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Elektrobank · Posted: Thu Mar 27, 2008 10:15 pm Post subject: 931 front calipers

hi all!!

i'm looking for some front calipers for my 1980 931

my car has 5 stud hubs, now the question is:

will fit some front calipers from a 1987 Porsche 944S ??
this car has also abs but this thing is not so much important...

here is the picture...

http://i203.photobucket.com/albums/aa296/elektrobank2/porchecaliper.jpg

please let me know, if this caliper will fit my car i'll put my car once again on the road

Thanks!

Gianluca
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924T Dta inj + sequential LPG
Cosworth
MotoMorini 501
Moto Morini 350 K2
lot of fun but always on foot....

9xx · Joined: 18 Jun 2006 Posts: 627 Location: Jarvenpaa, Finland

They should be the same. (Euro 931 vs. 944 S 2.5 16V front calipers)
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Mikko

All gone: 931 '82 Alpine White, original option "220" G31 with LSD + 3 x 944

Paul · Posted: Fri Mar 28, 2008 8:30 am Post subject:

I've heard that Volvo 4 puck calipers bolt right on....
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

crunchie 57 · Joined: 18 Mar 2004 Posts: 117 Location: Brisbane Australia

ideola · Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI

Is this just for the fronts, or do the Volvo rears bolt up as well?
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erstwhile owner of just about every 924 variant ever made

Joes924Racer · Posted: Fri May 14, 2010 1:11 am Post subject:

Nice setup Chrunchy ..Volvo cals... They have 2 pots per cal
nice ...Has anyone dealt with ealry caliper kits, Is it if you
buy the bottem dollar rebuild kit ..
you dont get a bore seal causeit looks like theres only 2 items
the other kits have 3 could it be the 3 rd part is a outer dust seal
hold down .
Ill find out in a week..4mybuild.

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1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
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Tas931 · Posted: Tue May 18, 2010 12:56 pm Post subject:

The back brakes are probably allready the same, Volvo back brakes got used on lots.

I just removed a set of these 4 piston Volvo callipers from a 264. From what i have read elsewhere you can block off one of the brake lines as they use the same channel. that way you don't need create a block that goes 1-2.

will find out in the next month i hope

RC · Joined: 25 Mar 2007 Posts: 2636 Location: Australia

Hey thanks Tas931 for digging up this thread. There`s nuggets of gold buried under tons of tailings and crap on this board. Thanks also crunchie 57 for taking the initial jump on this.

Started checking things out myself and there are heaps of different 4pot calipers used on various Volvos through years and across models. Different size pads too. No idea on differences in piston sizes yet but IMO really worth looking into that more.

The Volvo calipers appear to all be 2 piston units. Rock Auto catalog is a useful source of checking compatibility & interchange of parts. Some basic googling gave me these links on modding the calipers to a single line. Apparently the cylinders are linked by drilling 2 joining holes while one port is blocked.

http://www.bmsc.com.au/forums/rallying-technical/3366-converting-volvo-calipers.html

http://forum.osella.com.au/topic.asp?TOPIC_ID=1175

The Volvo dual braking system with these 2 port calipers was used for years up to ABS. No doubt this was a good effective system. The two front and one rear caliper are connected to each independent hydraulic circuit. Intend to investigate this further, along with piston sizes and proportioning. Perhaps our resident brake engineer here can offer more.

Keep us posted of your progress. Sure others besides me are also interested.

gegge · Joined: 27 Jul 2007 Posts: 1124 Location: Sweden

There were three different types of Volvo 240 brakes:

• Lucas-Girling, Disc thickness [mm] 22, Brakehose connections 2, Piston diameter [mm] 38 (The pictures does show a 4-pot caliper)

• ATE, Disc thickness [mm] 14.3, Piston diameter [mm] 36

• ATE, Disc thickness [mm] 24, Piston diameter [mm] 36

The disc was 263 mm and the thicker ones ventilated.
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Carl Fredrik Torkildsen

924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs

Tas931 · Posted: Tue May 25, 2010 9:01 am Post subject:

Here is a Pic of the standard Calliper Vs the Volvo

ideola · Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI

Brilliant!
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erstwhile owner of just about every 924 variant ever made

Tas931 · Posted: Tue May 25, 2010 11:30 am Post subject:

thought you might like to see that.

Once i finish putting my Turbo back together (pray i have the right size bearings) i reckon i will try drilling the calliper and blocking off one break line as opposed to getting a 1-2 block. If all goes well i will post pics.

ideola · Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI

What bearings are you looking for?
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erstwhile owner of just about every 924 variant ever made

gegge · Joined: 27 Jul 2007 Posts: 1124 Location: Sweden

Tas931: Any difference in weight between the two calipers?
_________________
Carl Fredrik Torkildsen

924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs

Tas931 · Posted: Wed May 26, 2010 9:19 am Post subject:

I will measure them up soon. Unfortunately it will be on a bathroom scale but it should show any huge differences.

I Cleaned up the rest of my turbo bits last night, while talking to the fella there i found out that he has drilled the volvo callipers before for his son. so i'll try and get some help from him and take pics.