would give you a better idea. I can't imagine unbalanced wheels only being a problem under brakes - and it certainly wouldn't give you pedal talk. You have a warped rotor or a rotor with a high spot on it. Quote Link to comment Share on other sites More sharing options...
peteretep Posted October 8, 2007 Author Share Posted October 8, 2007 we checked it with a dial gauge on both sides of the disk, nothing was more than 0.1mm out, i was under the impression that you could only feel it when it was more than ~0.17mm Quote Link to comment Share on other sites More sharing options...
Unclejake Posted October 8, 2007 Share Posted October 8, 2007 we checked it with a dial gauge on both sides of the disk, nothing was more than 0.1mm out, i was under the impression that you could only feel it when it was more than ~0.17mm Hmm. Sounds like you are doing everything right. I am at the limit of my knowledge and if it was me I guess I would get the rotors machined on the car - or take it to a knowledgeable brake guy Quote Link to comment Share on other sites More sharing options...
sentra Posted October 8, 2007 Share Posted October 8, 2007 it occured to me today thinking about that article above, we should check the thicknesses, the max face runout on the left? front disc was like .08? but if how i remember that article is correct, that would make it .16 thicker than the thinnest point. if it was "warped" as such it would only be .08, that guys pretty adiment there is no such thing so im slightly inclined to belieive him. have you got an external micrometer at yours? 1 Quote Link to comment Share on other sites More sharing options...
peteretep Posted October 8, 2007 Author Share Posted October 8, 2007 hmm, could be, and nah I dont Quote Link to comment Share on other sites More sharing options...
sentra Posted October 8, 2007 Share Posted October 8, 2007 will bring one home 4 weekend yo/ on another note whats the deal with the pads that are really unevenly worn? is that a common thing? the pad looks like the caliper floaty arrangement is 10 degrees out of square to the disc, but its not i apologise in advance for spamming up your thread 1 Quote Link to comment Share on other sites More sharing options...
fuel Posted October 9, 2007 Share Posted October 9, 2007 it's pretty normal with single piston floating caliper brake pads I'ld say - all the pads I've pulled out of similar setups have been the same. Quote Link to comment Share on other sites More sharing options...
V8Pete Posted October 9, 2007 Share Posted October 9, 2007 Did you see the pad and rotor changes at Bathurst? Faster than gassing up. Also 6-piston calipers with 3 different sized pistons. Quote Link to comment Share on other sites More sharing options...
Guest vvega Posted October 9, 2007 Share Posted October 9, 2007 do you know why that is ?? Quote Link to comment Share on other sites More sharing options...
thegreatestben Posted October 9, 2007 Share Posted October 9, 2007 something to do with pad thickness wasn't it? Quote Link to comment Share on other sites More sharing options...
filthy one Posted October 9, 2007 Share Posted October 9, 2007 i had this issue on my rear discs just last week found out it was a semi seized piston on the caliper not releasing the pad all the way back so it was pusshing on the inside of the disc all the time got fukn hot to Rebuilt now $300 later fukn expensive rx7 shit Quote Link to comment Share on other sites More sharing options...
peteretep Posted October 9, 2007 Author Share Posted October 9, 2007 I dont think the rear pistons are seized, maybe I'll take it into a brake guy and let him do it Quote Link to comment Share on other sites More sharing options...
Unclejake Posted October 9, 2007 Share Posted October 9, 2007 Did you see the pad and rotor changes at Bathurst? Faster than gassing up. Also 6-piston calipers with 3 different sized pistons. The different sizes are to provide a different pressure and clamping rate on the leading edge of the pad than the trailing edge. Quote Link to comment Share on other sites More sharing options...
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