Gravity brake fluid flush

[barryh]

If you have the time, what I like about gravity bleeding is that provided you keep the reservoir topped up there is zero chance of introducing air. In my experience it's vacuum bleeding that pulls air in around the bleed nipple threads. I've never had that problem with gravity.

Gravity bleeding has got a touch quicker since the advent of low viscosity fluids and I would always do it in warm weather too.

I admit I would use pressure bleeding if I had the kit but gravity bleeding is the same in principle just at a lower pressure that the head of fluid provides. I've found it works nicely on motorcycles which have much shorter brake lines and greater head height of fluid so the fluid flows faster.

 

[DCDG]

I admit I would use pressure bleeding if I had the kit but gravity bleeding is the same in principle just at a lower pressure that the head of fluid provides. I've found it works nicely on motorcycles which have much shorter brake lines and greater head height of fluid so the fluid flows faster.

I pressure bled in the past it worked out fine but still didn’t have the pedal feel I was looking for. One man bleeding with a final gravity bleed cured the famously soft rogue pedal feel wasn’t perfect but livable.

 

[Capt W]

The one-person methods are cool indeed, but my wife would feel neglected if she wasn't in the driver's seat hearing me yell "DOWN and "UP" for 15-20 minutes.

 

[DCDG]

The one-person methods are cool indeed, but my wife would feel neglected if she wasn't in the driver's seat hearing me yell "DOWN and "UP" for 15-20 minutes.

It’s a one person bleed I don’t rely on a pumper. I do it myself now, last pumper I had made my brake pedal and master develop a creaking groan by over pumping the pedal.

 

[oilboy123]

Yes I pull old fluid out of the reservour. Refill, then get a hose with a bottle on all 4 wheels. I crack the bleeders, and will push on the pedal a few times. But not too far on the pedal.
I will have to see if my newer scan tool can activate my ABS. But I would need to maybe just do one wheel at a time. With the hose securely to the bleed screw.

 

[Capt W]

last pumper I had made my brake pedal and master develop a creaking groan by over pumping the pedal

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