Motoring Discussion > Parking brake in automatics Miscellaneous
Thread Author: movilogo Replies: 5
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New Fri 25 Mar 11 12:53 
 Parking brake in automatics - movilogo

In a manual car, you can park the car in gear. So if parking brake fails, it will still stay at same place.

In a conventional/torque converter automatic, you can keep it in P mode. So if parking brake fails, car should still not move as the parking prawl locks the transmission.

But what happens in semi automatic cars like DSG, CVT etc.?
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New Fri 25 Mar 11 13:19 
 Parking brake in automatics - lancara
Google is your friend:

"There is a locking mechanism and ring gear on the front differential on DSG equipped cars, when you put the gearbox in “P”park, “that” mechanical action moves a lug that engages with the ring gear to lock the differential to the No#1 output shaft from the gearbox."

Incidentally, I'm not sure a DSG should be described as "semi-automatic". It can be driven in automatic mode the same as a TC auto, or as a manual.
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New Fri 25 Mar 11 13:26 
 Parking brake in automatics - movilogo
IIRC Vauxhall easytronics does not have P mode!
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New Fri 25 Mar 11 14:29 
 Parking brake in automatics - Lygonos
No 'P' mode and handbrakes known to spontaneously release - good work Vauxhall!
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New Fri 25 Mar 11 14:32 
 Parking brake in automatics - ....
EGS you just leave the lever in A or M. When the engine stops, the gear is selected just like a manual and stops the car rolling.
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New Sat 26 Mar 11 12:51 
 Parking brake in automatics - Bagpuss
The VAG group DSG and CVT transmissions have a "P" mode. In fact the gear selector gate is identical in all their automatic transmissions - PRNDS. You can only tell which transmission it is by the label on the trim ring in front of the gear selector, oh and by the whiney noise from the engine if it is a CVT box.
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