[Rovernet] Master Cylinder for 1970 3500P6b

Vern Klukas vern at inkspotco.com
Fri Jan 11 22:45:39 EST 2019

The difference in reaction piston (the small guy) diameter is one of the variables in servo boost ratio. Larger the reaction piston, higher the ratio

So the Jag master will give a different pedal feel over the Rover. This is actually a supply problem for the Girling 4cyl P6s, as it’s basically the only car that used the 4.25:1 ratio version of the 7” remote servo, and the highest you can now get is 3.00:1


> On Jan 11, 2019, at 7:11 PM, Steve Manwell via Rovernet <rovernet at rovernet.org> wrote:
> I have one of these on my 3500S and it seems to work OK. https://www.welshent.com/Jaguar-Brake-Master-Cylinder-P24162.aspx
> The only variation I know of on the Rover and Jaguar master cylinders of this type is that the very small piston and associated O-ring seal between the air valve and the hydraulic side is smaller on one of them.  I am not aware of any practical difference in operating function among them.
> I have had trouble with leaks from rebuilt units of this type after a couple years of service, even when they are sleeved in stainless, due to some combination of seal material and maybe wear in a plastic bushing that get reused.
> --Steve Manwell
> On 1/11/2019 9:54 PM, Jonathan Present via Rovernet wrote:
>> I am in dire need of a Master Cylinder for this vehicle
>> I hear there are two types, a Jaguar model that will work, and one made specifically for the Rover, I would prefer the latter
>> Would anyone happen to have a part number, and a business that would sell me one, U.S.A. preferred, but UK works
>> Is anyone aware of NOS (new old stock) parts available for this car?
>> Thank You,
>> JP
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inkspotco.com · 250 864 5619 · in at inkspotco.com

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