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Brake disc question

Rallymech
Robert Gobright
Mod Moderator
Location: White Center Seattle
Join Date: 04/27/2008
Age: Possibly Wise
Posts: 1,292

Rally Car:
91 VW GTI 8V

Rallymech

Brake disc question
December 29, 2008 08:49PM

Registered: 04/27/2008
Posts: 1,292

What are your opinions on running slotted rotors on the front? Has anyone had problems with dirt or mud fouling the slots?

Thanks, Robert.

Robert.

"You are way too normal to be on Rally Anarchy." Eddie Fiorelli.

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john vanlandingham
John Vanlandingham
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Location: Ford Asylum, Sleezattle, WA
Join Date: 12/20/2005
Age: Fossilized
Posts: 14,152

Rally Car:
Saab 96 V4

john vanlandingham

Re: Brake disc question
December 29, 2008 09:46PM

Registered: 12/20/2005
Posts: 14,152

Rallymech Wrote:
-------------------------------------------------------
> What are your opinions on running slotted rotors
> on the front? Has anyone had problems with dirt
> or mud fouling the slots?
>
> Thanks, Robert.

Done right the slots should be a pathway for the pads to squeegee the muck outwards and away from the working surface.
Worked on bikes and we even slotted the shoes and even drilled the drumto let shit go somewhere other than imbed in the friction material.

John Vanlandingham
Sleezattle, WA, USA

Vive le Prole-le-ralliat

www.rallyrace.net/jvab
CALL +1 206 431-9696
Remember! Pacific Standard Time
is 3 hours behind Eastern Standard Time.

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Rallymech
Robert Gobright
Mod Moderator
Location: White Center Seattle
Join Date: 04/27/2008
Age: Possibly Wise
Posts: 1,292

Rally Car:
91 VW GTI 8V

Rallymech

Re: Brake disc question
December 30, 2008 10:17PM

Registered: 04/27/2008
Posts: 1,292

John, You wouldn't worry about rocks getting stuck in the slots and chewing up the pads?

Robert.

"You are way too normal to be on Rally Anarchy." Eddie Fiorelli.

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Jon Burke
Jon Burke
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Location: San Francisco, CA
Join Date: 01/03/2008
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Posts: 1,402

Rally Car:
Subaru w/<1000 crashes

Jon Burke

Re: Brake disc question
December 31, 2008 10:46AM

Registered: 01/03/2008
Posts: 1,402

"What ELSE floats on water?"

'Very smawl rohcks!'

Jon Burke - KI6LSW
Blog: http://psgrallywrx.blogspot.com/

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slidewayswrx
Patrick Darrow
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Location: Portland OR
Join Date: 12/30/2006
Age: Midlife Crisis
Posts: 379

Rally Car:
Swedish John Deere

slidewayswrx

Re: Brake disc question
December 31, 2008 07:15PM

Registered: 12/30/2006
Posts: 379

Build a bridge out of er!

Zap zap my ass...

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1fastben
Ben Hetland
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Location: Utah
Join Date: 09/12/2007
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None, right now

1fastben

Re: Brake disc question
January 01, 2009 11:35PM

Registered: 09/12/2007
Posts: 297

Burn 'er n-ewaiy!

Ben Hetland
1973 Volvo 142 project car (with some cone-smashing on dirt in it's future, however)

"No. Rally Racing is a back alley sport filled with jackals, headhunters and thugs!"
-Pops Racer (Speed Racer movie)

www.utahrallygroup.com

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derek
Derek Bottles
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Location: Lopez Island/ Seattle WA
Join Date: 12/20/2005
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Posts: 853

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Past: 323, RX2, GTI. Next up M3 ?

derek

Re: Brake disc question
January 03, 2009 02:48PM

Registered: 12/20/2005
Posts: 853

I ran slotted disk with no issues.

In the long run reality always wins.

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Rallymech
Robert Gobright
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Location: White Center Seattle
Join Date: 04/27/2008
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Posts: 1,292

Rally Car:
91 VW GTI 8V

Rallymech

Re: Brake disc question
January 03, 2009 05:01PM

Registered: 04/27/2008
Posts: 1,292

Thanks Derek. That is what I needed to hear.

Robert.

"You are way too normal to be on Rally Anarchy." Eddie Fiorelli.

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Lurch
Eric Burmeister
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Location: Michigan
Join Date: 02/14/2006
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Mazdaspeed3 and Mazda Protege

Lurch

Re: Brake disc question
January 04, 2009 12:06PM

Registered: 02/14/2006
Posts: 307

Circumstantial...

But I've cracked a total of 4 rotors in my rally career. 3 of them were on my VW and were slotted. They cracked right along the slots.

I use plain ol' cast iron vented rotors now.

Holes eat pads FAST in mud. Whiteman tried 'em once on his VW and they cracked from the holes, too. I even replaced the rear rotor on my KTM with a solid rotor for mud riding after eating a set of pads in one mud ride, and put my swiss cheese rotor on my motard wheel.

YMMV.

Lurch
Eric Burmeister
The west coast...of Michigan

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Rallymech
Robert Gobright
Mod Moderator
Location: White Center Seattle
Join Date: 04/27/2008
Age: Possibly Wise
Posts: 1,292

Rally Car:
91 VW GTI 8V

Rallymech

Re: Brake disc question
January 04, 2009 09:21PM

Registered: 04/27/2008
Posts: 1,292

Thanks Lurch. None of the other rally car that I have worked on have had drilled or slotted rotors. Either way I will have the rotors cryo treated.

Robert.

"You are way too normal to be on Rally Anarchy." Eddie Fiorelli.

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david amor
david amor
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Location: Stoney Creek Ontario
Join Date: 03/22/2006
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david amor

Re: Brake disc question
January 04, 2009 11:55PM

Registered: 03/22/2006
Posts: 458

Rallymech Wrote:
-------------------------------------------------------
> Thanks Lurch. None of the other rally car that I
> have worked on have had drilled or slotted rotors.
> Either way I will have the rotors cryo treated.

Unless you're getting a hell of a deal on cryo, I'd just use the money and get a second set of rotors.

Gone fishing

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Do It Sidewayz
Chris Martin
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Location: Toronto, Ontario
Join Date: 01/15/2006
Age: Midlife Crisis
Posts: 567

Rally Car:
E-85 powered Impreza

Do It Sidewayz

Re: Brake disc question
January 05, 2009 08:46AM

Registered: 01/15/2006
Posts: 567

david amor Wrote:

>
> Unless you're getting a hell of a deal on cryo,
> I'd just use the money and get a second set of
> rotors.
>

+1,000,000

it's not worth it....

serious pads are going to wear through rotors....

and most times that rotors crack in a rally application is because of them being SUPER hot, and getting rapidly cooled (rally applications).

I've rallied on straight out of the box Brembo replacement rotors, pricing is good, and i've had them last me through 2 sets of brake pads.