[-]
Board Rules
Some simple board rules have been posted. I recommend that you read and follow them so that we can all enjoy this shared resource. Last updated on 3/14/11 Board Rules


Post Reply 
 
Thread Rating:
  • 0 Votes - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Cross Drilled Rear Rotors
Author Message
bgkast Offline
VGT-Intercooled
****


Posts: 325
Joined: Feb 2008
Location:
Post: #1
Cross Drilled Rear Rotors
I don't know what brand they are, but my 240D has cross drilled rear brake rotors. What should I make of this?


Attached File(s) Thumbnail(s)
   

1979 240D- 'Sporty 240', 313K miles - GT2260V turbo, 4 speed manual with shorty knob, Air/Water Aftercooler, Many other Mods.

1982 300SD - 232 K miles - 'Big Black'

1986 F-250 4x4 6.9 Diesel, 150K miles - No turbo kit......Yet!

http://www.kastdiesel.com OBK #13
04-05-2008 08:21 PM
Visit this user's website Find all posts by this user Quote this message in a reply
winmutt Offline
bitbanger
********


Posts: 2,752
Joined: Dec 2008
Location: Atlanta GA
Post: #2
Re: Cross Drilled Rear Rotors
On a W123? Pull them off and look for manufacturer info!

1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
OBK #42
04-06-2008 06:27 AM
Visit this user's website Find all posts by this user Quote this message in a reply
bgkast Offline
VGT-Intercooled
****


Posts: 325
Joined: Feb 2008
Location:
Post: #3
Re: Cross Drilled Rear Rotors
I will next time I have the wheel off.

1979 240D- 'Sporty 240', 313K miles - GT2260V turbo, 4 speed manual with shorty knob, Air/Water Aftercooler, Many other Mods.

1982 300SD - 232 K miles - 'Big Black'

1986 F-250 4x4 6.9 Diesel, 150K miles - No turbo kit......Yet!

http://www.kastdiesel.com OBK #13
04-06-2008 12:00 PM
Visit this user's website Find all posts by this user Quote this message in a reply
MTUPower Offline
sonic wagon man
***


Posts: 108
Joined: Feb 2008
Location: Wellington, FL and Long Beach, NY
Post: #4
Re: Cross Drilled Rear Rotors
any news? are they solid or vented?

1984 300TD Myna IP/underhood IC/altered boost/AAZ's-265's@150bar/w126genII brakes-wheels/vogtland springs/egt-boost gauges....and more to come.
05-30-2008 08:37 PM
Find all posts by this user Quote this message in a reply
bgkast Offline
VGT-Intercooled
****


Posts: 325
Joined: Feb 2008
Location:
Post: #5
Re: Cross Drilled Rear Rotors
I'm don't remember if they are vented or not. There are no markings on the face of the rotors though.

1979 240D- 'Sporty 240', 313K miles - GT2260V turbo, 4 speed manual with shorty knob, Air/Water Aftercooler, Many other Mods.

1982 300SD - 232 K miles - 'Big Black'

1986 F-250 4x4 6.9 Diesel, 150K miles - No turbo kit......Yet!

http://www.kastdiesel.com OBK #13
05-31-2008 07:34 PM
Visit this user's website Find all posts by this user Quote this message in a reply
EuroDriver Offline
Naturally-aspirated
*


Posts: 11
Joined: Sep 2008
Location:
Post: #6
Re: Cross Drilled Rear Rotors
Summit Racing <!-- w --><a class="postlink" href="http://www.summitracing.com">www.summitracing.com</a><!-- w --> carries cross drilled rotors for the back of a w123 but not the front. Check them out.
10-01-2008 01:03 PM
Find all posts by this user Quote this message in a reply
Telecommbrkr Offline
Soon to be mod'ing......
**


Posts: 97
Joined: Mar 2008
Location: Canada : 30mi North of Eureka MT
Post: #7
Re: Cross Drilled Rear Rotors
I have been coming across these on e-bay for a while:

<!-- m --><a class="postlink" href="http://cgi.ebay.com/ebaymotors/BENZ-300-W116-W126-85-87-Front-Drill-Slot-Brake-Rotors_W0QQitemZ320300441280QQcmdZViewItem?hash=item320300441280&_trkparms=72%3A727%7C39%3A1%7C65%3A12%7C240%3A1318&_trksid=p4506.c0.m245">http://cgi.ebay.com/ebaymotors/BENZ-300 ... 06.c0.m245</a><!-- m -->

And these:

<!-- m --><a class="postlink" href="http://cgi.ebay.com/ebaymotors/Mercedes-Benz-300SD-SDL-86-87-W116-W126-slot-F-R-rotors_W0QQitemZ140270111505QQcmdZViewItem?hash=item140270111505&_trkparms=72%3A727%7C39%3A1%7C65%3A12%7C240%3A1318&_trksid=p4506.c0.m245">http://cgi.ebay.com/ebaymotors/Mercedes ... 06.c0.m245</a><!-- m -->

Any comments on these guys and their products?

'Jurgen' - 1982 300sd cream paint with palimino MB tex interior. Now running with new cooling systemBig Grin.......discovered oil cooler has pinhole @#$%@Angry Nitrile gloves back on......

'Otto' - 1985 300sd anthracite? grey/silver? with grey leather interior. (heated front seats!!!!Cool ) Euro headlights

Mods are in the works...
10-01-2008 09:15 PM
Find all posts by this user Quote this message in a reply
ForcedInduction Offline
Banned


Posts: 3,630
Joined: Feb 2008
Location: Hell
Post: #8
Re: Cross Drilled Rear Rotors
Telecommbrkr Wrote:http://cgi.ebay.com/ebaymotors/BENZ-300-...06.c0.m245

I would doubt their quality/fit considering the W116 was out of production 5 years before 1985.
10-02-2008 05:26 AM
Find all posts by this user Quote this message in a reply
bgkast Offline
VGT-Intercooled
****


Posts: 325
Joined: Feb 2008
Location:
Post: #9
Re: Cross Drilled Rear Rotors
EuroDriver Wrote:Summit Racing <!-- m --><a class="postlink" href="http://www.summitracing.com">http://www.summitracing.com</a><!-- m --> carries cross drilled rotors for the back of a w123 but not the front. Check them out.


So they do: <!-- m --><a class="postlink" href="http://store.summitracing.com/partdetail.asp?autofilter=1&part=PWR%2DEBR%2D034L&N=700+4294925045+4294905361+4294899859+4294922533+115&autoview=sku">http://store.summitracing.com/partdetai ... toview=sku</a><!-- m -->

1979 240D- 'Sporty 240', 313K miles - GT2260V turbo, 4 speed manual with shorty knob, Air/Water Aftercooler, Many other Mods.

1982 300SD - 232 K miles - 'Big Black'

1986 F-250 4x4 6.9 Diesel, 150K miles - No turbo kit......Yet!

http://www.kastdiesel.com OBK #13
11-03-2008 06:34 PM
Visit this user's website Find all posts by this user Quote this message in a reply
garage Offline
Bush Taxi
*****


Posts: 850
Joined: Jul 2009
Location: San Bernardino, CA
Post: #10
RE: Cross Drilled Rear Rotors
Has anyone else ordered drilled/slotted rotors for the w123 of ebay?
It seems as if there is tons of them on there, both front and rears.
Its questionable because its ebay...but damn that would be sweet to have on all 4 corners, along with stainless brake lines.
10-01-2010 12:19 PM
Find all posts by this user Quote this message in a reply
Captain America Offline
Boostin' & Roostin'
*****


Posts: 1,910
Joined: Jun 2010
Location: Riverside, California USA
Post: #11
RE: Cross Drilled Rear Rotors
Word on the street is that cross drilled rotors wear the pads faster which is something thats not fun on a daily driven car...

1982 300D Turbo ... The Tank ... E-fans, Exhaust/Down pipe ends at Firewall, A/C delete, ALDA delete, Rack limiter delete
2009 Buell 1125CR ... 146 American Made horse power on two wheels
1972 GMC Sprint (El Camino) ... http://www.youtube.com/watch?v=G73Q8cSpEbs
1988 Jeep Cherokee XJ ... The offroad master, Detroit Lockers, 4" Lift, 32 x 11.50 BFG Mud Terrains, Cut front fenders, bastard leaf pack
10-01-2010 03:36 PM
Visit this user's website Find all posts by this user Quote this message in a reply
garage Offline
Bush Taxi
*****


Posts: 850
Joined: Jul 2009
Location: San Bernardino, CA
Post: #12
RE: Cross Drilled Rear Rotors
Like how much faster are we talking??
That makes sense..i guess i never thought about that.
10-01-2010 03:48 PM
Find all posts by this user Quote this message in a reply
Captain America Offline
Boostin' & Roostin'
*****


Posts: 1,910
Joined: Jun 2010
Location: Riverside, California USA
Post: #13
RE: Cross Drilled Rear Rotors
I have no idea, I've never run drilled or slotted rotors. But yeah they would act like a chease crater on the pads I guess...

1982 300D Turbo ... The Tank ... E-fans, Exhaust/Down pipe ends at Firewall, A/C delete, ALDA delete, Rack limiter delete
2009 Buell 1125CR ... 146 American Made horse power on two wheels
1972 GMC Sprint (El Camino) ... http://www.youtube.com/watch?v=G73Q8cSpEbs
1988 Jeep Cherokee XJ ... The offroad master, Detroit Lockers, 4" Lift, 32 x 11.50 BFG Mud Terrains, Cut front fenders, bastard leaf pack
10-01-2010 05:10 PM
Visit this user's website Find all posts by this user Quote this message in a reply
bmwpowere36m3 Offline
K26-2
*


Posts: 27
Joined: Sep 2009
Location: CT
Post: #14
RE: Cross Drilled Rear Rotors
Cross-drilled rotors are totally pointless for the most part... too many specifics to get into. Especially on a DD, they are unnecessary and second even if cheaper on eBay I wouldn't trust my brakes/life to cheap chinese rotors.

Cross-drilled rotors
* more expensive
* pads wear faster
* rotors tend to crack and last less
* questionably look better

'80 MB 300CD, "Beauty"

&

'98 BMW M3, The BEAST
10-01-2010 06:45 PM
Find all posts by this user Quote this message in a reply
garage Offline
Bush Taxi
*****


Posts: 850
Joined: Jul 2009
Location: San Bernardino, CA
Post: #15
RE: Cross Drilled Rear Rotors
Well that all makes sense.
That idea is out the window then i guess.
10-01-2010 06:47 PM
Find all posts by this user Quote this message in a reply
ForcedInduction Offline
Banned


Posts: 3,630
Joined: Feb 2008
Location: Hell
Post: #16
RE: Cross Drilled Rear Rotors
Vented rotors are far better. Drilling is for letting out the brake pad gasses, which only happens when the brakes get very hot. Unless you're multi-lap racing or dragging your brakes down the mountains I can't see any benefit.

In any case, diameter > holes/slots. The Big Brake upgrade using 1986+ W126 rotors/calipers has far better results if you have 15"+ wheels to put on it.
(This post was last modified: 10-02-2010 05:45 AM by ForcedInduction.)
10-02-2010 05:44 AM
Find all posts by this user Quote this message in a reply
garage Offline
Bush Taxi
*****


Posts: 850
Joined: Jul 2009
Location: San Bernardino, CA
Post: #17
RE: Cross Drilled Rear Rotors
(10-02-2010 05:44 AM)ForcedInduction Wrote:  Vented rotors are far better. Drilling is for letting out the brake pad gasses, which only happens when the brakes get very hot. Unless you're multi-lap racing or dragging your brakes down the mountains I can't see any benefit.

In any case, diameter > holes/slots. The Big Brake upgrade using 1986+ W126 rotors/calipers has far better results if you have 15"+ wheels to put on it.

Well two seperate times once in a w116 and most recently in my 240D, I was coming down from from a VERY twsity, switchback filled, steep road from the Mt. Baldy ski lifts near my house. The w116 i just noticed extreme brake fading, and in the 240 i thought my car was on fire the drivers side front brake was smoking so bad.
There was no dragging the brakes down the hill, i was in a low gear but the drive up and down really pushes these cars to there limits.

Im definetly gonna go with the 15inch rotors then. These can only be put on the front right?
The calipers mount right up with stock hardware?
10-02-2010 11:25 AM
Find all posts by this user Quote this message in a reply
ForcedInduction Offline
Banned


Posts: 3,630
Joined: Feb 2008
Location: Hell
Post: #18
RE: Cross Drilled Rear Rotors
(10-02-2010 11:25 AM)garage Wrote:  The calipers mount right up with stock hardware?

All you need are the rotors, calipers, backplates and 15" or larger wheels.
10-02-2010 12:17 PM
Find all posts by this user Quote this message in a reply
garage Offline
Bush Taxi
*****


Posts: 850
Joined: Jul 2009
Location: San Bernardino, CA
Post: #19
RE: Cross Drilled Rear Rotors
But this is only for the fronts right?

Isnt the breaking power somthing like 70%front/30%rear on these cars?
10-02-2010 01:22 PM
Find all posts by this user Quote this message in a reply
ForcedInduction Offline
Banned


Posts: 3,630
Joined: Feb 2008
Location: Hell
Post: #20
RE: Cross Drilled Rear Rotors
Yes, there are no known upgrades for the rears.
10-02-2010 10:49 PM
Find all posts by this user Quote this message in a reply
Captain America Offline
Boostin' & Roostin'
*****


Posts: 1,910
Joined: Jun 2010
Location: Riverside, California USA
Post: #21
RE: Cross Drilled Rear Rotors
The braking power is really great on these cars. I can lock all four wheels on dry asphalt. Its just the fade that it a problem... anyone tried some brake ducts for better/faster cooling?

1982 300D Turbo ... The Tank ... E-fans, Exhaust/Down pipe ends at Firewall, A/C delete, ALDA delete, Rack limiter delete
2009 Buell 1125CR ... 146 American Made horse power on two wheels
1972 GMC Sprint (El Camino) ... http://www.youtube.com/watch?v=G73Q8cSpEbs
1988 Jeep Cherokee XJ ... The offroad master, Detroit Lockers, 4" Lift, 32 x 11.50 BFG Mud Terrains, Cut front fenders, bastard leaf pack
10-02-2010 11:10 PM
Visit this user's website Find all posts by this user Quote this message in a reply
garage Offline
Bush Taxi
*****


Posts: 850
Joined: Jul 2009
Location: San Bernardino, CA
Post: #22
RE: Cross Drilled Rear Rotors
(10-02-2010 10:49 PM)ForcedInduction Wrote:  Yes, there are no known upgrades for the rears.

Well i mean ive seen drilled, slotted/vented, and slotted/drilled rotors for the rear.
I would be open to putting vented/slotted rotors on the rear while upgrading the fronts to 15inch.
10-02-2010 11:53 PM
Find all posts by this user Quote this message in a reply
jonbobshinigin Offline
Holset
****


Posts: 264
Joined: Oct 2009
Location: Ocala, FL
Post: #23
RE: Cross Drilled Rear Rotors
Some input on cross-drilled rotors: I put Zimmerman Cross drilled, and Akebono Euro brakes on my 1987 300TD 2 years/25k+ ago and the rotors hardly have a lip and the brake pads look new. My stopping power is plenty sufficient, though not quite as good as the later 124 dual piston calipers. I recently put Stainless Lines on the rear and that made it a bit more firm. If I brake hard however, I have noticed a bit of a shimmy near the end. Rear right caliper was replaced recently as well.

1987 300TDT - 185,000ish
>>275HP om603 Project Profile here<<
1981 300D N/A - 250,000 (Project Car)
10-06-2010 09:44 PM
Find all posts by this user Quote this message in a reply
Silberpfeil Offline
Slowly Sideways
**


Posts: 89
Joined: Aug 2010
Location: upstate NY (Oneonta)
Post: #24
RE: Cross Drilled Rear Rotors
Anybody try Pagid pads?

What kinds of pads do people like?

"Molly" Jan. '84 black/tan 300d 180k miles, two owner car
10-10-2010 12:12 PM
Find all posts by this user Quote this message in a reply
Post Reply 


Forum Jump:


User(s) browsing this thread: 1 Guest(s)