Using brake hose for oil pressure sender relocation???

[VAGslag]

I'm fitting an oil pressure gauge to my b5 S4, and because of the size of the sensor I need to use a hose to locate it remotely...

Came across these ATE brake hoses online which is the right fitment:
https://www.cartech-one.co.uk/en/product/122279-br...

Can anyone think why I wouldn't want to use it for an oil pressure switch? Should be able to deal with the pressure and heat, right?

[GreenV8S]

Oil and brake fluid are chemically quite different. I wouldn't assume that hose is suitable for oil unless you see a spec sheet that says it is oil and petrol proof. If you know the end fittings, it's easy and cheap to get a length of oil hose and screw on end fittings, or go to your local hose supplier and get them crimped on.

[VAGslag]

Yea, that did cross my mind shortly after posting! . .

Thanks for your help, I've contacted a couple of hose makers today so hopefully they won't want too much £££!

[tapkaJohnD]

Have you considered a electric gauge, with a sensor in the engine compartment?
No need for a longer hose and no risk of messy leaks in the cockpit.

See: https://www.glowshiftdirect.com/oil-pressure-gauge... (No connection)
John

[DrDeAtH]

Either , electronic gauge sender, or a mechanical guage with a copper hardline, or braided teflon.

Pick one

[VAGslag]

I am using an electric gauge... But as said above - due to the size of the sender it will not bolt straight up as it will foul the oil filter housing. Hence the need to relocate the sender!

[dorset_clive]

I used an old flexi brake hose for exactly this on my rally car. Never had any problems but that particular car only lasted six months (sadly died when bravery out lasted skill!).

Notwithstanding the different chemical make up of brake fluid vs engine oil, brake hoses are (I assume) designed to be exposed to engine oil (at least the outside of them), and the engine oil pressure is likely to be well within the design spec for a brake system.

[GreenV8S]

dorset_clive said:

brake hoses are (I assume) designed to be exposed to engine oil (at least the outside of them)

Just because it is designed to be installed in the engine bay does not mean it is fuel or oil safe. Some hydraulic hoses have nitrile liners and are described as fuel/oil safe, but not all. If the manufacturer doesn't explicitly say that it is oil/fuel safe, it is not safe to assume the hose is suitable.

[PaulKemp]

Plenty of nitrile lined braided hose available that will be oil/fuel resistant.
Non oil/fuel resistant braided will become porous and you won’t see it until to late.

[DVandrews]

Caterhams often remotely mount the pressure senders as they are vulnerable when mounted directly, both the impact and vibration, they use braided brake hose for the remote mount kit with appropriate fitmnts.

Dave

[Mr2Mike]

DVandrews said:

Caterhams often remotely mount the pressure senders as they are vulnerable when mounted directly, both the impact and vibration, they use braided brake hose for the remote mount kit with appropriate fitmnts.

Dave

Aeroquip hose uses a PTFE liner, so quite suitable for oil.