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Pull during regenerative braking?

regenerative braking pull

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9 replies to this topic

#1 OFFLINE   oz10k

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Posted 26 February 2016 - 11:51 AM

I recently got a 2015 C-Max Hybrid with a bit over 14,000.  I soon noticed an intermittent pull to the right.  I drive the same route to/from work, so I have a feel for the road grade.

 

At first I only noticed the pull (always to the right) during low speed braking.  I'm still not sure 100% sure if it's only during regenerative braking.  When it pulls, the steering wheel can move as much as 10 - 20 degrees!

 

Then I also started to notice that if I'm coasting (at any speed) and go over a bump I'll frequently get a small pull.  I have not yet noticed it pulling during acceleration.

 

I took the car to the dealer for a Check Engine Light and asked them to look at it.  Their response was that hybrid braking causes a pull.  That doesn't sound right to me.

 

So, does your call pull during regenerative braking?  If so, how much?

 

Thanks,

Ron

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#2 OFFLINE   cwstnsko

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Posted 26 February 2016 - 01:40 PM

My C-Max does not pull under regenerative braking. One test would be to put the car in Neutral during braking to see if it pulls more, or less.  I don't believe there is any regen when in Neutral.  I use this sometimes to clear the rust from the rotors.


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#3 OFFLINE   Plus 3 Golfer

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Posted 26 February 2016 - 03:11 PM

Agree with cwstnsko - no regen in Neutral and no pulling during regen. The Neutral test might tell you something.

 

I assume the dealer scanned all modules for DTC as they did find a bad purge valve.  

 

I wonder if the Electronic Power Assist Steering is causing the pull - the fact that going over a bump apparently causes a small pull. The Power Steering Control Module is self monitoring for DTCs and likely doesn't light the CEL if there is an issue that triggers a DTC in the EPAS.   An input from the steering torque sensor (works by measuring the relative rotation between an input and output shaft which are connected by a torsion bar) and vehicle speed are used to determine the amount of steering assist and compensation for road pull that is applied to steering effort.   A slight jolt to the output shaft could perhaps cause a larger than anticipated compensation if the sensor is somewhat faulty.

 

IMO, if the problem persists, find another dealer and take the SA for a ride and show the SA the issue. 


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#4 OFFLINE   oz10k

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Posted 26 February 2016 - 03:59 PM

Plus 3 Golfer - thanks for the all knowledge!  I like the idea of asking the SA to for a ride.

 

cwstnsko - I hadn't thought about putting it in neutral, that's a very good idea.



#5 ONLINE   ptjones

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Posted 27 February 2016 - 02:08 PM

I have watched SOC for the HVB when in neutral with my ScanGaugeII, it only goes down, stepping on the brakes has no effect on SOC. ;)

 

Paul



#6 OFFLINE   livesmith

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Posted 01 March 2016 - 12:11 PM

I recently got a 2015 C-Max Hybrid with a bit over 14,000.  I soon noticed an intermittent pull to the right.  I drive the same route to/from work, so I have a feel for the road grade.

 

At first I only noticed the pull (always to the right) during low speed braking.  I'm still not sure 100% sure if it's only during regenerative braking.  When it pulls, the steering wheel can move as much as 10 - 20 degrees!

 

Then I also started to notice that if I'm coasting (at any speed) and go over a bump I'll frequently get a small pull.  I have not yet noticed it pulling during acceleration.

 

I took the car to the dealer for a Check Engine Light and asked them to look at it.  Their response was that hybrid braking causes a pull.  That doesn't sound right to me.

 

So, does your call pull during regenerative braking?  If so, how much?

 

Thanks,

Ron

 

I'm amazed at some of the crud these dealerships try to get away with.  That's completely false.  

 

Mine doesn't pull under any circumstances other than maybe accelerating to the point of slipping the tires.

 

Why would hybrid braking make it pull?  Pretty sure you wouldn't want to release a vehicle that pulled every time you slowed down or coasted...

 

 

I'd check tire pressures, brakes and suspension components.



#7 ONLINE   ptjones

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Posted 02 March 2016 - 09:15 AM

I wonder if the front right brake is working when it shouldn't? Compare the disks surfaces right and left to see if they look the same. ;)

 

Paul



#8 OFFLINE   RobMax

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Posted 27 March 2016 - 04:48 PM

No pulling during normal braking from any speed here. Hybrid cars, like any other non-hybrid cars, don't normally do that if there aren't any problems. Dealership tech or service writer is an idiot or liar for saying that. Take a look under the car and see if there's anything amiss. Check for a problem with the suspension, braking components, leaking fluid, unevenly worn tire on the side it pulls on, etc. 



#9 OFFLINE   WNY

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Posted 27 March 2016 - 04:54 PM

mine doesn't pull at all on re-gen braking.  Bad strut, hanging caliper, rusty rotors, low tire pressure, could be anything with that side that is pulling. 



#10 OFFLINE   Marc Smith

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Posted 29 March 2016 - 10:29 AM

A month later.  no follow up from the OP.  hopefully he's not going around in circles...


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