65 disc brake master cyl fittings

[deaks]

I put a new master and booster on my 65 and it has the larger 3/8 and 1/2 fittings. I made new pipes up for the master to prop valve but the larger 1/2" is not right, it's bottoming out and weeping a little. I need either a longer 1/2" fitting, or a 1/2" female adaptor to 3/8 male fitting on the pipe. Problem is, i'm struggling to get one. Can anyone suggest a source.
cheers Mick

[moozmoozmooz]

Replaced all my brake pipes and fittings, "Automec"
Best wishes.

[rider]

Rock Auto usually have kits with a ton of fittings available. Or Amazon.com. You'll need to search out what you want exactly but here is an example from Amazon, delivered duty paid for $17.

https://www.amazon.com/Muhize-15-Pie.../dp/B087H149M8

[deaks]

Lots of smaller sizes but no 1/2" They do a 1/2" male to 3/8 female but I can't find one, except abroad.

[alastairq]

Mustang Maniac may have what you need?

[richard]

Seems a strange problem but thinking laterally, if you have full thread engagement maybe you could mill the master cylinder boss down a little to allow the tube nut some more travel before hitting the hex.

[ALLAN R]

That does seem strange that it is bottoming out. My master cylinder has quite a few threads still exposed. Are you sure you have double flare ends on the pipes? You can also get longer and shorter pipe unions. I always buy the longer ones.

[deaks]

I bought some from mustang maniac but they didn't work, they seem to bottom out. it looks like this. https://www.ebay.com/itm/12117516918...Bk9SR4z5l_yOYQ

[ALLAN R]

They look short. Maybe this company can help you Brake Nut Unions Imperial Male & Female Variable quantities | eBay

[deaks]

Thanks for your replies, drove it today and I dont think it is leaking now but the brakes are still not very good, it's got a good solid pedal but doesn't feel like the servo is kicking in. I've got some new brake flexis I might try them, bleed the brakes and if that doesn't work maybe change the prop valve. Master and servo are new, I bench bled the master, I also had to drill the brake pedal 1" further down, the pushrod is offset, to make the angle less severe.

[deaks]

They look short. Maybe this company can help you Brake Nut Unions Imperial Male & Female Variable quantities | eBay

Just ordered the 1/2"-20 18mm long Thanks Alan, you're a wealth of knowledge.

[ALLAN R]

Thanks for your replies, drove it today and I dont think it is leaking now but the brakes are still not very good, it's got a good solid pedal but doesn't feel like the servo is kicking in. I've got some new brake flexis I might try them, bleed the brakes and if that doesn't work maybe change the prop valve. Master and servo are new, I bench bled the master, I also had to drill the brake pedal 1" further down, the pushrod is offset, to make the angle less severe.

I don't think it's the pipes if they are not leaking and the pedal is solid. It could be a servo problem, but if you have a 7" servo like the ones in the disc conversion kits, I feel these are a bit marginal. I fitted one to my car and I could feel the pedal getting harder without braking effort increasing. I ended up fitting a 9" servo from a later Mustang. By drilling the servo rod further down the pedal, you have also reduced the leverage and consequently force on the servo rod. There is a guy in the USA, Mustang Steve, who does a bolt in 9" servo conversion, it might be worth looking him up. The proportioning valve reduces brake pressure to the rear brakes to stop them locking, that's not your problem.

[deaks]

Powered generally has 4.5-5.0 ratio, man has 6.1, instructions gave me the measurement. I've been reading up online, got a few things to try, will report back with my findings, hopefully a cure.
Mick

[ALLAN R]

Powered generally has 4.5-5.0 ratio, man has 6.1, instructions gave me the measurement. I've been reading up online, got a few things to try, will report back with my findings, hopefully a cure.
Mick

When I fitted the 9" servo on my car I had to re-drill the pedal arm as the servo rod had an offset end to it, but for the std 7" servo it has a straight eye on it that pretty well matches the old single circuit master cylinder. You are correct in that the stock manual brake pedal is a 6:1 ratio and the servo assist pedal for the 9" servo is 4:1 ratio. The 9" servo gives a very modern feel to the brakes

[deaks]

I've ordered a vac pipe for intake to servo, there's no splits in it but I now know that vac pipe is different to fuel pipe. I tested the servo by pumping the pedal and holding it, switched the engine on and the pedal drops a little, so that seems fine. I put my vac gauge on the pipe from carb to servo, at tickover it read around 18-19 " vac and isn't dropping unless you rev it. My booster is 7".