Home » Public Forums » GMCnet » Legality of a hydraulic parking brake
| Legality of a hydraulic parking brake [message #350827] |
Thu, 19 December 2019 08:20  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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During a most recent discussion with Dave Lenzi (aka the Wizard), he showed us his prototype of a hydraulic parking brake. During said discussion he mentioned that there are now, in production, several light truck models that use a hydraulic parking brake. As nearly as he could tell, the regulation only requires that the parking brake be an isolated system and cannot require the integrity of the service brake to function. This being the case, he was looking at an independent caliper and master cylinder system.
As I recall, he had these parts at Elkhart, but of that I am not certain.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Legality of a hydraulic parking brake [message #350829 is a reply to message #350828] |
Thu, 19 December 2019 09:00  |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma: -41
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Or put in one of these:
epman-high-quality-hydraulic-racing-drift.jpg
It already has a lock. I added a die spring to keep the pressure up.
Works great.
Dolph
DE AD0LF
Wheeling, West Virginia
1977 26’ ex-PalmBeach
Howell EFI & EBL, Reaction Arms, Manny Transmission
“The Aluminum and Fiberglass Mistress"
> On Dec 19, 2019, at 9:43 AM, tonka6cuda6--- via Gmclist wrote:
>
> Not exactly sure of the legal requirements either but if one wanted to add a second system one just has to look to the "drifting and rally community"
> as they already run a separate manually applied rear brake system....it would just be a matter of figuring out a way to couple the current park brake
> lever to the pushrod of the secondary master cylinder [the current versions use a handle affixed]. Dang i wish i still had my shop as this would be a
> fun one to build up..... :(
> --
> Rich Mondor,
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> Brockville, ON
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> 77 Hughes 2600
>
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| Re: [GMCnet] Legality of a hydraulic parking brake [message #350834 is a reply to message #350830] |
Thu, 19 December 2019 12:30 |
Dave Stragand
Messages: 307
Registered: October 2017
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Both my Dodge Magnum and my Wife’s Subaru have what we referred to as “Drisc” brakes. There is a disc on the outside for stopping, and a drum on the inside for a parking brake. If someone was so inclined, I imagine a suitable combination of parts could be plucked from the parts bins for our coaches.
-Dave
1978 Transmode near Pittsburgh
> On Dec 19, 2019, at 5:44 AM, John R. Lebetski via Gmclist wrote:
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> Off road/racing use and highway use are two different animals.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
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1978 Transmode (403)
Pittsburgh, PA
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| Re: Legality of a hydraulic parking brake [message #350835 is a reply to message #350833] |
Thu, 19 December 2019 12:50 |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
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RF_Burns wrote on Thu, 19 December 2019 13:32Those of us who live in the Rust Belt know how poor the cable applied parking brakes are. They just rust up and chances are if you get them ON, they won't come OFF!.
The parking brake on my 2017 GMC pickup is already seized and I expect it won't take too long before the new 2019 is seized too. Yes I was using them periodically, but you need to be vigilant about keeping the cables lubed... but still its only a matter of time...
There are electrically operated parking brake calipers as well. I'm hoping that will solve our problem.
Yup if i get a bit of time to play with this coach or someone beats me to it, i will have electro park brake calipers on my unit in the near future....i hate messing with the cables....
Rich Mondor,
Brockville, ON
77 Hughes 2600
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| Re: [GMCnet] Legality of a hydraulic parking brake [message #350836 is a reply to message #350834] |
Thu, 19 December 2019 12:51 |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
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Not sure if thats a step forward or backwards.....yes we have disc and Pbrake but we still need cables..... 
Dave Stragand wrote on Thu, 19 December 2019 13:30Both my Dodge Magnum and my Wife's Subaru have what we referred to as "Drisc" brakes. There is a disc on the outside for stopping, and a drum on the inside for a parking brake. If someone was so inclined, I imagine a suitable combination of parts could be plucked from the parts bins for our coaches.
-Dave
1978 Transmode near Pittsburgh
> On Dec 19, 2019, at 5:44 AM, John R. Lebetski via Gmclist wrote:
>
> Off road/racing use and highway use are two different animals.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
>
>
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Rich Mondor,
Brockville, ON
77 Hughes 2600
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| Re: [GMCnet] Legality of a hydraulic parking brake [message #350838 is a reply to message #350830] |
Thu, 19 December 2019 13:01 |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma: -41
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Senior Member |
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John:
I completely appreciate that.
Nothing in my braking system is as it came from the factory. Not even the front calipers.
Regardless of the certifications obtained by the manufacturer, I chose good quality, made in USA parts, including the “drift handle” that I modified.
It’s single cylinder is from Kelsey Hayes, and I have no reason to believe it’s not the same components as their commercial or certified “highway” product.
It’s completely passive when I’m not using it, so as long as it does not breach, I have rear brakes.
If I pull on it and it fails, I’m no worse off than I was before.
But, when I pull on it and it works, there’s magic!
Dolph
DE AD0LF
Wheeling, West Virginia
1977 26’ ex-PalmBeach
Howell EFI & EBL, Reaction Arms, Manny Transmission
“The Aluminum and Fiberglass Mistress"
> On Dec 19, 2019, at 10:34 AM, John R. Lebetski via Gmclist wrote:
>
> Off road/racing use and highway use are two different animals.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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| Re: Legality of a hydraulic parking brake [message #350846 is a reply to message #350833] |
Fri, 20 December 2019 17:22 |
Rick Staples
Messages: 126
Registered: May 2014
Location: Johnstown, Colorado, USA
Karma: -1
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Senior Member |
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Bruce wrote: "Those of us who live in the Rust Belt know how poor the cable applied parking brakes are. They just rust up and chances are if you get them ON, they won't come OFF!"
I used to live in the rust belt (Massachusetts), and most of my automotive experience was there. In the little town (Pelham) where I lived, the state used so much salt on US 202 that it polluted wells hundreds of yards away, and the state was forced to buy out and relocate some property owners as no clean water could be found on their lots. I've had more nice cars rust out under me than I care to remember.
That said, I also recall that Mass. was very strict about parking brakes. Inspection was twice yearly (later annually with emissions), and that parking brake had to be capable of stalling the engine in first gear at idle (a real problem when diesels came along). I always advised my customers to set the brake EVERY time they parked, unless parking for a period of days. I said "If you don't use it, you won't have it when you need it, whether in emergency or to pass inspection." Those that followed this advice, myself included, ALWAYS passed the brake inspection.
The only caveat in regard to GMCs is that they tend to sit for extended periods, so the parking brake shouldn't be left on in that case. (I've seen brake shoes rust solidly to the drum after sitting for months. Even seen clutch discs rust to the flywheel.) Still, the best advice is to exercise that brake frequently, and lube the cables if you can.
My .02
Rick Staples
Rick Staples, '75 Eleganza, Johnstown, CO
"Advice is a dangerous gift, even from the Wise to the Wise, and all paths may run ill." -Tolkien
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| Re: [GMCnet] Legality of a hydraulic parking brake [message #358657 is a reply to message #350843] |
Tue, 15 September 2020 07:49 |
Kerry
Messages: 11
Registered: July 2012
Location: Harvest, Al
Karma: -2
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Junior Member |
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Tom, once again you have applied your very competent and through engineering skills to an issue.
Sadly however, your comments about the KISS brake miss the mark. You apparently FAILED to read the many times I posted that the KISS brake (which is not now or ever was sold) is an EMERGENCY brake designed to hold your coach stationary until it could be properly secured with a block, chain, nearby Honda bumper, tree, etc. It is not, was not, was never intended to be a parking brake. Again, this was mentioned MANY times.
The KISS brake was only intended to be used when your coach was on a slope where you did not want to risk the parking pawl failing in the transmission. You can put the KISS brake on and leave the drivers seat to throw a block behind the tire. Hard to do that alone.
I agree with you that keeping the pressure on the brake system is not a good thing 24/7 but I NEVER said or implied that. The KISS brake was designed to temporarily replace the drivers foot on the brake. In that regard, I see no problem and tremendous benefit for a $10 investment. I'm not an engineer but don't see a problem with it being used in that context. Leaving on longer than a drivers leg would hold out COULD be a problem as you describe.
Kerry
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