That device appears to be purely mechanical perhaps, I didn't' read about it There are electric ones also, for sure. But they are mainly for short period parking brake function on all 4 wheels. For serious use, or longer periods, I would expect some slow bleed off of hydraulic brake pressure. - Like a leaky rear wheel cylinder could allow your rig to run off down the hill when you weren't looking, after sitting a while with it applied. Hydraulic brake systems are not designed for continuous steady pressure . Yeah, these valves are 'brake pressure holder' valves. You step on the pedal, applying pressure that way, and the device holds that pressure after you take your foot off the brake. A purely mechanical parking brake has it's obvious advantages. If you are asking if a regular parking brake is also a backup emergency brake, yup, they are. Called parking brake and e-brake interchangeably.
-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Mike Elliott Sent: Tuesday, April 08, 2008 3:12 PM To: vanagon@GERRY.VANAGON.COM Subject: Re: Foot actuated parking brake On 4/8/2008 2:37 PM VW Doka wrote: > Or you could keep it simple and use one of these: > > http://www.mooreparts.com/store/product/2769/AC611590/ I'm a little dim in the area of brakes and the wonderfulness of how they work. So for this little hydraulic brake park lock thing, um, you step on the brake pedal, push the plunger on the lock and it keeps the pressure on the brake piston thingies or something? If the mechanical pull lever is intended as a parking brake, the lock could be cool. But if viewed as an e-brake, well, isn't it intended to provide some kind of backup in case the hydraulic system sprang* a leak?
== * Is "sprang" a word? Sprung? Sprunged? Springed? -- Mike "Rocket J Squirrel" Elliott 71 Type 2: the Wonderbus 84 Westfalia: Mellow Yellow ("The Electrical Banana") 74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano KG6RCR
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