Tyres, Brakes and Suspension » GS 911 Brake Bleeding

I used the GS 911 tool for the first time yesterday to bleed the brakes and while doing so I noticed the following.
While performing the ABS flush your instructed to apply the brake for 2 seconds 3 times over and during this action the front brake lever came back to the bar.
The brakes now feel fine it’s just that I can’t work out if this is a normal result for the brake to come fully back as I can’t see why it should just because pump is running.
I’ve only ever experienced ABS action on the road in a car under emergency conditions once in a Merc 180 when they applied automatically by radar detection of stationary object before I could hit brakes and once in Rocky Mountain’s in Nissan truck while braking to avoid a crashed car, both times the pedal had harsh vibration and was totally solid.
Hence my question I would just expect continuous vibration on brake lever and not for it to travel back to bars.

Any thoughts/ experiences?

Are you bleeding the brake lines or just purging the ABS pump? If you are bleeding, ie flushing out old fluid, I would expect the lever to come right back because fluid is being expelled from the system. If you are just cycling (purging) the ABS pump with the GS911 then why are you pulling the lever at all? Doesn’t the GS 911 do a purge of the pump without manual intervention?

Just following instructions from GS911, once bleeding has taken place you’re instructed to run pump via GS 911 information / instructions on lap top and pull lever 3 times for 2 seconds during run period.
You’re required to bleed brakes once more following ABS pump cycle so my assumption was the manufacturer wants old fluid cycled out of pump then bled out of brake system following cycle.

My question is with bleed valves shut why would lever come back to bars just because pump is running, hence going in to ramble regarding my only experience of ABS activated or perhaps in this particular mode the system is allowing the cycle of fluid through the system and an activation of the ABS valves to ensure serviceability?

Not a concern as brakes are bled and lever maintains pressure no matter how hard you squeeze and for how long, thought it could be of interest to others if any other people having used GS911 to bleed brakes have noticed similar effects.

Yes I had exactly the same result. As you say, it's a bit odd. Fluid is presumably allowed to flow with valves open simultaneously. It works.

P

Nice one thanks, I just have to understand things and it bugs the life out of me if not as expected.👍