Brake master cylinder, which one ?

[lasselasse]

Hi al. IAM about to fix the brakes on my s2a 109 Diesel from 1971. I bought a new brake master cylinder, clutch cylinder and slave cylinder. Its looks like I've got another type?
The model I bought from
Paddock suppose to be OEM and called PMD350.


Can I use it or shall I order a new one ? Isn't that case which one should I buy?

[Rangieman]

The new brake master cylinder you have been given is for a SWB model and is not suitable for LWB.
What's in your other box? Is your supplied clutch cylinder identical?

[Craig T]

The part number on the TRW box is indeed for a SWB, 90569126G
https://www.paddockspares.com/90569126g-master-cylinder-s2-2a-trw-lucas.html

For the 109" I think you need 90569128
https://www.paddockspares.com/90569128r-lwb-later-s2a-3-brake-master-cylinder-non-servo.html

They don't seem to list a TRW "Genuine" equivalent for that.

Craig.

[Rangieman]

What I do when replacing hydraulics where high quality parts are unavailable, is buy the Britpart aftermarket master and slave cylinders and replace all of the seals with TRW branded repair kits. Then,  at least the important components are reliable.
The kits are be found online.

[Wittsend]

Does this help

[Serious Series]

I have some TRW part numbers associated with brake parts.