The parking brake is more than just a lever or pedal, but a critical safety element that determines whether your car will stay in place when you stop. According to GOST R 51709-2001 and international standards (for example, ECE R13), the parking brake system must guaranteed to hold a passenger car motionless on a slope up to 23% (about 13°) when equipped. But what does this mean in practice? Why do some cars roll away even with the handbrake pulled on, while others stand rooted to the spot?
In this article we will understand how the parking brake works, what technical requirements are presented to him, and what to do if he has stopped coping with his task. You will also learn how properly test the handbrake before buying a used car and what driver mistakes most often lead to accidents in parking lots.
The parking brake is more than just a lever or pedal, but a critical safety element that determines whether your car will stay in place when you stop. According to GOST R 51709-2001 and international standards (for example, ECE R13), the parking brake system must guaranteed to hold a passenger car motionless on a slope up to 23% (about 13°) when equipped. But what does this mean in practice? Why do some cars roll away even with the handbrake pulled on, while others stand rooted to the spot?
In this article we will understand how the parking brake works, what technical requirements are presented to him, and what to do if he has stopped coping with his task. You will also learn how properly test the handbrake before buying a used car and what driver mistakes most often lead to accidents in parking lots.
How the parking brake system works and why it can fail
The parking brake (or "handbrake") is a mechanical system that locks the wheels independently of the hydraulic brake system. In most passenger cars it acts on rear wheels, but there are exceptions (for example, some models BMW or Mercedes-Benz with an electronic parking brake that can lock all four wheels).
Classic design includes:
- 🔧 Lever or pedal in the cabin (mechanical drive).
- 🔗 Cables, transmitting force from the lever to the brake mechanisms.
- 🛠️ Brake pads or drums, which directly block the wheel.
- 🔄 Adjustment mechanism (to compensate for pad wear).
The main problem is wear of cables and pads. Over time, the cables stretch and the pads wear out, causing the handbrake to no longer hold the car securely. Another common problem is cable corrosion, especially in regions with salty roads. This leads to jamming of the mechanism and uneven application of the brakes.
Parking brake requirements: what the law and manufacturers say
According to Traffic rules of the Russian Federation (clause 2.3.1), the driver must ensure that the brake system, including the parking brake, is in good working order before leaving. But specific technical standards are spelled out in other documents:
| Document | Requirement | Note |
|---|---|---|
| GOST R 51709-2001 | Holding on a slope of 23% (13°) in equipped condition | For passenger cars weighing up to 3.5 tons |
| ECE R13 (UNECE Regulations) | Minimum force on the lever - no more than 400 N (≈40 kg) | For mechanical systems |
| Technical regulations TR CU 018/2011 | The parking brake should hold the vehicle on a 16% (9°) grade when loaded. | Relevant for certification of new cars |
Critical point: if your car does not hold on a slope of 16% (this is approximately 1:6 - one meter of rise per six meters of travel), it will not pass inspection. However, many modern machines (for example, Toyota Corolla or Hyundai Solaris) are designed to hold on steeper slopes - up to 20-25%.
Manufacturers also set their own standards. For example, in the manual Volkswagen Golf it is indicated that the handbrake should hold the car on a slope 20% with lever force no more than 30 kg. Exceeding this threshold is a reason for diagnosis.
How to check the parking brake: step-by-step instructions
You can check the handbrake yourself, without resorting to the help of a service station. You will need:
- 📏 Inclinometer (you can use the application on your smartphone, for example, Clinometer).
- 🚗 Flat area with a slope (parking lot, overpass or natural slope).
- 🔧 Jack (optional, to check the progress of the cables).
Verification algorithm:
- Turn off the engine and put the car in gear (manual) or mode
P(automatic). - Raise the parking brake lever to 3-4 clicks (or press the pedal all the way).
- Engage neutral and slowly release the clutch pedal (on manual) or move the selector to
N(automatically). - If the car starts to move, the handbrake is faulty.
Check the tension of the cables|Inspect the brake pads for wear|Lubricate the cable guides|Bleed the brake system (if the handbrake is hydraulic)|Contact a service station for diagnostics-->
For an accurate check, find the slope 16-20% (can be measured using the app). If the car is held, the system is working. If not, adjustment or repair is required.
⚠️ Attention: Never check the handbrake on a steep descent without insurance! Use wheel chocks or an assistant who can brake the car in case of a stall.
Common driver mistakes that kill the parking brake
Many handbrake problems arise not from wear, but from improper use. Here are the most common mistakes:
- 🚫 Setting the handbrake in winter after washing. The moisture in the brake mechanisms freezes and the pads freeze to the drums. In the morning, you can break the cables while trying to get going.
- 🚫 Using the handbrake instead of the foot brake at a traffic light. This leads to premature wear of cables and pads.
- 🚫 A sharp jerk of the lever. This can break the cables or damage the adjustment mechanism.
- 🚫 Ignoring creaks and jamming. If the handbrake is difficult to lift or does not lock, this is a sign of corrosion or wear.
Particularly dangerous forgetting to release the car from the handbrake before driving. This not only accelerates pad wear, but can also lead to overheating of brake mechanisms and even fire (in extreme cases).
If you often park on a slope, use the “rule of the wheels”: turn them so that when you roll down, the car hits the curb. This will reduce the load on the handbrake.
Electronic parking brake: pros and cons
Modern cars are increasingly equipped electronic parking brake (EPB - Electronic Parking Brake). Instead of a mechanical lever, a button is used, and the wheels are locked by an electric motor. Benefits:
- ✅ Automatic triggering when the engine is turned off (on some models).
- ✅ Auto Hold function, which holds the car on a slope without pressing the pedal.
- ✅ No cables - fewer parts that can wear out or rust.
However, there are also disadvantages:
- ❌ Electronics addiction. If the battery is discharged, the handbrake may not work.
- ❌ Difficulty of repair. Replacing the EPB motor is more expensive than adjusting the cables.
- ❌ Risk of spontaneous operation. In rare cases, the system may lock the wheels while driving.
For example, in Audi A4 (B9) and Volvo XC60 EPB integrated with the system ESP, which allows you to automatically keep the car on the rise. But if the slope sensor fails, the handbrake may not work correctly.
⚠️ Attention: If the icon on the dashboard lights up EPB with an exclamation point, contact service immediately! This could mean either a motor malfunction or problems with the brake pads.
Adjusting and repairing the parking brake: when to go to the service station
If the handbrake stops holding the car, first check:
- Lever travel. Normally it should work on 3-5 clicks. If 6 or more are required, the cables are stretched.
- Condition of the pads. If their thickness is less 1.5 mm, replacement is required.
- Cable play. There should be no snagging or sagging when tensioning.
You can adjust the mechanical handbrake yourself (if you have access to the adjusting nut under the car). To do this:
- Jack up the rear of the car and remove the wheels.
- Loosen the locknut on the adjusting mechanism.
- Tighten the adjusting nut, tensioning the cables until the shoes begin to lightly press against the drum.
- Check the lever travel - it should operate by 3-4 clicks.
If the problem remains after adjustment, the following malfunctions are possible:
- 🔧 Brake drum wear (grooving or replacement required).
- 🔧 Cable jamming (needs replacement).
- 🔧 Broken ratchet mechanism in the handbrake lever.
For electronic handbrake (EPB) self-repair is not recommended - diagnostics using a scanner is required (for example, Launch X431 or Autel MaxiCOM).
If after adjustment the handbrake still does not hold, but the cables and pads are normal, the problem may be in the master cylinder or hydraulic system.
What to do if the handbrake fails while parking
Situation: you put the car on a slope, tightened the handbrake, and an hour later you discovered that the car had rolled. Or worse, the handbrake doesn’t work at all. Here's what you can do:
- Use wheel chocks. Even a brick or a heavy stone can save the situation.
- Engage first gear (manual) or mode
P(automatic). This will create additional resistance. - Turn your wheels toward the curb. If the car starts to roll, it will hit an obstacle.
- Call a tow truck or tug. If the slope is steep, do not take risks - it is better to transport the car to a service center.
If the handbrake fails while driving (for example, the cables are broken), try to stop on level ground and call for help. Driving without a parking brake is dangerous - you will not be able to securely lock the car when stopping.
What happens if you drive with a faulty handbrake?
In addition to the risk of rolling away when parked, a faulty parking brake can lead to:
- Refusal during technical inspection (fine or ban on operation).
- Accelerated wear of the transmission, if you are trying to hold the car with only the gearbox.
- Accidentsif the car rolls back when starting on a hill (especially dangerous for beginners).
FAQ: Frequently asked questions about the parking brake
Is it possible to drive if the handbrake does not hold?
Technically yes, but it's dangerous. According to traffic regulations, operating a vehicle with a faulty brake system is prohibited. In addition, you risk the car rolling away when parked or when stopping on a slope.
How often should you check your parking brake?
Minimum once every six months or before a long trip. If you often park on slopes, check every 3 months. Also be sure to test the handbrake after replacing brake pads or cables.
Why does the handbrake only work on one wheel?
This is a sign uneven cable tension or jamming of one of the brake mechanisms. Most often the problem is corrosion of the cable or guide. Diagnostics and replacement of damaged parts is required.
Is it possible to repair the electronic handbrake yourself?
No. For repair EPB specialized equipment is required (a scanner for resetting errors, a tool for replacing the motor). Attempts on your own may result in the system being blocked.
What to do if the handbrake freezes in winter?
Do not try to move by force - this may break the cables. Pour warm (not hot!) water over the brakes or use a defroster (for example, WD-40). After thawing, dry the brakes by pressing the brake pedal several times while driving.