Car lurches forward while brakes are applied

Toyota say this is normal.
I have 2010 and have the same thing happening too but I'm not sure if it is just as Toyota say normal regenerative breaking when hitting a hole or bump.

 

I don't see how this rules out ABS. If the bump causes momentary loss of traction, ABS seems likely to get involved.

So far, this sounds like the common braking surge / lunge / lurch / dropout / pause experienced by many Prius drivers at low to moderate speeds during low to moderate braking, and hitting a bump or pothole or railroad track or metal cover.

It is the subject of many many threads and a significant amount of controversy here.

The version I frequently experienced in my 2010 seemed to happen during regenerative braking when some sort of braking upset triggered the ABS. But others have attributed it to ABS only, and some have pointed to similar examples in certain non-hybrids. The 2010s had a recall that significantly reduced the effect. Others have noted it in post-recall cars, but I haven't yet noticed it in my 2012. Some drivers were terrified of it over fear of losing braking in emergency situations, while others felt is was just a touch-and-feel issue, not a safety issue. I believed it occurred only during regenerative braking, not in hard braking situations that bypassed regen, so it didn't particularly bother me.

If you have more details that separate your particular experience from the events described in the many other threads, please post them here.

 

i have not noticed this in any of my 3 pri.

 

Yes, because toyota has no idea how to fix it, they call it normal...lol

 

The sequence is likely that you are in regenerative braking mode. The bump causes a loss of traction and the abs is activated. Since the regenerative braking can't be pulsed there is a switch over to friction braking that can be pulsed. The moment of the transition feels like no brakes.

If it happens push a bit harder on the brake to get the friction brake activated

 

Hi - this is what I call the "boomerang" thread

A lot about was discussed already - here you can read all possible explanations - I experience the same and I got used to it.

One more rant about the lunging brakes | PriusChat

Braking switch over potholes issue/non-issue update | PriusChat

brake surge again! | PriusChat

 

I consider it to be one of the quirks of this car and leave myself a bit longer braking distance. When it happens, it's no longer a surprise and I just keep applying braking pressure.

 

I could repeat it at will in my 2010 by braking over bumpy railroad tracks situated just before an intersection with a traffic light. This was and still is a daily scenario on my normal commute. My hybrids from other makes don't do it at all.

 

no issues here either.