Front Master Cylinder Rebuild on Rear?

If I understand this, you are saying that the
seal is expanded slightly by having less space ( axially) on the piston , due to the wire you’ve wound around it?

Regarding DOT 5 fluid, my one experience of using it made me question whether it was a good thing or not. The circumstances were that I had fitted Goodridge stainless braided brake lines to my one year old Yamaha XS1100. I refilled the brake system with DOT 5 , replacing the factory fluid. After a week or so, the front master cylinder piston became ‘sticky’ in its bore, not returning fully after brake application. I guess the seal must have swollen under influence of the DOT 5.
Has anybody else experienced this?

Dont use that horrible corrosive DOT 4 or 5 crap, it eats your seals and your paintwork.

I have been using SILICON Brake Fluid in all my non ABS Bikes for years and years now and its great.
Its also non corrosive so it doesnt spoil any paint around your bleed nipples or if you spill it.

No disadvantages at all.................just advantages !

Pete F
UK

strate6 wrote: Dont use that horrible corrosive DOT 4 or 5 crap, it eats your seals and your paintwork.

I have been using SILICON Brake Fluid in all my non ABS Bikes for years and years now and its great.
Its also non corrosive so it doesnt spoil any paint around your bleed nipples or if you spill it.

No disadvantages at all.................just advantages !

Pete F
UK

Need some clarification Pete. Silicone brake fluid is Dot 5 (as near as I can tell) but you don't like Dot 4 or Dot 5? Maybe you meant to say Dot 3 and Dot 4?

KB

Silicon (DOT5) has LOTS of places it should not be used.

But it should perform well in the old street bikes. You want NO trace of old fluid before filling...

Just do your homework before you put it in anything else.

biltonjim wrote: After a week or so, the front master cylinder piston became ‘sticky’ in its bore, not returning fully after brake application. I guess the seal must have swollen under influence of the DOT 5.
Has anybody else experienced this?

DOT 5 will not swell your seals. Sounds like you didn't completely disassemble, clean and flush all components to ensure all traces of the the old brake fluid were gone before putting the DOT 5 in. Combining DOT 5 with any of the other types will create a gummy mess.

Kawboy wrote:

strate6 wrote: Dont use that horrible corrosive DOT 4 or 5 crap, it eats your seals and your paintwork.

I have been using SILICON Brake Fluid in all my non ABS Bikes for years and years now and its great.
Its also non corrosive so it doesnt spoil any paint around your bleed nipples or if you spill it.

No disadvantages at all.................just advantages !

Pete F
UK

Need some clarification Pete. Silicone brake fluid is Dot 5 (as near as I can tell) but you don't like Dot 4 or Dot 5? Maybe you meant to say Dot 3 and Dot 4?

KB

Should be: DOT 3, DOT 4, and DOT 5.1 (which is not the same as DOT 5)