Home » Public Forums » GMCnet » Drum brakes
| Re: [GMCnet] Drum brakes [message #329044 is a reply to message #329043] |
Sat, 10 February 2018 17:31   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
|
Senior Member |
|
|
The best non factory emergency/parking brake I have seen on a coach was on
Chuck Algur's coach. It consisted of two triangular rubber blocks connected
by a right hand/left hand threaded electric actuator. It was installed
between the two rear tires vertically with the small ends of the triangles
facing towards each other. When the actuator operated, the blocks either
came closer to each other or further apart. When they came towards each
other, they wedged into the two rear tires, effectively preventing them
from moving. When I talked to Chuck about the setup, it was at the Western
States Rally at Auburn, California, and his system was in the prototype
stage. He said that it worked well as a parking brake, but he was working
out the best angle for the emergency brake function. He became Ill shortly
after that rally. I don't know if he ever fully developed the system or
not. You could not move the coach with the engine when it was set while
parked. Kinda like electric wheel chocks.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Feb 10, 2018 2:19 PM, "Rob Mueller" wrote:
> Tom,
>
> "Ask Rob Mueller about his run away coach experience."
>
> I don't remember a run away coach experience. I did have a P-10 master
> cylinder fail on our first tour but it was at low speed and I
> was able to stop the coach and fix the problem by replacing the master
> cylinder.
>
> Double Trouble came with 6 wheel disks; OEM on the front, Caddy disks on
> the middle / rear; and no parking / emergency brake. In
> order to pass NJ inspection I had Ken Frey swap the rear disks for drums,
> hook up the cables, and install rebuilt 80mm calipers on
> the front and middle calipers. I have been quite happy with the way it
> stops. So much so that's the braking system the Kingsley will
> run.
>
> The day before I took Double Trouble for inspection I adjusted the shoes
> and the brake cables and adjusted the knob on the end of
> the brake lever to put the max tension on the cables. I watched the
> inspector strain to pull the parking brake on before he ran the
> test and was very happy when it passed.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of
> Thomas Pryor
> Sent: Sunday, February 11, 2018 7:51 AM
> To: gmclist@list.gmcnet.org
> Subject: Re: [GMCnet] Drum brakes
>
> Yeah, its me again the guy that brings reaction arms to your rear wheels
> without disturbing the hydraulics or the parking brake.
>
> For my coach, a modified 23B that has only been driven about 5000 miles
> mostly to Rapid City, SD and is now up on blocks in my garage here in Lake
> Wales Fl. I am doing more mods and will share in future. Upon my return
> from Rapid City to Florida, I had the fortune ( misfortune) to tailgate
> Uncle Ken Henderson in his 23B with a Cadillac engine and all wheel disc
> brakes and effective but legally questionable "line lock" parking brake.
> Why questionable?.....sustained pressure on brake cylinder seals that were
> designed to see only momentary duty. As Rob Mueller about his run away
> coach experience.
>
> That said, I was mostly able to keep up with him over hill and dale with
> effective braking and acceleration. (note: 120k on my 455 with Caspro
> power drive) My rear brakes were standard drum brakes with no reaction
> arms at the time.
>
> A couple years back when I visited Jim K in Calif I modified one of his
> coaches with the following:
>
>
> - INTERMEDIATE WHEELS were modified to use the GM3 caliper and yellow
> pads. A GM3 caliper is the same 80MM caliper body used on the Front
> wheels
> of our coaches. The intermediate wheel was fitted with a reaction
> arm.
> - The rear wheels were also fitted with a reaction arm but remained as
> stock configuration drum brake.
> - PARKING BRAKE CABLES were modified to include pulleys at all
> junction points. The dual cable that actuates the both rear and
> intermediate brake shoes was abandoned. A new cable extension was
> introduced that ONLY ACTUATES the rear wheel brake shoes.
>
>
> I then tuned the parking brake to eliminate all "LASH" in the cable
> system. I followed a very specific sequence and ended up using a 12"
> extension on the PB lever to get it "OVER THE TOP"............ that
> stretched the cable even more. I then released some tension at the top of
> the parking brake handle to achieve a no drag condition on the rear brake
> shoe. Jim & I then took the coach for a drive and skidded the
> intermediate tire in some aggressive stops. we were both happy with the
> service brake enhancement. note: With the reaction arm the rears skidded
> also.
>
> We then turned our attention to the Parking brake. I instructed Jim to
> engage the parking brake, rock the coach front to rear. He took direction
> well and then proceeded to drive off as many owners do with the parking
> brake engaged. IT TOOK 3000 ENGINE RPM TO MOVE THE COACH. I told Jim at
> the time with the transmission groaning, I could not see how even the
> most inattentive owner could drive without releasing the parking brake.
>
> Alas, I had to catch a plane back to Fl and no further assessment was
> done.
>
> So with my coach being prepared for test launch this summer my Brake system
> will consist of:
>
>
> - new SS brake lines
> - new Proportioning valve
> - swap front to rear brake lines out of Master cylinder
> - Front discs as original with yellow pads
> - Intermediate with front disc calipers and discs.......yellow pads and
> reaction arm.
> - The rears will be stock drums and probably no reaction arm. I will
> not plumb the rear wheel cylinder. The rear drums will function ONLY
> as a
> parking brake. I have located some very aggressive brake shoe material
> intended for aggressive holding power, not for service brakes use.
>
>
> JWID.
>
> BTW, Can anyone "report out" using the Chuck Algaur (sp?) intermediate
> 12" disc system and eliminating the rear drum to be used a parking brake
> only?
>
>
>
>
>
> 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://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
|
|
|
|
Current Time: Thu May 02 22:15:35 CDT 2024
Total time taken to generate the page: 0.00584 seconds
|
GMCforum
Search
Help
Register
Login
Home
