RXV Pedal-up Braking

bpalumbo

Hello everyone,
New member here so forgive me if I make any mistakes posting.
Recently I bought a used stock 2010 RXV from a private owner. Within a few weeks had what seemed to be the typical motor brake failure and this forum was extremely helpful in diagnosing so thank you for that. Old brake was obviously burnt up and new one has been installed. I also replaced the solenoid because it was only another $20. Cart is moving again but now coasts when you let off the accelerator. Before all this happened I only drove it a few times but remember that it stopped relatively quickly (without using the service brake). The manual refers to "Pedal-up Braking" and that regen braking should bring cart to a stop when moving and foot is off accelerator. I am not real familiar with my cart so I can't say what is normal for it. But I'm guessing something is still wrong. Is there some other problem that I need to fix that may have caused the motor brake failure to occur? I don't want to risk burning up the new brake. One thing to note: the brake went bad the first time I drove it after adding an oem state-of-charge meter. Meter plugged directly into factory wire harness but I will mention this in case it's possible I disturbed something else in the process.
Thanks in advance for any help you can offer.

BGW

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HiTechRedNeck

RXV's will coast to a stop then apply brake.

The "parking/Emergency" brake is only used to hold a stopped cart without using battery power or if brake is pressed very hard.(Panic stop)

the parking/emergency brake is "all or nothing" if functioning properly.

OEM state of charge meter is not in any way associated with brake.

If brake system was not functioning properly, cart diagnostics would not allow it to run.

(Maybe it would creep in limp home mode at 1mph)

Test again cart should gently slow (even down a hill) then stop then @3 seconds after stop ,lock parking brake.

Please post results!!

bpalumbo

Thanks for your quick response. I can definitely hear the parking brake click about 3 seconds after it rolls to a stop. Perhaps the fact that it stopped more abruptly prior to the motor brake failing was that the brake was already dragging? The service brake works excellent and also positively engages the parking brake if fully pressed as it should. What confused me most was the owner's manual's definition of "Pedal-up Braking" and the manual also states that "uncontrolled coasting does not occur with this model". Was not sure how far it should be allowed to coast as it was coming to a stop pretty quickly only by letting off the accelerator when I first brought it home - felt like letting off pedal was same as hitting the brakes. The previous owner claimed that was how it was intended to function. Was I mislead?

bpalumbo

I appreciate HiTecRedNeck's input, but is there an RXV owner out there who can confirm that coasting when you let off accelerator is normal on an RXV?

jdunmyer

OK, I just went out in the cold and tested my RXV:

It definitely has a bit of automatic braking when you lift off the accelerator pedal, but it's not much when on the flat. However, the location where I use it the most has some hills, and it REALLY has automatic braking on those. As in, it will actually come to a halt if I lift my foot completely off the pedal while going downhill. Actually, it will do the same while going UPhill.

I'm unsure of what you expect, I'm seeing an effect that's about like being in tall grass or kinda soft terrain, etc. It might have more of an "auto-brake" effect when the batteries aren't fully charged; my Nissan Leaf is like that, it has to be down to about 80% SOC to get full regenerative braking. I call that "one pedal driving", but you do have to use a bit of brake to come to a complete stop.

bpalumbo

Thanks for braving the cold for me. I don't have any hills near by so can't say much about that but on flat pavement mine seems to roll to a stop when it loses momentum. Can't say I feel any significant resistance slowing it down. Battery is fully charged if that has any affect on regen braking. Motor brake must have been dragging heavily before it failed. I just wanted to be sure its acting right cause I have the body off and a new replacement to put on so everything is easily accessible if it needs any additional work. I appreciate your help on this - think I'm going to carry on with the assumption that all is well...

Volt_Ampere

You need to try lifting going down a hill.

cgtech

The rxv does also have 4-5 built-in "profiles" that dictate its behavior. Like "costal", "hills", "airport". They all act a little different. Which profile is yours set on? Comparing red apples to green apples?

bpalumbo

Thanks for your input. I don't know what profile it is set to. Is it possible for it to change profiles without ever being connected to a handheld programmer? Behavior seems different after having motor brake replaced and battery cables changed. But no one has messed with the controller since I purchased this cart. Unless there's some way I could have made it revert to a default setting.

cgtech

Not gonna change the profile by working on the brake. Just saying that a comparison between like models can still yield different results. There is another significant variable to add: 2012 & prior rxv has Danaher controller, 2012.5 & newer have Curtis controller, so those two model versions are also not a great comparison. My impression is that the behavior you were experiencing was due to a failing brake, and operation is normal now.