Vacuum Pipe Mounting Bracket Help

[caveman]

I’m trying to locate a couple of bulkhead mounting brackets (C24749) for the 2 servo vacuum pipes, (and single copper brake pipe), that don’t seem to be available in original form from the usual suppliers, and thought I’d reach out to the wider forum community for help in steering me in the right direction. Here’s a couple of images;



Also, I’d be grateful if someone can provide/confirm the following measurements for the centre of the captive threads in cm/mm;

[caveman]

Clamps now located.

[caveman]

Any takers with the measurements?

[Dr-G]

All the following is from my '64 4.2 Coupe (rhd):

Approx. 5" centre-to-centre, and approx 1.5" down from the middle of the bend radius in the inset bulkhead panel.

My pipes were zinc plated or galvanised steel (or some other silver coloured plating), not copper. One pipe at the vacuum tank side has a tee welded onto one end. IIRC the tee has a flexible vacuum hose attached that goes to the master cylinder diaphragm valve, the straight bit of the pipe has another flexible pipe that goes to the the vacumm tank non-return valve.

The other end of the pipes are strapped side-by-side underneath the diagonal tubular engine frame on the near side. Becasue the ends are partially hidden, It's very easy to get confused when connecting these pipes to the servo. If you get the pipes mixed up, the harder you apply the brakes, the harder the servo tries to un-apply them. Ask me how I know

I made my own clamps.You can see at the top of the elongated oval part (for the vacuum pipes) has a smaller secondary bulge in it, which is for the master cylinder to servo transfer pipe. This pipe is a bit larger diameter than the rest of the brake pipes.

Hope this helps.

[caveman]

Dr-G, many thanks for the measurements, I was losing hope that the forum couldn’t help so it’s much appreciated, particularly as the clamps arrived yesterday, so a job for the weekend.
My vacuum pipes are also zinc or galvanised but painted black, certainly not copper as in the photograph. I do have the copper brake pipe, you mention, that runs parallel with them so the clamps should work nicely.

[Dr-G]

Dr-G, many thanks for the measurements, I was losing hope that the forum couldn’t help so it’s much appreciated, particularly as the clamps arrived yesterday, so a job for the weekend.
My vacuum pipes are also zinc or galvanised but painted black, certainly not copper as in the photograph. I do have the copper brake pipe, you mention, that runs parallel with them so the clamps should work nicely.

No problem. Early 4.2 details can be hard to come by, especially regarding the bulkhead.

Does your gear lever have a leather gaiter with the 3.8 type riveted chrome retaining ring?

[caveman]

Gear lever gaitor is rubber and I have the ‘early’ 4.2 brake pipe routing/set-up.

[caveman]

[Dr-G]

Any idea why the front/rear circuit brake lines were swapped on later cars?

[caveman]

According to Factory Original Jaguar E Type, substantial changes were made to the braking system of open two seater and fhc models in Oct 1965, so that they used the same system as the new two plus two model. New brake and clutch master cylinders, pedal box, brake light switch reposition, new servo, and changes to the vacuum lines and hydraulic pipes.

Early 4.2 models also have the vacuum pipes on engine side of bulkhead as seen in the thread pictures above.

[Dr-G]

According to Factory Original Jaguar E Type, substantial changes were made to the braking system of open two seater and fhc models in Oct 1965, so that they used the same system as the new two plus two model. New brake and clutch master cylinders, pedal box, brake light switch reposition, new servo, and changes to the vacuum lines and hydraulic pipes.

I can't see any difference in early or late m/c or servo components, just calipers?

Early 4.2 models also have the vacuum pipes on engine side of bulkhead as seen in the thread pictures above.

I know - I confirmed the bracket hole centres for you yesterday

[caveman]