Series 1 brake plumbing

[dandlandyman]

A friend contacted me on the weekend looking for a junction piece (just after the master cylinder, splitting three ways towards the wheels) for his 88". I dated it for him a while ago, and found it to be one of the earliest 88s, 1956 or so, I can't recall clearly.

I have some Series 2 brake junctions about, but I was curious if the threads were the same as his. I know the later 2as are UNF threads, but were the S1 units BSF threads or something else? And can I raid S2s to help him out?

I do know that the brake light switches are different between the two models, but he said the later set up would suit him better.

Thanks in advance.

Dan.
69 2A 88" pet4 (with an identity crisis), 68 2B FC pet6 (dozing quietly), plus others.

[chazza]

I think you are correct about the thread types and his machine would have had BSF flare nuts.

Unless he is determined on authenticity a UNF union can be used with the appropriate flare nuts,

Cheers Charlie

[Scallops]

The brakes were the first thing I sorted on my 1956 86 inch. The threads are BSF, and mine uses 10 inch, single cylinder drums all around, which I think is also different to a S2. The 88's did first appear in 1956 so you are quite right - your friend has one of the first.

Having said that, I'm sure you could use a bit of a mix, unless, as Charles also points out, your friend is a rivet counter.

[Lotz-A-Landies]

Authenticity is one thing and practicality is another one. Most likely his BSF flare nuts are getting rounded by now and 3/16 BSF cylinders even more difficult to find.

Depending upon the condition of his entire brake system and what sort of restoration he is undertaking the pragmatic thing to do may well be to retrofit the entire system to the later 3/16 UNF fittings.

BTW the 88" used the same 10" brakes right through to (and including) SIII so shoes, backing plates, snail cams and to an extent drums are interchangeable with the S1 types. The only differences are the BSF/UNF threads we've discussed and the 16mm holes for the SIII wheel studs instead of the 9/16 BSF of the earlier models. You can even retrofit the 2 bolt SIIa CB master cylinder onto the 3 bolt S1 CB master cylinder by drilling a hole in the chassis outrigger. The kits inside are the same.

[numpty]

.

BTW the 88" used the same 10" brakes right through to (and including) SIII so shoes, backing plates, snail cams and to an extent drums are interchangeable with the S1 types. .

Exactly Diana.

I used a pair if S1 backing plates on a S11 to fix a problem of flogged holes for the snail cams.

[dandlandyman]

Thanks for all that! Just what I needed.

Linus is certainly no rivet-counter, he's just trying to get the old bus going so he can use it around his block, and maybe later (waaaay down the track) get it registered. At one point he even thought about re-powering it with a Hilux engine, but (hopefully) I've talked him out of it. It's just too original to butcher.

Thanks again.

Dan.
69 2A 88" pet4 (with an identity crisis), 68 2B FC pet6 (dozing quietly), plus others.