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Rear Brakes
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bass gt  



Joined: 02 Dec 2004
Posts: 971
Location: Johannesburg for now!!

PostPosted: Sat Jan 06, 2007 9:45 am    Post subject: Rear Brakes Reply with quote

Hi Guy's,

Another seemingly strange Q, but here goes!!.
Do any of you know the piston diameter of the 931 rear brakes??

Many Thanks,

Steve
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-nick  



Joined: 16 Nov 2002
Posts: 2699
Location: Cambridge, MA

PostPosted: Sat Jan 06, 2007 10:09 am    Post subject: Reply with quote

54mm front and 36mm rear. I think that's from the tech/spec book.
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15psi boost, MS-II, EDIS, 951 IC, custom intake, Ford 5.0L throttle body, Forge BOV, WB o2, G31 w/LSD, 964 wheels, 968 rear sway, Bilsteins, 200# Welt. springs. A laptop, and a partridge in a pear tree.
1991 964 C4 Cabriolet
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Smoothie  



Joined: 01 Jan 2003
Posts: 8030
Location: DE (the one near MD, PA, NJ)

PostPosted: Sat Jan 06, 2007 11:43 am    Post subject: Reply with quote

Yessir, the little book says 54mm-front, 36mm-rear for the 5-bolt, 4 wheel disc setup.
-And for the 4-bolt disc-front, drum-rear arrangement it's 48mm-front and 19.05mm-rear.
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"..it's made in Germany. You know the Germans always make good stuff."


'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox
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bass gt  



Joined: 02 Dec 2004
Posts: 971
Location: Johannesburg for now!!

PostPosted: Sat Jan 06, 2007 12:42 pm    Post subject: Reply with quote

Thanks guy's,

In case you are wondering, i am fitting a Tilton pedal box into the car, and need to calc what size master cylinders i will need.

Steve
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bass gt  



Joined: 02 Dec 2004
Posts: 971
Location: Johannesburg for now!!

PostPosted: Sun Jan 07, 2007 4:18 pm    Post subject: Reply with quote

Sorry,

Are the rears single piston, or one piston each side??

Thanks
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sequential  



Joined: 18 Nov 2005
Posts: 500
Location: BANNED

PostPosted: Sun Jan 07, 2007 4:24 pm    Post subject: Reply with quote

bass gt wrote:
Thanks guy's,

In case you are wondering, i am fitting a Tilton pedal box into the car, and need to calc what size master cylinders i will need.

Steve



NOT TO WORRY , YOU are going to purchase a few master cylinders, before you are happy, even after measuring everything 10 times ,
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bass gt  



Joined: 02 Dec 2004
Posts: 971
Location: Johannesburg for now!!

PostPosted: Sun Jan 07, 2007 4:44 pm    Post subject: Reply with quote

Hi Wayne,

Tilton reckon that if i give them the specs of the car, they can size it all up in one shot. Well thats the theory anyway. Will be nice to get rid of the servo assistance anyway...

Steve
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Raceboy  



Joined: 01 Mar 2004
Posts: 2321
Location: Estonia, Europe

PostPosted: Sun Jan 07, 2007 6:06 pm    Post subject: Reply with quote

If you need more piston diam. at the rears, you can use 4bolt front pistons with barrels, they fit.
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bass gt  



Joined: 02 Dec 2004
Posts: 971
Location: Johannesburg for now!!

PostPosted: Sun Jan 07, 2007 6:16 pm    Post subject: Reply with quote

Raceboy.

Do you mean the front calipers from a 4 lug car?
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Raceboy  



Joined: 01 Mar 2004
Posts: 2321
Location: Estonia, Europe

PostPosted: Sun Jan 07, 2007 8:24 pm    Post subject: Reply with quote

bass gt wrote:
Raceboy.

Do you mean the front calipers from a 4 lug car?


No, not complete calipers, because they have smaller space for pads+rotor (remember, vented rotor on 5lug vs solid on 4lug). Just the piston with the barrel or cylinder, whatever you call it.
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'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
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ic932  



Joined: 11 Feb 2005
Posts: 1104
Location: UK

PostPosted: Sun Jan 07, 2007 10:07 pm    Post subject: Reply with quote

if i remember correctly you are using willwood 4 pots up front? maybe 951 brembo's and 951 (86') rear discs would work well with the wilwood front calipers?

it just so happens i have brand new 951 discs and mint 968 4 pot brembo rear caliper's for sale ....hmmmm
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bass gt  



Joined: 02 Dec 2004
Posts: 971
Location: Johannesburg for now!!

PostPosted: Mon Jan 08, 2007 12:51 am    Post subject: Reply with quote

ic932 wrote:
if i remember correctly you are using willwood 4 pots up front? maybe 951 brembo's and 951 (86') rear discs would work well with the wilwood front calipers?

it just so happens i have brand new 951 discs and mint 968 4 pot brembo rear caliper's for sale ....hmmmm


Hmmm indeed . Drop me a pm with your thoughts......
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sequential  



Joined: 18 Nov 2005
Posts: 500
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PostPosted: Mon Jan 08, 2007 2:43 am    Post subject: Reply with quote

bass gt wrote:
Hi Wayne,

Tilton reckon that if i give them the specs of the car, they can size it all up in one shot. Well thats the theory anyway. Will be nice to get rid of the servo assistance anyway...

Steve
,


HELLO Steve,

Yeah they will be able give you a master based ,based on the information , but it is very rare to get it right in one shot. as pedal feel is dependant on your driving style...
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bass gt  



Joined: 02 Dec 2004
Posts: 971
Location: Johannesburg for now!!

PostPosted: Mon Jan 08, 2007 5:25 am    Post subject: Reply with quote

sequential wrote:
bass gt wrote:
Hi Wayne,

Tilton reckon that if i give them the specs of the car, they can size it all up in one shot. Well thats the theory anyway. Will be nice to get rid of the servo assistance anyway...

Steve
,


HELLO Steve,

Yeah they will be able give you a master based ,based on the information , but it is very rare to get it right in one shot. as pedal feel is dependant on your driving style...


That'll be crap then...
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sequential  



Joined: 18 Nov 2005
Posts: 500
Location: BANNED

PostPosted: Mon Jan 08, 2007 5:58 am    Post subject: Reply with quote

bass gt wrote:
sequential wrote:
bass gt wrote:
Hi Wayne,

Tilton reckon that if i give them the specs of the car, they can size it all up in one shot. Well thats the theory anyway. Will be nice to get rid of the servo assistance anyway...

Steve
,


HELLO Steve,

Yeah they will be able give you a master based ,based on the information , but it is very rare to get it right in one shot. as pedal feel is dependant on your driving style...


That'll be crap then...



Yeah,
Usually it takes 3 attempts at sizing for most to be happy with master cylinder feel and performance.
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