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+--- Thread: Hydraulic Brake Cylinders (/showthread.php?tid=3277)
RE: Hydraulic Brake Cylinders - Stuart Giles - 04-09-2019
X 2 for the grease gun trick.
Even if that doesn't work first time, pointing a welding torch at the cylinder whilst it's pressurised has always worked for me. just make sure that you're not in the firing line when the piston comes out like a 7/8" diameter steel bullet; I nearly collected a Darwin award from this when I was an apprentice -the piston ricocheted around the workshop for what seemed an age.
RE: Hydraulic Brake Cylinders - Alan - 05-09-2019
I can’t wait to try that. It reminds me of when, years ago, I used to be in charge of an experimental workshop. The guys made a gun out of steel tube, an ignition coil and welding gas. I had to stop them when we started to get bullet holes in the roller doors.
RE: Hydraulic Brake Cylinders - richard wyatt - 06-09-2019
I have had good results from stainless liners but [as usual] beware cowboys. Lined ones are resistant to seizure; other measures useful for cars left standing are a dehumidified garage and use of silicon brake fluid. Having said that,my next A7 build will have cables!.
RE: Hydraulic Brake Cylinders - Chris KC - 06-09-2019
Possibly Richard but the reasons not to use silicone brake fluid are legion. Just about the only thing it has going for it is flow at ultra-low temperature which is why the US military insist on using it. But it's been a while since I heard of anyone driving an Ulster at -40C...
RE: Hydraulic Brake Cylinders - Alan - 06-09-2019
Well, the grease gun shifted the seized pistons. The bores actually don’t look too bad. I might try them with new seals and see how I get on.
Chris, our mutual friend who says he knows a thing or two about brakes, reckons dot5 rather than silicone.
RE: Hydraulic Brake Cylinders - Chris KC - 06-09-2019
Alan, is that a trick question? DOT5 is silicone fluid...
Rather than repeat it all may I politely refer you to a few comments I wrote on brake fluid earlier in the year?
http://www.austinsevenfriends.co.uk/forum/showthread.php?tid=2196&page=4&highlight=Brake+fluid
RE: Hydraulic Brake Cylinders - Alan - 06-09-2019
No, it’s brain fade. I think I meant dot4
RE: Hydraulic Brake Cylinders - Chris KC - 06-09-2019
Brain fade beats brake fade!....possibly....
Yeah, DOT 4 - just remember to change it every couple of years.
RE: Hydraulic Brake Cylinders - sebring115 - 06-09-2019
But dot 5.1 is high performance std fluid for abs systems
RE: Hydraulic Brake Cylinders - Chris KC - 06-09-2019
Sebring, how does that relate to Austin Sevens with Morris Minor wheel cylinders?
edit: or are you confusing DOT 5 & DOT 5.1? They are entirely different (and incompatible) materials.