[928uk] Clutch master cylinder

[Jonathan Rackowe]

Hi Jon, you wrote about "the rebuild kit for the slave" cyl. Was that a
typo? Did you mean the master cylinder or slave cylinder?

Best regards
Jonathan

1991 928 GT Amethyst Metallic



On Mon, 20 Jan 2025, 9:06 am Ben Hodges, <benhodges1975 at gmail.com> wrote:

> Thanks Jon!
>
> On Mon, 20 Jan 2025 at 08:35, <jon928se at gmail.com> wrote:
>
>> I can't see what the difference is between LHD and RHD master cylinders,
>> the pressure line to the slave comes out of the end of the master (remote
>> from the pedal) on both and the LHD (928 part number, I have two waiting to
>> be fitted) has the supply (infamous blue hose) hose connection pointing to
>> the front of the car. From memory so does the RHD master supply connection.
>>
>> The only difference I know of is that the push rod connection to the
>> pedal is a ball joint on RHD cars (M8 thread ball joint readily available
>> from non Porsche sources John Speake used to sell them) and is a rose joint
>> type joint on LHD cars because the master lines up better with the pin (not
>> ball) on the pedal. I presume that the rose joint fitting isn’t M8. If this
>> assumption isn't correct this isn't a show stopper as you can reuse the
>> original pushrod.
>>
>> The rebuild kit for the slave is a complete bastard to fit (primarily the
>> pressure seal) and needs to be warmed up in boiling water to make the seal
>> flexible enough to stretch over the piston.
>>
>> Jon
>>
>>
>>
>> -----Original Message-----
>> From: 928uk <928uk-bounces at lists.928.org.uk> On Behalf Of Jonathan
>> Rackowe via 928uk
>> Sent: 20 January 2025 11:04
>> To: Ben Hodges <benhodges1975 at gmail.com>
>> Cc: Jonathan Rackowe <jonathanrackowe at gmail.com>; Mike Miller <
>> auskartdyno at gmail.com>; 928 Org <928uk at lists.928.org.uk>
>> Subject: Re: [928uk] Clutch master cylinder
>>
>> Hi Ben,
>>
>> Had you already considered new seals?
>>
>> Why do you need to replace the m/c?
>>
>> I would consider a sleeved rhd one nearer to stock than a lhd one with
>> weird hose routing and lengths.
>>
>> If you do replace your m/c please sell one of us the old one to
>> recondition.
>>
>> Have you tried Douglas Valley Breakers for a rhd m/c ?
>>
>> Best regards,
>> Jonathan
>>
>> 1991 928 GT Amethyst Metallic
>>
>>
>> On Sun, 19 Jan 2025, 11:10 pm Ben Hodges via 928uk, <
>> 928uk at lists.928.org.uk>
>> wrote:
>>
>> > Thanks Mike
>> >
>> > I’m converting my auto to a manual so want to keep things stock for
>> > now to minimise the variables!
>> >
>> > Discussing it with a mate earlier he remembered when he put a new one
>> > into his GT it came with two rods - one being longer than the other.
>> > I’m going to purchase the 928.xx LHD one and swap the rods over if it
>> > is a different length.
>> >
>> > Cheers
>> > Ben
>> >
>> > On Sun, 19 Jan 2025 at 20:50, Mike Miller <auskartdyno at gmail.com>
>> wrote:
>> >
>> > > I had mine stainless steel sleeved and reduces 1 size in diameter to
>> > > give quicker clutch action. Little adjustment on the assist spearing
>> > > and pedal effort quite acceptable even for an octanagerian.
>> > > Mike Miller Brisbane 82s 5 sod
>> > >
>> >
>>
>>