Need help identifying lockheed master cylinder
 

Hi All,

After a couple of decades, it's time take my cobra out of mothballs. It was a kit purchased at a place called G & R Engineering in Sacramento. It was similar to the Arntz but without the bulges and additional length, I think. From what I remember the kit was also close to the Butler, and for a short time my cobra worked on by Bennett Cobra in Hayward.

Anyhoo, I got the thing running again and worked out a few kinks but found the brake master cylinders and clutch master cylinder leaking. So, either replace the master cylinders or rebuild them. Only trouble is that I don't have any part numbers. The pedal assembly was purchased from Bennett and the old receipts show no details other than "pedal assembly".

Let me describe the pedal assembly and I'm hoping someone here knows what I have:

Underfloor pedal assembly with (2) master cylinders and (1) clutch master cylinder. Front and rear brake m/c's activated through a balance bar. All m/c's have what appear to be older (english) Lockheed (tin can) reservoirs. The attached pic is not from my car but looks identical to the brake master cylinders. The clutch m/c also looks very similar to the pic with a few minor differences.

I have not taken out the m/c's yet and really don't want to do so until I get this sorted out. Or, maybe I need to remove them to see if they're stamped with part numbers?

Any help here will be greatly appreciated.

That's great to get it out of mothballs. The Girling with an integral master are readily available and if you have room for them I believe will bolt right on. You'll have to check bore sizes to match them up of course. A couple of suggestions on masters.
https://www.pegasusautoracing.com/pr...ampaign%3DBROI
Wilwood Aluminum Master Cylinders - Single Bowl Design - SummitRacing.com

Mick,

Thanks for the suggestions. This gives me a place to start. I'll measure the m/c's that I have and the pedal box to see if the Girling or Wilwood unit will fit. Measuring the bore size is easy enough but I was wondering about the stroke. I see stroke distance is in the spec of the m/c's you listed. How critical is it that the stroke of a new m/c and the original match?

Randy

I think they will be pretty consistent with each other. The bore size will pretty much decide the volume of fluid moved as the stroke will be the same or close. While you're looking at yours check the 2.25" hole center on mounting bolts.