Front Rotors
Moderators: GRNSHRK, ron, bfons
-
- Posts: 523
- Joined: Mon Oct 30, 2006 8:23 pm
- Location: San Mateo, CA just South of San Francisco
Front Rotors
Hope everyone is doing well.
Many shops sell cross-drilled & slotted rotors for different prices but not sure about the manufacturers.
Just curious for the folks that are using them, where did you buy your front rotors from?
Any experience from this place ?
https://brakeperformance.com/all-products.php
They’ve got a lifetime warranty on warping and cracking.
Thanks
Many shops sell cross-drilled & slotted rotors for different prices but not sure about the manufacturers.
Just curious for the folks that are using them, where did you buy your front rotors from?
Any experience from this place ?
https://brakeperformance.com/all-products.php
They’ve got a lifetime warranty on warping and cracking.
Thanks
Tommy
1989 635 CSI (Second owner since Jun 1995, driven daily and retired in 2013 with 295k to occasional driving)
2011 335D (Daily driver) with 103,550
1989 635 CSI (Second owner since Jun 1995, driven daily and retired in 2013 with 295k to occasional driving)
2011 335D (Daily driver) with 103,550
- 86_6series
- Platinum Member
- Posts: 1069
- Joined: Mon Apr 02, 2007 10:08 pm
- Location: West Nyack, NY
Re: Front Rotors
I track my 6 with the big brake upgrade. Several tech guys said better performance and longevity with solid vented.
Don't need drilled and slotted for more secure stopping.
However, if your doing it for looks--well that's another story.
Don't need drilled and slotted for more secure stopping.
However, if your doing it for looks--well that's another story.
86-635CSi
96-MB C220 SOLD
98-740i
71-Continental MK3
96-MB C220 SOLD
98-740i
71-Continental MK3
-
- Platinum Member
- Posts: 3312
- Joined: Thu Sep 28, 2006 9:28 pm
- Location: scottsdale, arizona
- Contact:
Re: Front Rotors
Todd Howerton who was in the custom brake caliper business once told me the same and that the drilled and slotted rotors ate brake pads quicker
81 Euro 635 M90 with motronic. Currently under a complete nut and bolt restoration. Pictures at
flickr.com/photos/bertsphotos.
flickr.com/photos/bertsphotos.
Re: Front Rotors
A lot of (tuner?) drilled and slotted rotors on the market are drilled and machined after casting, a cheaper method. The proper method is for the slots and holes to be cast into the rotor and then machine finished. Drilling and slotting them afterwards weakens the structure of the rotor and is unsafe. I have seen rotors explode at the track where the cheaper rotors were used.
There are advantages to drilled and slotted rotors, but only in extreme situations like racing applications and yes they are more aggressive on pad wear.
The rear brakes with J-hook rotors on my BMW e92 M3 GT4
There are advantages to drilled and slotted rotors, but only in extreme situations like racing applications and yes they are more aggressive on pad wear.
The rear brakes with J-hook rotors on my BMW e92 M3 GT4
- Attachments
-
- r900x600-C-431e88c9-226005 sml.jpg (62.96 KiB) Viewed 2735 times
Scott Collins
80 Euro 635csi Stratosblau/Parchment
80 Euro 635csi Stratosblau/Parchment
-
- Posts: 523
- Joined: Mon Oct 30, 2006 8:23 pm
- Location: San Mateo, CA just South of San Francisco
Re: Front Rotors
Thanks for the replies. I don't track my car and yes I am aware of quicker pad wear. As the great Ed Rather told me, they're like a cheese grater.
I've tried many solid rotors (M6, E32 and E34) and they seem to warp so I'm looking for something that would help with heat dissipation. So far the cross drilled has lasted longer than the solids. Any idea would be appreciated, thanks
I've tried many solid rotors (M6, E32 and E34) and they seem to warp so I'm looking for something that would help with heat dissipation. So far the cross drilled has lasted longer than the solids. Any idea would be appreciated, thanks
Tommy
1989 635 CSI (Second owner since Jun 1995, driven daily and retired in 2013 with 295k to occasional driving)
2011 335D (Daily driver) with 103,550
1989 635 CSI (Second owner since Jun 1995, driven daily and retired in 2013 with 295k to occasional driving)
2011 335D (Daily driver) with 103,550
Re: Front Rotors
HI Folks,
Drilled was used in yesteryear as brake pads were outgassing and could not make full contact with the rotor at racing temps! That is no longer the case as companies making brake pads have come a long way since. Slotting is there to "clean" the pads as you scrape the pads on the surface while braking. Brake rotors "warp" when they are one piece because they are one piece and can't take the heat in race conditions and have no way to flex.. The two piece rotors are best for racing and spirited driving. What is common in both street and racing is to have the rotors Cryogenically treated. They are 1. stress relieved from the formation process, 2. Increased fine ETA carbides for wear resistance 3. shed heat more quickly due to the refined grain structure that takes place at -315F. I know because I'm in the business and do it regularly for race teams and personal cars alike. We also treat many engine internal components for longevity and high performance output.
If anyone is interested in reading about the process: https://ctpcryogenics.com/services/tran ... on/brakes/
Drilled was used in yesteryear as brake pads were outgassing and could not make full contact with the rotor at racing temps! That is no longer the case as companies making brake pads have come a long way since. Slotting is there to "clean" the pads as you scrape the pads on the surface while braking. Brake rotors "warp" when they are one piece because they are one piece and can't take the heat in race conditions and have no way to flex.. The two piece rotors are best for racing and spirited driving. What is common in both street and racing is to have the rotors Cryogenically treated. They are 1. stress relieved from the formation process, 2. Increased fine ETA carbides for wear resistance 3. shed heat more quickly due to the refined grain structure that takes place at -315F. I know because I'm in the business and do it regularly for race teams and personal cars alike. We also treat many engine internal components for longevity and high performance output.
If anyone is interested in reading about the process: https://ctpcryogenics.com/services/tran ... on/brakes/
'84 M635csi
'86 Lotus esprit Turbo (sold)
'86 Lotus esprit Turbo (sold)
Re: Front Rotors
I helped a friend cross-drill a pair of rotors and the weight difference was noticeable.
For a street-driven car with 5-spoke wheels, I don't need larger, heavier brakes, and I like the cross-drilled look.
And being a e24, I don't see myself regularly abusing the brakes in normal driving.
For a street-driven car with 5-spoke wheels, I don't need larger, heavier brakes, and I like the cross-drilled look.
And being a e24, I don't see myself regularly abusing the brakes in normal driving.
BillW
1987 635csi
1987 535is
1985 528e
1972 2002tii
1968 VW Beetle convertible
1983 Mercedes 380sl
1997 318ti
1998 M3
1987 635csi
1987 535is
1985 528e
1972 2002tii
1968 VW Beetle convertible
1983 Mercedes 380sl
1997 318ti
1998 M3
Re: Front Rotors
I bought a set of these for the front of my E28. I have about 5K miles on them and they've been great, no complaints.
https://www.tirerack.com/brakes/brakes. ... cat=Rotors
https://www.tirerack.com/brakes/brakes. ... cat=Rotors
1985 635CSi
1987 535is
1965 Impala SS
1987 535is
1965 Impala SS
-
- Posts: 523
- Joined: Mon Oct 30, 2006 8:23 pm
- Location: San Mateo, CA just South of San Francisco
Re: Front Rotors
Thanks everyone for your comments. I think my likely choice is the e32/e34 drilled & slotted rotors from Stop Tech.
Curious, anyone have any experience with EBC dimpled & slotted rotors?
Curious, anyone have any experience with EBC dimpled & slotted rotors?
Tommy
1989 635 CSI (Second owner since Jun 1995, driven daily and retired in 2013 with 295k to occasional driving)
2011 335D (Daily driver) with 103,550
1989 635 CSI (Second owner since Jun 1995, driven daily and retired in 2013 with 295k to occasional driving)
2011 335D (Daily driver) with 103,550
Re: Front Rotors
I ran a set of ebc dimpled and slotted rotors with red stuff pads for a while in an attempt to improve things as the stock setup is pretty ordinary. They were ok, but nothing spectacular.
'85 635csi JPS (RA2-66)