Brake master cylinder

Post by **tortron** » Sun Apr 27, 2008 1:17 am

i just read that there was an early and a later version of the master cylinder. Is this true?
If so how can i tell the difference, i.e. part numbers.

thanks

Post by **Onne** » Sun Apr 27, 2008 11:09 am

Yes, two sizes (difference is in bore size) early cars (7" drums all round) had the larger bore, later 8" braked cars had the smaller bore.

Post by **tortron** » Sun Apr 27, 2008 11:58 am

is there any way to tell the difference from the outside? without having another to compare with

Post by **Rasputin** » Sun Apr 27, 2008 12:31 pm

The earlier ones had 13/16 stamped into them ,and the later ones7/8

Post by **tortron** » Sun Apr 27, 2008 2:04 pm

ha, so simple

Post by **moggs222** » Sun Apr 27, 2008 2:14 pm

I thought it was the early master cylinder that was 7/8" and the later one that was 13/16", best check.
moggs222

Post by **tortron** » Mon Apr 28, 2008 7:21 am

any confirmation on this?

Post by **Kevin** » Mon Apr 28, 2008 10:03 am

From a spares website

Brake Master Cylinder 13/16" Bore (Genuine Lockheed) RECOMMENDED The 7/8" Bore Master Cylinder fitted to Pre 1962 Models is no longer available. The 13/16" can be used as a replacement for Pre 1962 models.

Post by **Rasputin** » Mon Apr 28, 2008 11:07 am

Apologies if I got it wrong,but I got the info from Minor Matters technical tips

Post by **moggs222** » Mon Apr 28, 2008 7:20 pm

I had a look at the master cylinders on the shelf at my workshop and have got the following information that may be of help.

Early Lockheed 7/8" Master Cylinder Part Number LM18702

Late Lockheed/Delphi 13/16" Master Cylinder Part Number LM15453

Currently the late 13/16" Master Cylinder is manufactured by Caparo-AP Braking and their Part Number is 4225-453 PT3P and is available from most specialists.

I think MGM Spares who advertise in the club magazine have recently had the early master cylinder made but I suggest ringing them to check.

Hope this helps, regards Moggs222