Dino
Well-known member
Does the Leaf have a vacuum pump for brake assist ?
Smidge204 said:My understanding is the Leaf is completely drive-by-wire, so there is no mechanical connection between any of the controls (steering, accelerator, brake, parking brake) and the actual mechanisms. So rather than a booster and master cylinder, it probably uses an electric hydraulic pump/ram of some kind.
garygid said:It applies the energy-wasting disc brakes BEFORE the Regen?
So, with a LONG Regen-Braking run you are (perhaps slowly) heating the brake pads to ... "very hot"?
Is that done so that the brake pads will already be touching (lightly) the brake rotors, ready for increased disc-braking pressure?
GroundLoop said:Wow, that would be a departure. I thought the US required direct mechanical steering and brakes on all cars. If this is the world's first steer-by-wire, well, I have think hard about whether I'm ready for that.
There's probably an electric brake pump that provides boost pressure, like a Prius.
Likewise, an electric steering pump for that overboosted steering feel.
Next time someone does a drive, try cranking the wheel over while the Leaf is off. I'd bet it feels pretty normal -- heavy, but mechanically connected.
wgs1912 said:From the video I watched at work it shows a "cooprative" brake system. It starts with mechanical brakes switches to regen then bake to mechanical brakes at final stop.
garygid said:Perhaps this brake dragging and the resulting heating is the reason that "frequent" brake-fluid flushings are specified in the LEAF maintenance manual?
wgs1912 said:garygid said:Perhaps this brake dragging and the resulting heating is the reason that "frequent" brake-fluid flushings are specified in the LEAF maintenance manual?
It is not going to drag the brakes through regen switches from 100% mech. to 100% regn back to 100% mech. With a variety of % inbetween each. The longer the time slowing I assume the longer it will stay in regen.
As far as brake fluid services it is for moisture and copper in the fluid not just heat. This site has some good info on brake fluid.
http://www.aa1car.com/library/bfluid.htm" onclick="window.open(this.href);return false;
EVDRIVER said:That is not the reason for more frequent changes over other cars, it is because of the design of the LEAF electronic brake system and the added stress to the fluid. THe system is not like a traditional system and that is why it requires more frequent changes. All systems are subject to the same environmental issues.
Yep, I get that quite often. I've learned NOT to creep ahead in those situations, but just sit still. Only completely releasing the brake seems to clear it, and since I'm stopped at a light, I can't do that.TEG said:...I am pulling up to a stop light, using the brakes to slow down gradually and get ready to come to a stop behind the car in front of me. As I am doing this, the cars in front bunch together a little more closely so I ease back off the pedal a bit to "roll" forward a bit more, then ease back on... But now it seems to "grab" and slows me down suddenly (but just from like 5mph to 1mph), so I back off the pedal again since I wasn't quite ready to stop... Now this time the brake pedal seems numb, and I have to push it a lot harder than before to finally come to a stop. ...
Volusiano said:When it comes time for brake service (fluid change, pad change, rotor turned, etc), I wonder if you can take the Leaf to any normal brake shop, or whether you should stick with Nissan dealerships for brake service.
Enter your email address to join: