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Mazda5 Brake Questions

46 messages,  Last post on Oct 08, 2009 at 8:48 AM

You are in the Mazda Mazda5 Forum. Your Host is Karens

What is this discussion about? Mazda MAZDA5, Brakes, Wagon


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#27 of 46
Re: 'Freezing' brakes in heavy snow [kanata] by athenasius
Jan 17, 2008 (8:03 pm)
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Replying to: kanata (Dec 16, 2007 8:37 pm)

I also live in eastern Ontario and have only had this happen 2 times and both were when i drove through the heavier snow getting onto a recently plowed road. Both times i just drove a bit more causiously and after the car had sat for a bit the packed snow had melted and was fine. light and funny feeling peddle and all.
 
I still love the car, just hate how they messed up the transmition when they 'udated' it after the idiots had driven in 2nd gear for hours at highway speeds. They did not fix the issue(update) as it can be repeated on what was then new 2007 cars so they put in the 5 speed from mazda 3 also increasing the mpg at the same time. If you want to duplicate the issue try slowing down, when car is in 3rd, as if for a stop light and then having the light turn green put your foot on the gas there is a hesitation and then it grabs-thud. You can also see it as the dash gear display does not change as the exact same time as the actual transmition. I spoke to one of the engineers and he said they 'dumbed' down the transmision and as not enought people complained they were not bothered fixing it.
#28 of 46
Rolling Backwards on Hills in Gear by cecily
Feb 12, 2008 (2:34 pm)
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I live in hilly San Francisco, and find my automatic 2007 Mazda 5 and have great difficulty w/ my car rolling backwards when in gear. When I'm stopped at a traffic light on a hill, if I remove my foot from the foot brake to begin acceleration, the car will roll back indefinitely until I am able to apply the gas enough to get the car moving forward. My previous car was a manual transmission, so I'm new to an automatic, but this strikes me as incredibly odd and unsafe. I'm forced to use both feet when accelerating from a stand still on a hill, keeping one foot on the brake, while accelerating w/ the right foot until there's enough speed to send the car forward. Is this common on the model, or just a fluke w/ my car? Has anyone has luck getting this remedied?
#29 of 46
Re: Rolling Backwards on Hills in Gear [cecily] by maltb
Feb 12, 2008 (4:19 pm)
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Replying to: cecily (Feb 12, 2008 2:34 pm)

If the automatic is unsafe where you have the same number of pedals as you have feet (I'm making a big assumption), how did you manage when your feet were outnumbered 3-2?
 
With that out of the way, you have to figure that the car weighs ~3,400lbs and it's powered by a 2.3L engine that makes very little torque at idle. If the engine is required to hold the vehicle against an incline, the fuel consumption would need to be increased to support the vehicle. Of course, you'd wonder why your mileage was reduced.
 
Say, does Subaru still make cars with the hill-holder feature? Steve_host would know that one.
#30 of 46
Re: Rolling Backwards on Hills in Gear [cecily] by coolmazda5
Feb 12, 2008 (4:31 pm)
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Replying to: cecily (Feb 12, 2008 2:34 pm)

I'm not sure if San Francisco is common for any model , but it should be normal to see that. Now, if you used to drive manual tranny, driving an auto on an incline should be much easier to control, no need to juggle with the clutch
 
The other option is to get a Nissan GT-R, but it is a little bit pricy
 
Drivetrain
• ATTESA ET-S All-Wheel Drive (AWD) with independent rear-mounted transaxle integrating transmission, differential and AWD transfer case.
• Rigid, lightweight carbon-composite driveshaft between engine and transaxle.
• Electronic traction control plus 1.5-way mechanically locking rear differential.
• Vehicle Dynamics Control (VDC-R) with three driver-selectable settings: Normal (for daily driving, controls brakes and engine output), R-Mode (for ultimate performance, utilizes AWD torque distribution for additional vehicle stability) and Off (driver does not want the help of the system).
• Hill Start Assist prevents rollback when starting on an incline.
#31 of 46
Re: Rolling Backwards on Hills in Gear [cecily] by mdchachi
Feb 15, 2008 (12:06 pm)
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Replying to: cecily (Feb 12, 2008 2:34 pm)

That's normal behavior for an automatic. I can see how that might be bothersome if you used to use the handbrake to prevent rollback and you no longer have a handbrake. Anyway, if this bothers you, look for a vehicle that has "hill start assist" in your next vehicle. It might be a useful feature in SFO.
#32 of 46
Re: Rolling Backwards on Hills in Gear [mdchachi] by andydico
Feb 15, 2008 (1:13 pm)
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Replying to: mdchachi (Feb 15, 2008 12:06 pm)

Try it in a car with 800cc engine, manual tranny and 5 people inside. I have to rev the engine and use the handbrake to hold the car from sliding backwards.
#33 of 46
Re: Rolling Backwards on Hills in Gear [coolmazda5] by cecily
Feb 22, 2008 (8:32 am)
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Replying to: coolmazda5 (Feb 12, 2008 4:31 pm)

Thanks so much for all the info about rolling, and hill assist--definitely a great feature for SF! I'm still concerned, as it seems odd to have to keep my foot on the foot brake while I accelerate to get up the hill. It's actually MORE difficult to get up a hill than in my previous manual VW Jetta GLX. Perhaps it's just because this car does not have a powerful engine. My husband's Ford Taurus does not do this, and I don't believe he has hill assist. Does an automatic switch into neutral when stopped, or is it in first gear?
#34 of 46
Re: Rolling Backwards on Hills in Gear [cecily] by mrbwa1
Feb 22, 2008 (10:33 pm)
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Replying to: cecily (Feb 22, 2008 8:32 am)

It really depends on the car/transmission. All traditional automatics have a fluid pump to circulate the transmission fluid through the torque converter and through the passages to shift. Newer cars have replaced fluid pressure shifting with electronics. Also, different transmissions will essentially have different pressures depending ont he engine they are mated to. The traditional large American car has enough pressure at idle to hold the vehicle stationary. Newer, and especially smaller cars don't have this pressure. I would attribute it to both less horsepower in an engine to have to cope with (well technically less torque to multiple in the torque converter) but also it is a side effect of more efficient pieces meaning more power goes directly to the wheels and int he long run a little better fuel economy.
 
If nothing else, you can always use the old parking brake trick. It'll wear the parking brake pads sooner, but they have to be cheaper then a pair of new bumpers from a roll-back!
#35 of 46
Re: Rolling Backwards on Hills in Gear [mrbwa1] by cecily
Feb 25, 2008 (10:59 am)
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Replying to: mrbwa1 (Feb 22, 2008 10:33 pm)

Thanks so much. You're all wealths of knowledge!
#36 of 46
Re: Rolling Backwards on Hills in Gear [mrbwa1] by maltb
Feb 25, 2008 (3:05 pm)
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Replying to: mrbwa1 (Feb 22, 2008 10:33 pm)

That's not really correct, but if it makes cecily happy it's good enough.
 
Shifting in Automatic Transmission is still done by fluid pressure but the directing of the fluid on newer cars is done by computer controlled electrical servos, and not a mechanical valve body.
 
Also, the pressure is not what holds holds the car. Rather, it's basically the amount of slippage that the torque converter allows at idle that "holds" the car. This slippage is allowed up to a certain RPM (stall speed). While this stall speed is mostly part of the TQ's inherent design, it can be overridden by a fluid servo that will do nothing more than lock the torque converter (typically at highway speed).

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