Operation of "auto hold" braking

[jimmy buoy]

Two cars, seven years, 80,000 miles and I let the parking brake go on. Especially good if you are parked on a slope.

I have to wonder if you are doing more potential damage by not using it..

You have a point there. Many cars have seized parking brakes due to lack of use. As said, I use the Auto Hold system regularly which works the parking brake system so all should be good.

 

[EdP]

You have a point there. Many cars have seized parking brakes due to lack of use. As said, I use the Auto Hold system regularly which works the parking brake system so all should be good.

Auto Hold actually uses the ABS system.

 

[jimmy buoy]

Auto Hold actually uses the ABS system.

That's odd then, since I hear a similar sound to a cordless drill being used to tighten down a nut onto a bolt until it comes to a stop. That sound happens immediately after shutting down the car while in park and seems to be coming from under the rear wheel area. Doesn't the electric parking brake use a small motor/gear assembly to manually press the pads onto the discs for the rear wheels? I can't see the ABS system making the whirring noise that I'm hearing, but the electric parking brake would.

Here's how a VW electric parking brake operates - Seems like this is a typical setup though.

One other thing noticed is the next time I start the car, the Parking Brake indicator is illuminated on the dash and turns off once the transmission is engaged in either Drive or Reverse. It seems that the Hold system does use the ABS system while the car is running, but having the Hold system on when parking the car and shutting it off automatically engages the Electronic Parking Brake.

 

[skipgen]

That's odd then, since I hear a similar sound to a cordless drill being used to tighten down a nut onto a bolt until it comes to a stop. That sound happens immediately after shutting down the car while in park and seems to be coming from under the rear wheel area. Doesn't the electric parking brake use a small motor/gear assembly to manually press the pads onto the discs for the rear wheels? I can't see the ABS system making the whirring noise that I'm hearing, but the electric parking brake would.

Here's how a VW electric parking brake operates - Seems like this is a typical setup though.

One other thing noticed is the next time I start the car, the Parking Brake indicator is illuminated on the dash and turns off once the transmission is engaged in either Drive or Reverse. It seems that the Hold system does use the ABS system while the car is running, but having the Hold system on when parking the car and shutting it off automatically engages the Electronic Parking Brake.

Completely normal in my experience. Freaked me out the first time I heard it though.

 

[joegr]

That's odd then, since I hear a similar sound to a cordless drill being used to tighten down a nut onto a bolt until it comes to a stop. That sound happens immediately after shutting down the car while in park and seems to be coming from under the rear wheel area. Doesn't the electric parking brake use a small motor/gear assembly to manually press the pads onto the discs for the rear wheels? I can't see the ABS system making the whirring noise that I'm hearing, but the electric parking brake would.

Here's how a VW electric parking brake operates - Seems like this is a typical setup though.

One other thing noticed is the next time I start the car, the Parking Brake indicator is illuminated on the dash and turns off once the transmission is engaged in either Drive or Reverse. It seems that the Hold system does use the ABS system while the car is running, but having the Hold system on when parking the car and shutting it off automatically engages the Electronic Parking Brake.

Auto hold uses the ABS system to hold the normal (hydraulic) brakes on when you come to a stop while you are in drive. If you turn the car off while auto hold is active, then it does apply the parking brake for you.

 

[carguy75]

That's odd then, since I hear a similar sound to a cordless drill being used to tighten down a nut onto a bolt until it comes to a stop. That sound happens immediately after shutting down the car while in park and seems to be coming from under the rear wheel area. Doesn't the electric parking brake use a small motor/gear assembly to manually press the pads onto the discs for the rear wheels? I can't see the ABS system making the whirring noise that I'm hearing, but the electric parking brake would.

Here's how a VW electric parking brake operates - Seems like this is a typical setup though.

One other thing noticed is the next time I start the car, the Parking Brake indicator is illuminated on the dash and turns off once the transmission is engaged in either Drive or Reverse. It seems that the Hold system does use the ABS system while the car is running, but having the Hold system on when parking the car and shutting it off automatically engages the Electronic Parking Brake.

The Genesis uses a different setup that do not place the parking brake motors on the rear calipers. The parking brake motor in located under the chassis(central unit) and controls the parking brake shoes with brake cables like a standard braking system with manual control .

I like the Genesis parking system better than the VW system that requires a special tool and software to change the rear pads and rotors due to the motorized brake pistons.

The motor sound is normal when first engaging the parking system and when turning it off. The system is quiet during normal driving when already activated until you park the car in auto mode.

 

[MaxPower]

My Auto Hold on my GV70 is always on except when I'm inching it out of the garage.

Since there's only hand wash for me I'll never have the experience mentioned above.

 

[carguy75]

Auto hold uses the ABS system to hold the normal (hydraulic) brakes on when you come to a stop while you are in drive. If you turn the car off while auto hold is active, then it does apply the parking brake for you.

Correct. However the auto hold system uses the parking brake motor when on a slope or the auto hold system has been triggered at a stop for more than 10 minutes.

 

[jimmy buoy]

The Genesis uses a different setup that do not place the parking brake motors on the rear calipers. The parking brake motor in located under the chassis(central unit) and controls the parking brake shoes with brake cables like a standard braking system with manual control .

I like the Genesis parking system better than the VW system that requires a special tool and software to change the rear pads and rotors due to the motorized brake pistons.

The motor sound is normal when first engaging the parking system and when turning it off. The system is quiet during normal driving when already activated until you park the car in auto mode.

Great explanation - Thank You!