Hi
I’m soon to start putting my braking system together and although I have bought copper pipes and plated fittings, some of the bits the fittings are going into are much older.
The older parts have all been cleaned and painted but I want to know if there is any specific grease or such like I can or should use on the threads during assembly.
I would normally use copper grease on bolts but not certain this would be suitable for brake fittings. Maybe it’s a no no but then if you don’t ask.
Also, when I reassemble the master cylinder i’m thinking there should be the smallest amount of grease on the pin where it meets the piston? Again, experience / opinions please.
Just for additional info, I plan to use Dot 5 silicone fluid in case this has any effect on advice offered.
Thanks in advance good people
Regards
Steve
You shouldnt be using any grease on the fittings. If you have cleaned the threads up then the fitting should be fine.
If the threads will not clean up sufficently then you will need new ends but be careful as that is a minefield trying to get the right sizes!
> Hi
I’m soon to start putting my braking system together and although I have bought copper pipes and plated fittings, some of the bits the fittings are going into are much older.
The older parts have all been cleaned and painted but I want to know if there is any specific grease or such like I can or should use on the threads during assembly.
I would normally use copper grease on bolts but not certain this would be suitable for brake fittings. Maybe it’s a no no but then if you don’t ask.
Also, when I reassemble the master cylinder i’m thinking there should be the smallest amount of grease on the pin where it meets the piston? Again, experience / opinions please.
Just for additional info, I plan to use Dot 5 silicone fluid in case this has any effect on advice offered.
Thanks in advance good people
Regards
Steve
Thanks for the quick response.
All the parts will be new with the exception of the master cylinder and the pressure valve on the bulkhead.
Even though these parts have been cleaned & re painted I want to be able to protect the threaded areas against seizing in the future.
A link to an american site lead me to this on good old flea bay. http://cgi.ebay.co.uk/Castrol-Red-Rubber-G…=item5d2707943b Says it can be used during cylinder assembly.
Maybe a very light smear on the threads of the fittings?
Again, thanks in advance.
Steve
You can put the tiniest amount of copper grease on the threads only - if you wish - but make sure it doesn’t contact any of the brake fluid passages. I would advise against the silicone fluid - but it’s up to you. I also strongly advise against the ghastly brake pressure reducing valve (the taper nose thing) - far far better to get a proper pressure limiting valve, as used to be fitted to Minis. By all means mount this on the front bulkhead - it’s far more accessible there - and pipe it into the rear brake circuit - plug the extra hole with a bleed nipple. As already suggested - be very wary of the different threads on the brake system - some are m10x1 and some are 3/8" unf. They DO NOT match!
> You can put the tiniest amount of copper grease on the threads only - if you wish - but make sure it doesn’t contact any of the brake fluid passages. I would advise against the silicone fluid - but it’s up to you. I also strongly advise against the ghastly brake pressure reducing valve (the taper nose thing) - far far better to get a proper pressure limiting valve, as used to be fitted to Minis. By all means mount this on the front bulkhead - it’s far more accessible there - and pipe it into the rear brake circuit - plug the extra hole with a bleed nipple. As already suggested - be very wary of the different threads on the brake system - some are m10x1 and some are 3/8" unf. They DO NOT match!
Thanks bmcecosse.
I have both the metric and unf fittings so okay there. I have also thought about swapping to a different type of brake valve after comments on here but not sure at the moment.
I’m interested why not the silicone fluid? Apart from the cost it seems to tick all the boxes. Suited for cars not used regularly, doesn’t absorb water and won’t damage paintwork.
I would appreciate your (and others) view or experience.
Many thanks
Steve
