Other Stuff > Misc / Open
DOT4 to DOT 5 Silicon
Lobo:
Thanks to all who have contributed here; I do of course use the internet, but tbh place greater trust on the folk I know here as the knowledges and experiences will be genuine. I’ll be sticking with DOT 4 mainly due lack of current interest in spending more time on my back under the car (changing seals etc) - I’ve done enough for now! If next year I get the urge to change all the seals DOT 5 Silicon may yet happen.
I’ve a box of syringes Nige, and due the rear slave cylinders having the bleed nipples BELOW the brake pipes figured I’d give it a try to fill the lines ‘in reverse’, ie syringing in fluid from the slaves, and syringing the excess out from the master. It’s only me avail for this, so might work out easier. We’ll see… no biggy if proves unsuccessful.
K2-K6:
You may have such a device already, I make a brake bleed pipe/valve as follows;- thick wall small rubber hose (motor factors supply) that fits tight onto bleed nipple, push a bolt tightly into opposite end to seal it, then put a slit in one wall about 20mm long and roughly the same distance from clearing bolt end.
This makes the cheapest, best sealing little one way valve I've used to bleed with. Just open nipple 1/4 turn with this already in place, then you can pump as many times as you want while watching the reservoir level to bleed any line through. It's tradition that you may catch the outflow in a raspberry jam jar as part of this function :) strawberry being far too posh ;D
Used on any numberr of complex brake systems, such as pumped six way anti lock type with various nooks and crannies. Works very simply to never alow air to go backwards, so particularly efficient and quick to do on your own. You just don't need any assistance. That one way valve will let you walk round to the furthest point to lock it off as is doesn't need any monitoring.
It's so good, that should you need to replace fluid at any time, then if you can reach the bleed nipple without jacking, it will take about 5 mins a wheel.
McCabe-Thiele (Ted):
--- Quote from: Lobo on January 21, 2023, 11:30:39 AM ---
I’ve a box of syringes Nige, and due the rear slave cylinders having the bleed nipples BELOW the brake pipes figured I’d give it a try to fill the lines ‘in reverse’, ie syringing in fluid from the slaves, and syringing the excess out from the master. It’s only me avail for this, so might work out easier. We’ll see… no biggy if proves unsuccessful.
--- End quote ---
I think you will find the fluid friction makes it extremely difficult if not impossible to enable brake fluid to be pushed out of a syringe via a disc or wheel cylinder all the way via any three way connectors to the master cylinder on a car.
I've done it on my 400 (with 300 ml syringe) but that's just a relatively short set of pipework to the master cylinder.
What does work is if you use a large syringe (after initial first bleed using the brake pedal) to create a vacuum to pull out residual air bubbles. Using a syringe on an empty brake system has not worked for me as you can draw air in past healthy wheel cylinder seals. I've used an Easi-bleed kit to pump it down from the top if the master cylinder is cap vented only.
The valved bleed hoses mentioned above are pretty good you can buy them ready made - the hose lasts for over a decade.
.https://www.ebay.co.uk/itm/255004087399?epid=1130461392&hash=item3b5f6d9467:g:pNQAAOSws29bxgdw&amdata=enc%3AAQAHAAAAoD2Q6XcZob5YH4SOkrp7PuZUmC9MBofJv9KCOeKKUR1IW9V1BOzJqJ0NbflWhPZri%2BbP3E3Rn%2Bv6%2FtiN4nzkbAbuQzz%2FsxFq9kRlF0boDc4N5ANr8yZa3%2FWVyA61ZumqTUzI0vi3uYY5kRQUO94NJ56LKn09JBvmWncy72xtycDVrjJVgqqAkXAVp98x51zgcONk7oymr1BuBhZ2ewSwtrQ%3D%7Ctkp%3ABk9SR7CZoNC6YQ
K2-K6:
I make them longer Ted so that you can have a standard issue jam jar standing on the floor rather than try to balance it on something ;D
McCabe-Thiele (Ted):
--- Quote from: K2-K6 on January 21, 2023, 04:09:21 PM ---I make them longer Ted so that you can have a standard issue jam jar standing on the floor rather than try to balance it on something ;D
--- End quote ---
I bought two pipes cut off the end stop & slit - joined with some Kunifer copper slightly angled brake pipe to get a similar outcome. 8) 8) 8)
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