PH Origins: Electronic parking brakes
Love them or hate them, electronic parking brakes are here to stay
For starters, an electronic parking brake only requires a button in the cabin. This gives the designers far more freedom, when it comes to interior design and layout, and frees up a little space. EPBs also grant a range of assistance functions, such as an auto-hold feature for automatically engaging the parking brake when stopping on hills or crawling in traffic.
Because most set-ups use actuators mounted directly to the rear brakes, no parking brake lever, pedal or connecting cables are required; this makes it easier and quicker for the manufacturer to build the car. Compared to drum-in-hat parking brake set-ups, they can also end up being lighter - granting minor emissions, economy and handling benefits.
Additionally, an EPB can automatically stop a car from rolling backwards when stopped on a slope or attempting to set off - saving an inattentive driver from an unwanted bump, or protecting a distracted driver from an incident. It was this type of event that prompted one such early concept of an automatic parking brake, with inventor Sol Seidman - based in Beverly Hills - filing a patent for 'Motor Vehicle Control' in 1927.
The idea of an automatic braking system itself wasn't new, with patents for emergency train carriage brakes dating back to the late 1800s, but Seidman's was seemingly the first to directly reference an automotive application. His patent described many mechanical revisions to make driving easier, including a system that would automatically operate the parking brake when required. Similar ideas followed, all being based on the concept of preventing unintentional rollback and making driving easier.
Advances were made when, in 1955, engineer Robert Hays proposed a more straightforward, effective and electronically operated set-up. The proposed system could monitor the vehicle's current speed, thanks to conductive elements in its speedometer, and - when the car came to a rest - an electric motor would be engaged that would actuate the vehicle's rear drums.
This set-up would become the basis of virtually all future EPB designs, with all either electrically acting on existing parking brake components or making use of motor-on-caliper configurations to clamp pads to discs.
Unsurprisingly, it was the launch of a new flagship model that heralded the introduction of EPBs to the mainstream automotive market. The E65-generation 7 Series, revealed in September 2001 and introduced on 1 November 2001, was packed with equipment - including a Siemens-built cable-actuating EPB, active anti-roll bars and a direct-injection V12.
It was a close-run thing, though; TRW Automotive had been busy developing an EPB system, which featured a more advanced motor-on-caliper arrangement. It almost pipped the BMW to the market, too, finding its way into the flagship Lancia Thesis.
Regardless, the TRW set-up went on to be hugely successful - finding a home in myriad models, ranging from the Jeep Renegade through to the BMW i8. Now, more than 100 million are claimed to be in service. Their remit continues to be extended, too; recent developments include integration with cross-path reversing safety systems, preventing an accident if someone walks behind a reversing vehicle.
While it's hard to beat the instant on/off identification, and quick, easy action of a mechanical parking brake, ever-increasing safety requirements, automation and the demands of most customers means that EPBs will continue to rise in number.
For some reason Audi A3s only engage the full parking brake automatically after the key has been removed when hill hold assist is engaged.
The light also goes out pretty quickly. We'd been sat in the car chatting for a while then got out...car wasn't moving.
I had temporarily turned off hill hold assist then turned it back on (or so I thought - the button doesn't always work). Parked the car and left it outside. Went back out to it and went in the boot..closing the boot caused it to roll off as the handbrake wasn't on after all.
Looked out of the window and it was in the middle of the road having bounced off next door's brick gatepost.
Pretty annoying as I could have sworn I'd checked that the handbrake came on when the key was out. I may not have been pushing hard enough.
Moving my wifes car in the snow and wondering why it wasn't moving much. It was only the next day when I went to drive it that I remembered the lack of automated parking brake...oops!
For what was a standard simple an idiot proof they have made things rather complicated. However as a rule applying the handbrake & holding it on whilst moving does do a nice emergency stop using all the all brakes still stationary.
The one on my GT86 of old was great, as strong as the disk brakes and perfect for initiating nice slides before the turn... Most others on most cars are too weak for any sliding fun beyond very slippery conditions, mostly snow or gravel... Still, don't want to miss out completely...
Now that I have a car with this, I really like the auto functionality. Only thing that troubles me is that the auto mode can be a pain in stop start traffic so I sometimes disengage it only to forget I've done so sometime later and a have a short panic moment. Think that one can be filed away under user error.
I've only ever used parking brakes when parking, and having it has an on/off switch that automatically engages when the car is placed into 'park', with no chance of it not engaging fully, is a huge plus, as is the lack of a sodding great lever in the cabin. Neither are as easy/relevant in a manual though.
For my wife they are even better - her MINI is often parked on a slope, and not always having the strength the fully engage the parking brake, she has to leave the car in gear. Having an electronic brake totally negates that issue.
For what was a standard simple an idiot proof they have made things rather complicated. However as a rule applying the handbrake & holding it on whilst moving does do a nice emergency stop using all the all brakes still stationary.
Unless you're the kind of person who likes doing cheeky handbrake turns everywhere, i'm not sure why you'd miss it. The only point would be the reliability side of things, which i'm not sure of.
By contrast, the z4 (for example of a newer car) epb is useless as you have to have your foot firmly on the brake pedal to allow release of the epb. Then, you don’t use it, and just sit on the brakes instead.
More and more cars have the release functionality, but I wouldn’t buy an epb-equipped car without it now.
I still would prefer a manual lever though.
Did/do the same when in a manual.
The only downside I have ever come across is the slightly less convenience when in a strange manual with a EPB on a steep hill - more difficult to use it to get the bite point.
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