| thanks Dave Lenzi [message #365098] |
Tue, 29 June 2021 08:57  |
ebyker
Messages: 37
Registered: May 2016
Karma: 1
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Thank you Dave Lenzi for fixing my brakes I know you hane not been near my coach but your artical in the last GMC vintage rv was the answer .Two years ago I did a major brake rebuild 4 new rear wheel cyls rear shoes ss flex lines new BRASS combination valve new master cyl new sensitied booster new yellow pads ( po had instaled 80 mm calipers ) I spent hours bleeding trying to get good brakes spet time on the phone with Jim k I could not get the rear wheels to lock up . The next winter I converted to a home built hydroboost ( a big improvement )but still no rear lock up . To day I modified the new BRASS combination valve as per Daves instructions went for a Quick road test I can finalay lock the rear wheels thanks Dave
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| Re: thanks Dave Lenzi [message #365100 is a reply to message #365098] |
Tue, 29 June 2021 08:59  |
Tom Katzenberger
Messages: 399
Registered: June 2019
Location: Kingsville, MD
Karma: 4
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Does the new combination valve sold by Applied correct for this or should it be modified as well?
Tom & Oki Katzenberger,
Kingsville, Maryland,
1977 23' Birchaven, 455 C.I.D., Micro Level, Howell EBL-EFI Spark Control, Macerator, York Air Compressor, 6 Wheel Disc, Quadra Bag, Onan W/Bovee Ignition
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| Re: thanks Dave Lenzi [message #365102 is a reply to message #365100] |
Tue, 29 June 2021 09:26 |
Bill Van Vlack
Messages: 419
Registered: September 2015
Location: Guemes Island, Washington
Karma: 14
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I think the only way to be sure is to take one apart or ask Applied.
Bill Van Vlack
'76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath, Brazilian Redwood counter and settee tops,455, 6KW generator; new owner a/o mid November 2015.
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| Re: thanks Dave Lenzi [message #365107 is a reply to message #365098] |
Tue, 29 June 2021 10:32 |
TR 1
Messages: 348
Registered: August 2015
Location: DFW
Karma: -7
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Why are you trying to lock your rear wheels?
Mark S. '73 Painted Desert,
Manny 1 Ton Front End,
Howell Injection,
Leigh Harrison 4bag and Rear Brakes,
Fort Worth, TX
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| Re: thanks Dave Lenzi [message #365113 is a reply to message #365108] |
Tue, 29 June 2021 12:58 |
TR 1
Messages: 348
Registered: August 2015
Location: DFW
Karma: -7
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ebyker wrote on Tue, 29 June 2021 11:21I do not want to ever need to lock the rear wheels I just need to know that in an emergency ( eg dum driver cuts me off )that I have maxinum braking available
But if your backs are locking prematurely, your fronts may not be getting max braking.... And the fronts are responsible for the vast majority of braking force in a panic stop.
My point being make sure your focus is on the fronts... Yes it's good to maximize rear braking, but not at the expense of front braking performance. And if you are locking the backs before the front, you very well may be.
Mark S. '73 Painted Desert,
Manny 1 Ton Front End,
Howell Injection,
Leigh Harrison 4bag and Rear Brakes,
Fort Worth, TX
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| Re: thanks Dave Lenzi [message #365118 is a reply to message #365113] |
Tue, 29 June 2021 13:06 |
Christo
Messages: 109
Registered: April 2019
Location: Weymouth, MA
Karma: 0
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According to Mr. Lenzi, the mid-brakes on a 26' coach deliver comparable braking power to the fronts, unlike on a car. The difference is the length of the coach and the lever action of the front bogie arms.
Christo Darsch
GMC Nor'easters
1977 Eleganza II - "The Komet"
3.50 Power Drive, Disc Brakes, Alcoas
Weymouth, MA
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| [GMCnet] Re: thanks Dave Lenzi [message #365120 is a reply to message #365116] |
Tue, 29 June 2021 13:04 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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True, but if you can't lock them, how do you know you have the braking
capacity to reach that maximum just before lock-up?
Ken "Just barely can" H.
On Tue, Jun 29, 2021 at 1:57 PM James Hupy wrote:
> Sorry to inform you of this, but wheels locked does not represent maximum
> braking effort.
> Jim Hupy
> Salem, Oregon
>
> On Tue, Jun 29, 2021, 9:21 AM Eelko Byker wrote:
>
>> I do not want to ever need to lock the rear wheels I just need to know
>> that in an emergency ( eg dum driver cuts me off )that I have maxinum
>> braking
>> available
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: thanks Dave Lenzi [message #365126 is a reply to message #365122] |
Tue, 29 June 2021 15:18 |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
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Senior Member |
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Lock up or no lock up i can tell you when these brakes are set up and working properly you can make 2 one hundred pound shepards and a ninety pound rotty fly from the back clean to cockpit floor without even a touch of wheel skid.....lol.
Rich Mondor,
Brockville, ON
77 Hughes 2600
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