Is there any rear caliper with e-brake & >38mm piston for 914/6GT ? |
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Is there any rear caliper with e-brake & >38mm piston for 914/6GT ? |
amallagh |
Mar 16 2019, 07:06 AM
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#21
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Member Group: Members Posts: 103 Joined: 4-September 06 From: Cheshire, England Member No.: 6,767 |
My 914/6GT is struggling a bit with brakes having uprated to a 2.8 twin plug with about 280bhp.
It currently has S calipers up front and some 914/6GT rears with Porterfield R4 pads. As well as heat the sticky track tyre set up could cope with more brake torque as well. (215/50r16 front and 245/45r16 rear). It is not a single use car - It is used on road as well as competitive rally and some trackdays. There are plenty of 911 uprate options for the front, but without changing to a 911 emergency brake on the rear, then I haven't been able to find something to balance things at the rear. The current set up is properly balanced and there is no point in uprating the front unless I can uprate the rear. I really don't want to mess about with the rear arms by fitting the 911 e-brake system unless I really have to. Is there any alternative rear caliper out there with a cable operated handbrake mechanism, with a >38mm piston like the original 914/6 calipers ? Anything from an Audi or VW for example that anyone knows will work in this application ? Something with a 42 mm piston (like the Carrera rears) or even slightly larger would be ideal. Or has anyone fitted larger discs to achieve a similar upgrade ? If I could uprate the rears, then I could fit some Boxster front calipers on 280mm Carrera discs or a Boxster caliper kit with larger 300mm discs which will still fit under my 16" wheels which I definitely want to keep. Am I wasting my time looking for an uprate option for the rears which still uses the 914/6 style cable operated handbrake in the calipers. The crucial things is not having to change everything over to a 911 style e-brake set up. Any advice/options very welcome. Regards Andrew |
mb911 |
Mar 17 2019, 07:55 AM
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#22
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914 Guru Group: Members Posts: 6,871 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest |
So the question remains at least for me is why couldn't you machine for a larger piston?
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Superhawk996 |
Mar 17 2019, 10:07 AM
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#23
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914 Guru Group: Members Posts: 5,881 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
So the question remains at least for me is why couldn't you machine for a larger piston? Previously did design and release engineering of brake systems for OEM automotive. Machining of a brake piston bore isn't as simple as you might think. Tolerances are critical or you get piston binding, sticking, etc. The seal groove geometry is even more critical. It is not a just simple recess to hold the piston seal. The shape of the groove has everything to do with piston roll back that you need to "pull" the piston back when the brakes are released. Too much rollback = very poor pedal feel Too little rollback = dragging brakes Not saying it can't be done. Just not as simple as it might seem. |
mb911 |
Mar 17 2019, 10:25 AM
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#24
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914 Guru Group: Members Posts: 6,871 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest |
So the question remains at least for me is why couldn't you machine for a larger piston? Previously did design and release engineering of brake systems for OEM automotive. Machining of a brake piston bore isn't as simple as you might think. Tolerances are critical or you get piston binding, sticking, etc. The seal groove geometry is even more critical. It is not a just simple recess to hold the piston seal. The shape of the groove has everything to do with piston roll back that you need to "pull" the piston back when the brakes are released. Too much rollback = very poor pedal feel Too little rollback = dragging brakes Not saying it can't be done. Just not as simple as it might seem. Gotcha. |
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