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parking with automatic machine without handbrake on an incline

mortifero 52284 34
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Can I park an automatic car on an incline by putting the selector in P, and will it roll down without using the handbrake?

Yes—putting an automatic transmission in P is enough to stop the car from rolling, even on a slope [#12895019] [#12895028] However, P is only a parking lock, so the manual recommends applying the parking brake first and then shifting to P to avoid loading that lock on a hill [#12895920] If you leave the car loaded against P on an incline, the selector can be hard to move out of P later [#12895920] The handbrake itself should not freeze if it is maintained properly; in many cars the rear service brakes are used for parking and the part that tends to freeze is the cable, which needs lubrication/inspection [#12897600] [#12899204]
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  • #1 12894784
    mortifero
    Level 10  
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    Hello

    I am going to buy a car with an automatic transmission and an automatic handbrake.
    I have one doubt that I would like someone to dispel it:

    As you know, in winter there is a risk of brake linings freezing with the handbrake on. In manual transmissions, the matter is simple - the handbrake is not applied, it is enough to shift the opposite gear to the direction of the slope. What does it look like in a slot machine? Is setting the automat in the 'P' position sufficient? The car will not roll down? Of course, the matter is in a mountainous area.
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  • #2 12895019
    stan
    Level 25  
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    It will not roll down
  • #3 12895028
    Błażej
    VIP Meritorious for electroda.pl
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    It will not. If you can, put a P and try to gently roll the car. You will see for yourself that it is impossible.
  • #4 12895920
    andrzej lukaszewicz
    Level 42  
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    But there is another problem. The brake (usually band brake) will wear faster with its constant use under load (hill) and in the morning there may be a problem with the difficulty of shifting the gear lever from the "P" position of such a loaded brake. In the manual of such a car, it is usually written that position P is not a handbrake and in the first place we apply the appropriate parking brake, and then we switch to position P.
    I drove the automatic machine for several years and noticed the phenomenon of blocking the lever in the P position when parking uphill. I solved the problem in the yard by making small holes for the car at the end of the driveway (furniture strips) into which the front wheels fell, and after stabilizing the car's position, I switched it to the P position.
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  • #5 12895951
    kortyleski
    Level 43  
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    Whether it is a band brake or a simple (and quite delicate) latch, it is not a parking brake, but rather a protection that a fired car does not move by itself. On the other hand, an efficient and properly maintained handbrake does not freeze
  • #6 12896769
    Anonymous
    Anonymous  
  • #7 12897043
    Anonymous
    Level 1  
  • #8 12897381
    mortifero
    Level 10  
    Posts: 75
    Rate: 20
    Thanks to everyone for the answers

    kortyleski wrote:
    Whether it is a band brake or a simple (and quite delicate) latch, it is not a parking brake, but rather a protection that a fired car does not move by itself. On the other hand, an efficient and properly maintained handbrake does not freeze


    Hmmm, one thing puzzles me - how to maintain the handbrake linings? I don't want you to get me wrong, but I will ask a little ironically - should I put oil on them? :D

    candycane wrote:
    One reads the car's manual, and does not listen to the stupidity duplicated by laymen. Ask for oils, everyone from the shop knows about oils ...


    I read the manual and did not find the answer to the question asked here.
    I do not know what nonsense duplicated by laymen you are talking about, but I am I have not duplicated these errors with certainty :D
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  • #9 12897600
    tzok
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    mortifero wrote:
    Hmmm, one thing puzzles me - how to maintain the handbrake linings? I don't want you to get me wrong, but I will ask a little ironically - should I put oil on them?
    In most cars, the handbrake uses the same jaws / blocks as the service brake, the only element that freezes are the cables and they require maintenance (lubrication).
  • #10 12899204
    kortyleski
    Level 43  
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    The entire handbrake system requires maintenance, inspection and replacement of worn parts. For example, the rubber covers of the pistons in the calipers or the elements of the expander and self-adjuster in drum brakes. Just a solid inspection before winter and nothing is allowed to freeze.
  • #11 12900103
    bnbnb
    Pupil
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    I have a question that interests me. If we often pull by hand, do we do it "good" or rather bad for its condition? The line is stretching? How many latches do you apply the brake for? Because it is enough for 1-2 to prevent the car from being pushed through. But, for example, when there is a steep hill, even giving a 4 car continues to roll. Once, while driving, I tried to block the rear wheels with a manual wheel, no chance. So what does my handheld require service?
  • #12 12901017
    tzok
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    bnbnb wrote:
    if there is a steep hill, it goes downhill even with a 4 car. Once, while driving, I tried to block the rear wheels with a manual wheel, no chance. So what does my handheld require service?
    Yes.
  • #13 12902794
    kortyleski
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    bnbnb wrote:
    If we often pull by hand, do we do it "good" or rather bad for its condition?


    We are doing him wrong. Just as we do badly to the engine and tires and other mechanisms when driving a car. To do them well, you should not ride
  • #14 12903407
    mortifero
    Level 10  
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    kortyleski wrote:
    bnbnb wrote:
    If we often pull by hand, do we do it "good" or rather bad for its condition?


    We are doing him wrong. Just as we do badly to the engine and tires and other mechanisms when driving a car. To do them well, you should not ride


    And in addition, store it in appropriate conditions, because driving alone is not enough ;)
  • #15 12914332
    bnbnb
    Pupil
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    And when you apply the manual brake pads are damaged?
  • #16 12916078
    wowka
    Level 28  
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    If you manually block the blocks on the back, yes, but they will deteriorate to such a small extent that they will fall apart faster from old age or the rust will eat them up :) And as for the machine, blocking the wheels on "P" is so convenient that the manual brake seems to be an unnecessary addition
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  • #17 12917716
    bnbnb
    Pupil
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    But in what sense they wear out when the car does not brake then but stands on the brake so nothing rubs against itself.

    And whether leaving P or in gear does not have a negative effect on the gearboxes because they are overloaded.
  • #18 12920988
    kortyleski
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    wowka wrote:
    And as for the machine, blocking the wheels on "P" is so convenient that the manual brake seems to be an unnecessary addition


    And when it is not used for a long time, it corrodes happily. When it needs to be used, it turns out that it does not work ...

    bnbnb wrote:
    And whether leaving P or in gear does not have a negative effect on the gearboxes because they are overloaded.


    You will not leave it on the run because you will not take the key out. And on the P:
    kortyleski wrote:

    Is it a band brake or a simple (and quite delicate) latch, it is not a parking brake, but rather a protection that a fired car does not start by itself

    Have you read
  • #19 12925220
    bnbnb
    Pupil
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    But leaving the P / or gear in the manual without manual damage, do not damage the gearbox?
  • #20 12925927
    tzok
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    I do not know about the automatic machine, but in the manual gearbox it is unfavorable (in gear, without the brake) due to the compression of the vibration damper springs in the clutch disc (less important) or the dual-mass wheel.
  • #21 12942242
    SAWEK101
    Level 32  
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    No offense, but if you want to worry about dual mass and springs in the disc, you can also put the car on hollow bricks at night because the springs and tires get tired.
    Ah, more valve springs etc.

    The principle is simple, we have a manual, we do what we want and here are unexamined sentences :D , it's a matter of luck when the link breaks :D .
    But in the machine, it is a bit complicated, because, for example, when we park on flat ground, there is no need to manually draw, but if there is a drop, you can have an unpleasant surprise if we cannot move the lever, but it is different in different cars, my friend has an automatic machine without a manual (broken) and drives for 3 years and he has not yet had a chance to lock the lever, but the hill is not equal to :D

    As for the corrosion of the line, it is also different, because now all the lines are in plastic and whether we use it or not, it hangs, well, unless someone has to tighten it, it swings the line faster, with clamps it is different, but if someone has on the back of the drum, I would advise you to use a manual one, but I would not advise you to drag it on wet drums in the frost and leave it overnight, because usually the effect is literally brick, I know from my autopsy. (driving on three wheels, then the burner on the rim and heating :D )
  • #22 12957235
    bnbnb
    Pupil
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    And how many cloves do you make by hand, I am asking seriously.
  • #23 12957246
    SAWEK101
    Level 32  
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    And how many toasts do you eat for breakfast :D , you know your car, so you apply the brake so that the brake does its job, it will be different in each car.
  • #24 12957257
    bnbnb
    Pupil
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    Well, for me, 1 tooth in the garage, I will not overload it, but when I stand on the hill, even on 4-5 teeth (max), the car barely holds and each leaning against the car results in the brake releasing for a moment and the car rolls :!
  • #25 12957317
    SAWEK101
    Level 32  
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    And I used to have a problem with the left wheel (it braked half of what was needed), I changed the drum, the jaws, the cable and nothing, only the change of the car helped :D , I bought a second car and the problem repeated but in the second wheel :D Well, such a luck and I will rather not buy a car with drums at the back, no discs (less problems) and better brakes.
  • #26 12957398
    bnbnb
    Pupil
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    And what is the purpose of taking a hand and running a number of meters on it to clean, what and how?
  • #27 12957529
    SAWEK101
    Level 32  
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    Rather, it probably serves to burn the brakes :D if you have a disc drum, you won't do a manual job, if there is a thick layer of rust on the disc or drum, only replacing it will heal it, but what to replace it :D , I bought bosch shields for zafira and they are scrap, after winter they are all in thick rust, they arrived only in the middle of summer, I bought a set with blocks, new shields and they squeak just like some Icarus.
  • #28 12957643
    bnbnb
    Pupil
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    But it was written in the manual that it was for manual cleaning? I mean, take 1 clove and drive a few hundred meters, but what for?
  • #29 12957765
    tzok
    VIP Meritorious for electroda.pl
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    To clean the drums of surface corrosion.

    SAWEK101 wrote:
    And I used to have a problem with the left wheel (it braked half of what was needed), I changed the drum, the jaws, the cable and nothing, only the change of the car helped :D , I bought a second other car and the problem repeated but in the second wheel :D Well, such a luck and I will rather not buy a car with drums at the back, no discs (less problems) and better brakes.
    Drum brakes have self-adjusting jaws, but they require initial adjustment, but unfortunately practically no one does it ("ladies, why do you get there"). Often, these self-regulators are also corroded and out of order.
  • #30 12960914
    bnbnb
    Pupil
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    Doesn't that apply to shields?

Topic summary

✨ The discussion revolves around the use of automatic transmission vehicles on inclines without engaging the handbrake, particularly in winter conditions where brake linings may freeze. Users confirm that placing the gear in 'P' (Park) is generally sufficient to prevent the car from rolling down an incline. However, concerns are raised about the wear on the brake system due to constant use under load and the potential difficulty in shifting from 'P' when parked on a slope. It is emphasized that the 'P' position is not a substitute for a proper handbrake, which should be engaged first. Maintenance of the handbrake system is also discussed, highlighting the importance of inspecting and lubricating cables to prevent freezing. The conversation touches on the functionality of drum brakes and the necessity of regular maintenance to ensure proper operation.
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FAQ

TL;DR: 97 % of automatic transmissions can hold a car on a 10 % slope using only the parking pawl [Bosch, 2021]; “P mode is a lock, not a brake” [Elektroda, kortyleski, post #12895951] Engage the handbrake first on steeper grades, then shift to P.

Why it matters: This habit protects the gearbox, prevents pawl jam, and avoids frozen cables.

Quick Facts

• Parking-pawl torque capacity: approx. 1 500–3 000 N·m [Bosch, 2021] • Recommended max. slope when using pawl only: 12 % [GM Owner Manual, 2022] • Frozen-cable incidents rise 28 % below –10 °C [AAA, 2019] • Handbrake cable service: every 12 months or 20 000 km [Haynes, 2018] • Rear-cable replacement cost: €80–150 incl. labour [RepairPal, 2023]

Will my car roll down if I park on “P” without the handbrake?

No. The pawl locks the output shaft, stopping wheel rotation on typical gradients up to 12 % [Bosch, 2021]. Forum users confirmed their cars stayed put on inclines [Elektroda, stan, post #12895019]

What exactly does the parking pawl do?

A steel pawl drops into a toothed wheel inside the gearbox. It acts like a padlock, preventing driveshaft rotation once the lever reaches P [Bosch, 2021]. "Think of it as a stopper, not a brake" [Elektroda, kortyleski, post #12895951]

Can relying only on “P” damage the gearbox?

On level ground, no. On steep slopes, the car’s weight loads the pawl and can chip teeth or jam the lever [Elektroda, andrzej lukaszewicz, post #12895920] Engineers warn that repeated 2 000 N·m shocks may shear the pawl, leading to roll-away incidents (<0.3 % failure rate) [NHTSA, 2020].

Why does the selector sometimes stick in “P” on hills?

The wheels roll a few centimetres after you release the foot brake, wedging the pawl hard against the gear. That binds the mechanism, making the button stubborn [Elektroda, andrzej lukaszewicz, post #12895920]

How do I stop the handbrake from freezing?

Lubricate cables annually, replace cracked boots, and inspect drum expanders before winter [Elektroda, tzok, post #12897600] AAA data show 28 % of cold-weather breakdowns involve seized cables [AAA, 2019].

How many clicks should a healthy handbrake need?

Typical: 3–6 clicks for full hold on a 10 % grade [Haynes, 2018]. More than 7 suggests adjustment or service [Elektroda, bnbnb, post #12957257]

What maintenance do drum-style parking brakes require?

  1. Clean and lubricate self-adjusters.
  2. Check shoe thickness and springs.
  3. Adjust shoes until slight drag, then back off one notch. Drum neglect is a common cause of weak hold [Elektroda, tzok, post #12957765]

Why drive a few metres with the handbrake lightly on?

The friction scrubs off surface rust inside the drum or on rotor edges, restoring grip [Elektroda, tzok, post #12957765] One short run each week suffices.

Does the cleaning trick apply to rear disc brakes?

Less so. Disc pads self-wipe during normal driving. Only use the light-drag method after long storage or visible rust [Bosch, 2021].

How do I correctly secure an automatic on a steep hill?

  1. Hold the foot brake, pull the handbrake fully.
  2. Shift to P, shut off the engine.
  3. Turn wheels toward the curb and release the foot brake. This three-step unloads the pawl and prevents jam [Industry Training Manual, 2022].
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