Auto rolls back

[stevieg.]

Hi when stopped at junctions etc. wont hold, if on a slight hill tends to roll back.
Any ideas why, Could it be hydraulic pressure?

 

[Srdl]

I don't know whether it was on your car but all recent Mercs have a "Hold" function. Your handbook should have details.

Basically, you stop as normal and then you give the brake pedal another little prod. That should then bring up HOLD on your fascia display and, to move off, you just press the accelerator.

You may need to persevere with this as it is can be hard to achieve at first. Some say they have to press it harder, some just a gentle prod. It took me a couple of weeks to get the hang of it and it now work 9 times out of 10 with no problem.

 

[Plasmadaddy]

My new C class does the same thing. I use the HOLD function most of the time but its pretty disconcerting to have an automatic vehicle roll backwards on a hill if you forget!!

 

[drmw]

Hi when stopped at junctions etc. wont hold, if on a slight hill tends to roll back.
Any ideas why

at a guess, because you are not applying the brakes

 

[mikestrivens]

All mine have held on the torque convertor without rolling backwards. Perhaps this is another feature introduced by Mercedes to crash more cars thereby increasing sales.

 

[EmilysDad]

Depends surely on how steep the hill is as to whether it'll roll back. My car doesn't have HOLD but it does have hill start assist where by it holds the brakes on for 'a short time' after removing your foot from the brake pedal ie plenty enough time to get to the throttle.
I upset a mate that was criticising other drivers that kept their foot on the brake because it blinded others behind them. I pointed out that his SBC brakes also held the brake lights on

 

[davemercedes]

AFAIK there's no hold function on my C Estate (2007 S203) although I will have to try nudging the brake pedal as described. I've never seen 'HOLD' appear on the dash display. But as Mike Striven says above it holds fine purely on the torque converter with engine at normal tickover speed. tbh I can't recall it rolling back even on very steep hills.

 

[L John]

at a guess, because you are not applying the brakes

That would have been my guess too.
When removing a foot from the brake pedal the car wont go forward up the hill, is there a fault or do I have to press another pedal somewhere?
Not really automatic is it, if I have to press pedals and steer the bl**dy thing

 

[television]

The difference of just a can few per miles can make all the difference, it can make 25 more can make all the difference

 

[L John]

The difference of just a can few per miles can make all the difference, it can make 25 more can make all the difference

Great to see you active again Malcolm, not sure you posted on the right thread.
Take it easy but keep at it, you're a legend.

 

[television]

Great to see you active again Malcolm, not sure you posted on the right thread.
Take it easy but keep at it, you're a legend.

Very few drop back in reversion, some a wheel do with just a fuse of idle, something that cannot easily be changed

 

[LostKiwi]

Yes idle speed can make a big difference. Sadly as Malcolm says it's not easy to change.

 

[flowrider]

IME all autos will roll back on a hill unless you up the revs slightly or use HOLD.

 

[davemercedes]

That would ...
Not really automatic is it, if I have to press pedals and steer the bl**dy thing

Hmm...
They had one law suit in the US where a camper driver put his automatic on cruise and went to sit in the back...
- After the crash he sued, saying it didn't work properly!

 

[LostKiwi]

That would have been my guess too.
When removing a foot from the brake pedal the car wont go forward up the hill, is there a fault or do I have to press another pedal somewhere?
Not really automatic is it, if I have to press pedals and steer the bl**dy thing

You need an Uber...

 

[L John]

Hmm...
They had one law suit in the US where a camper driver put his automatic on cruise and went to sit in the back...
- After the crash he sued, saying it didn't work properly!

I've heard versions of that but none are likely to have any truth in reality.
http://www.snopes.com/autos/techno/cruise.asp

 

[kid-jensen]

Tickover too low?

 

[Steve@Avantgarde]

None of the 7G's have a TC lock up hold on incline. My rolls back as well.

 

[DavidR]

Not sure if it's relevant, but both 5G boxes I've had appear to have an automatic hold function, but only if they are in W mode, not in S. In W it will hold on the steepest hills (seems almost like a one-way clutch has been engaged), but in S, it will roll back on steeper hills.

Oddly, it appears to have the same in Reverse.. I've not tried it out too much, but in W it certainly appears to have a hill-hold function, exactly the same as when in D (but in the other direction of course!) Not tried S in reverse to see if it rolls back (forwards!) or not.

 

[Scoob]

Oddly, it appears to have the same in Reverse.. I've not tried it out too much, but in W it certainly appears to have a hill-hold function, exactly the same as when in D (but in the other direction of course!) Not tried S in reverse to see if it rolls back (forwards!) or not.

Mine certainly holds in reverse. Our driveway is steep and I always reverse park. If I come off the throttle while backing up, the car holds its self perfectly.

When going forwards it's a little different. I always use the "Hold" feature if I'm going to be stationary for any length of time, so at traffic lights or a junction. However, if I'm on an upward incline in slow-moving traffic, edging forward slowly and then come to a halt not using the brake, the car appears to hold by its self. If however I've come to a halt using the brake, then let off the brake it'll roll back. Note that this is only on minor inclines, not steep hills - I just automatically use "hold" in that situation.

Scoob.