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Join Date: Mar 2007
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Move front brakes to rear

Hi Guys

I have a 930 Turbo and have modified the front brakes with 964 ones.

I would like to know if i can move the existing front brakes that have been taken off to the rear. Are there any modifictaions for this.

Can somebody advise

Thanks

Adrian
Old 01-15-2008, 07:01 AM
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It's a straight bolt on, but you need to swap the right front to the left rear, etc. Also, you need to swap out the bleeder screws and crossover lines on each caliper. You can't bleed the brakes with the bleeder at the bottom!
Old 01-15-2008, 10:45 AM
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interesting, which rear rotors will fit this application?
Bill K
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Old 01-15-2008, 11:50 AM
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I think the stock ones are used.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
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Old 01-15-2008, 01:22 PM
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why would you want to ?they are the same size pad
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Old 01-15-2008, 02:12 PM
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This is dangerous stuff you are trying, because the piston sizes of the calipers Front and rear are drastically different sizes. You may now create a situation where you will lock up the rear brakes under heavy braking and spin. The caliper's piston diameters are sized to automatically bias braking pad forces and operate as a matched set front and rear, even though the pads are the same size. Once you start swapping around calipers this force balance is destroyed. Your car does not have a bias proportioning valve so this is how Porsche controls the braking force balance in the early cars.
Just be careful, and look into this more before you get into trouble and possibly wreck the car.
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Old 01-15-2008, 02:25 PM
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cool swap that`s been done a lot when putting the newer bigger calipers up front.As long as the new front calipers are bigger then the rears by the correct percentage you`ll be fine. You can add a brake bias valve to tune if needed but you`ll know if it`s close the first time you hit the track. l`d try some panic stops in a safe area while you test the system.
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Old 01-15-2008, 05:20 PM
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Brake replacement

Quote:
Originally Posted by A930Rocket View Post
It's a straight bolt on, but you need to swap the right front to the left rear, etc. Also, you need to swap out the bleeder screws and crossover lines on each caliper. You can't bleed the brakes with the bleeder at the bottom!
Ta for the info

Regards

Adrian
Old 01-15-2008, 10:14 PM
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This has been done on my car and it does handle fine. I agree that you should test yours when you have done the swap though, that was good advice.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 01-16-2008, 12:10 PM
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Hi

Could you advise on the topic front calipers to rear. Can i use the existing rotors on the back of the vehicle. I am a bit concerned that they are smaller than the front and that the pistons in the caliper might move to far out thus creating a leak of brake fluid.

Thanks

Adrian
Old 01-17-2008, 10:57 PM
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The rear rotors work fine. You can make some metal spacers to make up the difference.

Quote:
Originally Posted by ady930 View Post
Hi

Could you advise on the topic front calipers to rear. Can i use the existing rotors on the back of the vehicle. I am a bit concerned that they are smaller than the front and that the pistons in the caliper might move to far out thus creating a leak of brake fluid.

Thanks

Adrian
Old 01-21-2008, 07:02 PM
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adrian
if concerned about the rotor thickness you can do as I did
use the outer peices from the front calipers and the inner peices from the rears
this way the only thing that changes is piston size
john
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Old 01-22-2008, 12:34 PM
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