Uneven braking

[Lean L]

Hi all,

I'm experiencing a weird phenomenon with an 09 accord v6. I am used to driving cars where you can manually time the braking so that you slide to an even stop every time. With this car even if I step on the brakes gently and keep the same pressure on my foot, there will be a time when the car suddenly jerks back a bit as if I just stepped on the brakes much harder.

What is the problem? Is it downshifting? Is it abs? Is the ECU doing something weird?

Thanks, I really prefer to brake at my command instead of whatever this is.

 

[SSSnail]

How long have you been driving the car? Which car did you drive before this? Did you change anything lately with regards to brake components?

 

[Zenmervolt]

Most likely it's just the automatic transmission downshifting, but that shouldn't be a "jerk" sort of feeling so I'm left with the impression that one of two things is going on:

1) You're vastly overstating the amount change that's actually occurring, or
2) Something's off with the transmission

It's not ABS (you'd feel the brake pedal pulse if it were, and, in any case, ABS will never cause braking to be harder).

ZV

 

[LTC8K6]

If you brake with the trans in neutral, does it still do it?

 

[Lean L]

How long have you been driving the car? Which car did you drive before this? Did you change anything lately with regards to brake components?

I had a 2000 toyota with no abs and no features at all. I have not touched the brakes on this car.

Most likely it's just the automatic transmission downshifting, but that shouldn't be a "jerk" sort of feeling so I'm left with the impression that one of two things is going on:

1) You're vastly overstating the amount change that's actually occurring, or
2) Something's off with the transmission

It's not ABS (you'd feel the brake pedal pulse if it were, and, in any case, ABS will never cause braking to be harder).

ZV

Could make sense that it's just the transmission. I'm really starting to not like honda transmissions especially with vcm...

If you brake with the trans in neutral, does it still do it?

I will have to try that to find out.

 

[SSSnail]

No, what I meant is how long have you been driving the car, and the reasons I ask is because if you're not used to the brake feel of the Honda, it can be jerky and grabby. Happens to me when I drive my Honda after driving another car for so long. Takes a bit to get a feel for the brake pedal and properly modulate my right foot so that it doesn't grab when I'm just stopping at a stop sign.

 

[phucheneh]

I just don't even get the original post...who rolls up to a stop with constant pressure on the brake pedal? I've always lightened up momentarily before a stop to avoid that awkward ass-bounce that some people seem to do. I've never driven a car that didn't require this basic bit of 'finesse' unless the brake pads were all glazed up or there was a hydraulic problem (i.e. I'm fighting just to actually make the stop).

 

[ino uno soweno]

Hi all,

I'm experiencing a weird phenomenon with an 09 accord v6. I am used to driving cars where you can manually time the braking so that you slide to an even stop every time. With this car even if I step on the brakes gently and keep the same pressure on my foot, there will be a time when the car suddenly jerks back a bit as if I just stepped on the brakes much harder.

What is the problem? Is it downshifting? Is it abs? Is the ECU doing something weird?

Thanks, I really prefer to brake at my command instead of whatever this is.

[FONT=&quot]I hear you, and ask you,

Is this prob going to fully brake and cause you to a have a serious braking accident,

Or could the box be getting ready to lock up,???. at speed, causing an accident,

Too scary for me, and I would not risk others, I would not drive the car especially with anyone else in it, , listen what everyone says, and if that is not quick enough for you to get the solution, i would go and get brake and gearbox checks, cheap as possible, asap.

Here, where I am, we have a country wide aftermarket competition suspension and brakes company, if they think you are going to buy their product they will do a 27 point safety brake and suspension check on a big computerized machine, for free, then hand you quotes for brake and suspension upgrades,


Also while it was standing I would check oil levels, brakes and box, get under it and check rubber mounts have not recently worn out, could be the reason for the bump sensation,

I hope it is not the gearbox too expensive, just a rubber mount would be a good,[/FONT]

 

[Demo24]

My moms 04 does the same thing, and even after driving it since new I still can't get use to it. Really really hate the way the brakes work in that car. Pretty damn strong, but its also really hard to gently modulate them.

Also had a lot of issues with the stock Honda rotors 'warping', and pad squeel. Eventually just replaced them both with better aftermarket parts and its been great since. Still grabby though.

 

[Lean L]

No, what I meant is how long have you been driving the car, and the reasons I ask is because if you're not used to the brake feel of the Honda, it can be jerky and grabby. Happens to me when I drive my Honda after driving another car for so long. Takes a bit to get a feel for the brake pedal and properly modulate my right foot so that it doesn't grab when I'm just stopping at a stop sign.

I've only driven it probably 200 miles and the braking is just one of the weird things about it. I love the way it handles but the response to throttle and brakes are really weird. I tried getting the ECU update so that it does not switch off cylinders as much but the dealer won't touch it without a CEL.

I just don't even get the original post...who rolls up to a stop with constant pressure on the brake pedal? I've always lightened up momentarily before a stop to avoid that awkward ass-bounce that some people seem to do. I've never driven a car that didn't require this basic bit of 'finesse' unless the brake pads were all glazed up or there was a hydraulic problem (i.e. I'm fighting just to actually make the stop).

I think you misunderstood me. The car brakes more at around 12-17mph not when it comes to a complete stop in which case you have to ease off the brakes to prevent the jerking.

[FONT=&quot]I hear you, and ask you,

Is this prob going to fully brake and cause you to a have a serious braking accident,

Or could the box be getting ready to lock up,???. at speed, causing an accident,

Too scary for me, and I would not risk others, I would not drive the car especially with anyone else in it, , listen what everyone says, and if that is not quick enough for you to get the solution, i would go and get brake and gearbox checks, cheap as possible, asap.

Here, where I am, we have a country wide aftermarket competition suspension and brakes company, if they think you are going to buy their product they will do a 27 point safety brake and suspension check on a big computerized machine, for free, then hand you quotes for brake and suspension upgrades,


Also while it was standing I would check oil levels, brakes and box, get under it and check rubber mounts have not recently worn out, could be the reason for the bump sensation,

I hope it is not the gearbox too expensive, just a rubber mount would be a good,[/FONT]

Thanks for that. I don't think it's a brake problem though. I will test braking in neutral or checking the tach to see if it is just downshifting like Zenmervolt suggested

My moms 04 does the same thing, and even after driving it since new I still can't get use to it. Really really hate the way the brakes work in that car. Pretty damn strong, but its also really hard to gently modulate them.

Also had a lot of issues with the stock Honda rotors 'warping', and pad squeel. Eventually just replaced them both with better aftermarket parts and its been great since. Still grabby though.

Strage that it happens with the accord. The TSX I test drove drives like a dream. Easy to accelerate, easy to brake, easy to turn. The accord is finicky with two out of three.

 

[SSSnail]

Just as I suspected, you just need to get used to the brakes feel and adjust your foot pressure accordingly. You don't have enough seat time in that car.

 

[Zenmervolt]

I think you misunderstood me. The car brakes more at around 12-17mph not when it comes to a complete stop in which case you have to ease off the brakes to prevent the jerking.

I all but guarantee that's the transmission dropping into first.

ZV

 

[NutBucket]

Solution: should have bought the MT

 

[Lean L]

I all but guarantee that's the transmission dropping into first.

ZV

It is only hondas that are noticeable? I've never felt downshift while braking before in all the cars ive driven.

 

[Zenmervolt]

It is only hondas that are noticeable? I've never felt downshift while braking before in all the cars ive driven.

Honda uses a unique design for their automatic transmissions that increases the amount of engine braking they provide.

ZV

 

[Lean L]

I just got the ECU updated to the newest version after convincing the dealer for a while. The car feels much better now. ECO mode stays off for a while longer, the brake jerkiness seems to be gone almost completely and the shifting is less erratic. There is still a throttle delay unless you floor it right from the get go. I'm happy though. Feels like a much more pleasant drive for $70