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[Andy B]

Question  :-/ :-/
When you bleed your brakes without the assistance of a diagnostic machine to trigger the pump, what percentage of the fluid do you actually change? Would any fluid in the pump just stay there, or would it move through the system to the bleed nipple? Just thinking out loud. 

[Lazydocker]

Question  :-/ :-/
When you bleed your brakes without the assistance of a diagnostic machine to trigger the pump, what percentage of the fluid do you actually change? Would any fluid in the pump just stay there, or would it move through the system to the bleed nipple? Just thinking out loud. 

When I had the pipe go and ran low on fluid I couldn't bleed the air out of the pump without plugging a machine in to operate it, even though there was no air coming through the system without it

[tunnie]

you should be able to flush the entire system, its very easy to drain the header tank, make sure you keep it topped up.

Think I used a considerable amount when I last did it properly

[Andy B]

Question  :-/ :-/
When you bleed your brakes without the assistance of a diagnostic machine to trigger the pump, what percentage of the fluid do you actually change? Would any fluid in the pump just stay there, or would it move through the system to the bleed nipple? Just thinking out loud. 

When I had the pipe go and ran low on fluid I couldn't bleed the air out of the pump without plugging a machine in to operate it, even though there was no air coming through the system without it

Thanks.
That would suggest that in normal operation then that fluid by-passes the pump on its way to the wheel. 

[Andy B]

you should be able to flush the entire system, its very easy to drain the header tank, make sure you keep it topped up.

Think I used a considerable amount when I last did it properly

That was the reason for my question. If as Lazy suggested, the fluid doesn't get to a wheel via the pump, you could bleed gallons through from the reservoir to the wheels & not touch that fluid in the pump. 

[Lazydocker]

you should be able to flush the entire system, its very easy to drain the header tank, make sure you keep it topped up.

Think I used a considerable amount when I last did it properly

That was the reason for my question. If as Lazy suggested, the fluid doesn't get to a wheel via the pump, you could bleed gallons through from the reservoir to the wheels & not touch that fluid in the pump. 

Yep, and when I operated the pump and pedal bled it I got plenty of air out from that one wheel

I used about 2 litres of new fluid in the end, although if you operated the pump from the start you'd probably get away with 1

I know I wanted to replace the fluid but it was a bit of an extreme way of doing it

[tunnie]

you should be able to flush the entire system, its very easy to drain the header tank, make sure you keep it topped up.

Think I used a considerable amount when I last did it properly

That was the reason for my question. If as Lazy suggested, the fluid doesn't get to a wheel via the pump, you could bleed gallons through from the reservoir to the wheels & not touch that fluid in the pump. 

I prefer the two person method, I got mother T to pump brake pedal when I did mine properly. Also means minimal effort on my part, just releasing the 8mm (or what ever it is) to release the brake fluid. 

Its worth clamping the feed pipe with some mole grips or something, and force the piston in, as that fluid often stays with a standard flush

[Andy B]

...
Yep, and when I operated the pump and pedal bled it I got plenty of air out from that one wheel .....

What did you use to operate the pump?




or shouldn't we ask?............... 

[Andy B]

....
Its worth clamping the feed pipe with some mole grips or something, and .....

you rough bugger! 

[Lazydocker]

...
Yep, and when I operated the pump and pedal bled it I got plenty of air out from that one wheel .....

What did you use to operate the pump?




or shouldn't we ask?............... 

"My Naff Code Reader"

[Lazydocker]

....
Its worth clamping the feed pipe with some mole grips or something, and .....

you rough bugger! 

Agreed... I'd prefer to use a proper pipe clamp

[Kevin Wood]

There will be stale fluid in the pump and accumulator inside the valve block but it will soon get diluted into the fresh fluid when you next use the ABS or TC.

Kevin

[Andy B]

There will be stale fluid in the pump and accumulator inside the valve block but it will soon get diluted into the fresh fluid when you next use the ABS or TC.

Kevin

That sounds reasonable.
I need to give the brakes of her Smart Roadster a coat of looking at, they're a bit soggy  :-/ :-/ :-/ - discs at front & drums at the back.