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Andy m635 
Newbie 
Joined: 11-June-2006 Location: Worthing Sussex Status: Offline Points: 3 |
 Topic: m635 brake upgrade (88 highline)Posted: 17-June-2006 at 17:08 |
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Hi front discs have warped again, any advice for upgrading,size or make etc,general road use only... thanks
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ian M635UK
Really Senior Member I 
Joined: 01-July-2004 Location: United Kingdom Status: Offline Points: 264 |
Posted: 17-June-2006 at 23:39 |
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Go to www.bigcoupe.com They have a technical section for brake upgrades Upgrading to 850 csi fronts with e34 m5/540 rears is the dogs dangleys as far as upgrades go but not cheap. I have redstuff pads all round and the front discs on my M635 have warped yet again. They appear to be very maginal. When working the standard M635 set up is actually pretty good. Ian
Edited by ian M635UK |
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sharkfan
Advanced Newbie
Joined: 15-April-2006 Status: Offline Points: 33 |
Posted: 18-June-2006 at 18:12 |
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Hi, the previous owner of my 1985 M635 upgraded JUST the front discs to the E34 540 discs - he said he'd sometimes suffered warped discs and read somewhere that the 540 discs suffered far less warping and will just bolt on to the M635 hubs. HTH Sharkfan |
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phb10186
Really Senior Member I
Joined: 18-April-2005 Location: North London Status: Offline Points: 331 |
Posted: 18-June-2006 at 18:31 |
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what about the rest of the brakes, i.e pads and calipers? do they remain unchanged despite a new type of disc?
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1985 635 CSI with Style 134's 1998 Z3 2.8i |
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knitandcrochet
Newbie
Joined: 10-April-2006 Location: north wales Status: Offline Points: 24 |
Posted: 18-June-2006 at 19:01 |
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sorry to invade the thread and be the simplton
asking dosey questions but is that a real common problem with m6 set up? the reason i ask is that my six has m6 discs and calipers but the discs are warped - i was going to get some black dimond discs and pads but now im thinking it might be worth spending extra to change setup rather than fork out all the time for new discs. |
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AndyS
Really Senior Member II 
The Last of the Few Joined: 21-August-2003 Location: 55 � North Status: Offline Points: 1365 |
Posted: 18-June-2006 at 21:49 |
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The problem is the thickness of the discs.
M6's have different calipers & discs to normal 635's (which also suffer from warping). It depends on how hard you drive but track days or a fast descent of the Stelvio Pass will wipe them out. The 850 discs/calipers are the biggest & thickest that will bolt straight on. Upgrading the rears helps keep the braking balance but you'll need a 750 master cylinder with new brake pipes to avoid an over long pedal travel. Munich Legends did have a mod that used a thicker disc which was machined down in diameter to fit. Friend of mine used them without problems on track days so they may be worth researching. |
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AndyS
Live each day as if it's your last - one day it will be. 
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sharkfan
Advanced Newbie
Joined: 15-April-2006 Status: Offline Points: 33 |
Posted: 19-June-2006 at 13:40 |
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The M635 has 300mm x 30mm discs and the 540 has 302mm x 28mm discs so they bolt straight on and use the M635 calipers and pads. The difference is in the thickness of the individual rotors and the vented vains - they must be just a better design in that way. I'm not saying it's the best upgrade; obviously there are upgrades to the whole system including the master cylinder that can make your 635 or M635 race-car sharp; but I'm quite a progressive driver and fairly heavy on the brakes and so far have had no problems with this set up. It's also a relatively easy and cheap setup if you're not flush enough enough for a full blown upgrade. This is a link to quite an authorative write up on M6/635 brake upgrades http://bigcoupe.com/phpBB2/viewtopic.php?t=2137&start=0 HTH Sharkfan |
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Check it out!
Really Senior Member I
Joined: 02-May-2004 Location: Bristol/ Glos Status: Offline Points: 373 |
Posted: 20-June-2006 at 12:34 |
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try hi-spec motorsport. they are in the "links" section of my site www.335itc.co.uk. i have their 360mm kit, 6 pot calipers on my 335i. They are pretty much the cheapest around, and a caliper overhaul kit is comparible to normal bmw. replacement discs are cheap as well. they do alot of options.
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www.335itc.co.uk
Its gonna be finished for summer!!! thats the plan!!! 
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ian M635UK
Really Senior Member I
Joined: 01-July-2004 Location: United Kingdom Status: Offline Points: 264 |
Posted: 20-June-2006 at 22:59 |
Interesting. Certainly cheaper than M635 discs I may give them a go. Describe how a progressive driver goes |
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Check it out!
Really Senior Member I
Joined: 02-May-2004 Location: Bristol/ Glos Status: Offline Points: 373 |
Posted: 20-June-2006 at 23:09 |
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with these dimensions and assuming these are 1 piece rotors they must weigh a massive amount. Granted the oe parts probably weigh near to that but does this effect the car at all, with such large unsprung weight?
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www.335itc.co.uk
Its gonna be finished for summer!!! thats the plan!!!
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m635 brake upgrade (88 highline)
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sharkfan wrote: