| [GMCnet] Disc Brake Park Brake Again [message #241747] |
Fri, 28 February 2014 08:24  |
Thomas Pryor
Messages: 143
Registered: January 2011
Karma: 1
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Senior Member |
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Gene Fisher wrote:
Then there's always the hydraulic Mico brake lock. But, I didn't find the
> installation instructions to be accurate.
> what did you find wrong?
ANSWER:
The Micro brake lock uses service brake hydraulic pressure to maintain
friction. In Other words, IT IS NOT MECHANICAL It uses the lip seals in
each service brake wheel cylinder to maintain friction. The duty cycle
"limits" of these seals are intermittent in nature and are unreliable for
long duration pressures. in addition, hydraulic brake lines are stressed
and are considered a weak link due to environmental degradation.
--
Regards,
Tom Pryor
4188 Limerick Dr
Lake Wales, Fl 33859
Cell 248 470 9186
Living on a waterfront is not a matter of life or death. Its more
important than that.
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| Re: [GMCnet] Disc Brake Park Brake Again [message #241755 is a reply to message #241747] |
Fri, 28 February 2014 09:34  |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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> Then there's always the hydraulic Mico brake lock. But, I didn't find the
> > installation instructions to be accurate.
> > what did you find wrong?
>
> ANSWER:
> The Micro brake lock uses service brake hydraulic pressure to maintain
> friction. In Other words, IT IS NOT MECHANICAL
this is not a installation instructions problem.
just a conceptual problem
having been a truck driver 1/2 of my life
i would not have a GMC without a brake lock
every truck you see, dump, garbage, ups, delivery---
has a supplementary brake lock system.
something that:
- will lock up all four rear wheels
- will allow you to get out and block the wheels
- draws no power when locked on
- will accumulate peddle pushes when systems fail
*any* mod to the OEM system will make you
- legally liable
- rear wheels only
- brake assists like
-- air assist
-- disk brakes
-- larger pads
-- powered pullers
- mechanical on not
so a supplemental brake assist, is the answer
be safe on
- on ramps
- off ramps
- hills
- time to get out of the seat
and
and
i like disk brakes also,
- no more adjusting every trip
- brakes that work
- more clamping force
- modern technology
- etc, etc,
It uses the lip seals in
> each service brake wheel cylinder to maintain friction. The duty cycle
> "limits" of these seals are intermittent in nature and are unreliable for
> long duration pressures. in addition, hydraulic brake lines are stressed
> and are considered a weak link due to environmental degradation.
>
> nothing will solve these problems
better to save your and your gmc
ask any trucker
erf
>
>
> --
> Regards,
>
> Tom Pryor
> 4188 Limerick Dr
> Lake Wales, Fl 33859
> Cell 248 470 9186
>
> Living on a waterfront is not a matter of life or death. Its more
> important than that.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
"Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: [GMCnet] Disc Brake Park Brake Again [message #242090 is a reply to message #241747] |
Sun, 02 March 2014 20:24 |
 |
WildBill
Messages: 232
Registered: January 2014
Karma: 1
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Senior Member |
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I was just thinking about my Mico lock, if you open up or delete the combination valve function the miko lock with 6 wheel disks you would have to be plumbed to either the front brakes or the rear brakes after the combination or proportioning valve. With opening up the combination valve both sides of the master cylinder are providing pressure to all 6 wheels from my brief look, that's why I will probably modify the combination valve for no restriction to the front but still keep the split system so if I lose pressure on 1/2 the system, well I still have half the system left. Should be a matter of drilling larger holes in the spool for the front and the brake warning light would still work.
my neighbour has a sloped driveway and the master was 2 feet below the back wheels, pressure bled from the back and he freaked when brake fluid started hitting the driveway, ya want brakes? Get a hose out...there is a potential for leaks or the valve not releasing completely when, you start driving, extra gas, burning breaks, just stuff I have seen. Release your miko and you have to rev to 2500 to move you have a problem. I think a Miko lock is great for short term parking, wheel chocks are probably the answer. And Miko lock or the kiss brake will do that, just 2 different application methods.
I agree anything hydraulic is not an emergency brake, don't know how we got to the common terms of park brake or emergency brake. Back up should be something you don't rely on every day. The manny calliper brake, probably not going to slow me down a bunch going down a 12% grade at 75 mph should my hydraulics fail. Mechanical drum emergency brakes are not going to work either if they are to hot to provide much braking. A 3 mile down grade they are going to be hot anyway if the guy doesn't drop to 2nd and use compression braking. Good reason to keep your brake system in top Notch order. Truckers don't have it a whole lot better, usually maxi on one axle so if you lose brakes going down, not going to help much. Only situation is air pressure loss.
When I was younger, I remember driving down icy Edmonton roads.
Sometimes in traffic after driving to fast I would drop it into reverse. Some times at speed punch brakes to accommodate reverse shift just for fun. Loss of hydraulics brakes trany valve body modification certainly possibile to a accommodate reverse valve shifting at speed. But easy to do that, lots of Leo cars were set up like that. Could you destroy your trany in in a 12000 lb vehicle during an unexpected brake loss situation, yes. Could it potentially save your life, maby!
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| Re: [GMCnet] Disc Brake Park Brake Again [message #242104 is a reply to message #242090] |
Sun, 02 March 2014 21:43 |
cbryan
Messages: 451
Registered: May 2012
Location: Ennis, Texas
Karma: 3
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Senior Member |
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Bill,
You Canadians think we are barmy down here! Got to hand it to you for having guts. Shifting into reverse at speed, that's brave for sure. Living through it to teach others is another plus. Icy roads made it possible, I guess.
Ah, to be young and to finish the R&D for the automakers! Don't know if you ever wrote them and asked for a job as test driver. Might ought to have. Maybe the police cars did have that feature, again never heard of it. Hard to get mind around it, actually.
Thanks for helping us. I wonder what Manny Trovao might say about a reverse shift at speed. Well, I don't wonder, really.
Carey
Carey from Ennis, Texas
78 Royale, 500 Cadillac, Rance Baxter EFI.
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| Re: [GMCnet] Disc Brake Park Brake Again [message #242113 is a reply to message #242111] |
Sun, 02 March 2014 23:44 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Senior Member |
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The reverse trick works well in my Subaru awd 5 speed. Just tested it out a few weeks ago in the snow. We have a lot of hills here.
Todd Sullivan
Sully
77 royale
Seattle
> On Mar 2, 2014, at 9:12 PM, Bill Dolinsky <Wildbillnick@yahoo.com> wrote:
>
>
>
> On icy roads you could hold it straight and reduce stop time
> At speed it could throw you In a wild 360 With power on at the right time. Desired result.
> --
> Bill Dolinsky
> Edmonton, Alberta, Canada
> 1977 Kingsley TZE167V102169
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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