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Lenzi mid axle brakes with True-Track [message #362217]

Fri, 05 February 2021 07:42

RF_Burns

Messages: 2276
Registered: June 2008
Location: S. Ontario, Canada

Karma: 3

Senior Member

I currently had a True-Track on my mid axles only.

I also have Dave Lenzi's mid-axle disc brake kit I'd like to install. I've had the kit for a couple of years and when I got it I believe Dave said he had not looked into making a bracket for the True-Track.

Before I get into this installation, has anyone adapted the True-track to work with Dave's mid-axle brakes?

Thanks

Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

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Re: Lenzi mid axle brakes with True-Track [message #362220 is a reply to message #362217]

Fri, 05 February 2021 10:53

SteveW

Messages: 538
Registered: June 2005
Location: Southern California - Ora...

Karma: 1

Senior Member

Thanks Bruce !!

I have EXACTLY the same issue... haven’t purchased Dave’s kit yet but planning to.

Steve W
Southern California

Steve W 1973 : 23' Southern California

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Re: Lenzi mid axle brakes with True-Track [message #362228 is a reply to message #362220]

Fri, 05 February 2021 13:50

Bill Van Vlack

Messages: 419
Registered: September 2015
Location: Guemes Island, Washington

Karma: 14

Senior Member

Seems like Dave's kit adds the thickness of the adapter/backplate assembly to the back of the bogie mount where the true-track would attach. Since the bracket that holds the roller is designed to mount directly to the back of the bogie mount, it would need to be modified so that it could be mounted further away from the bogie mount by that thickness. Would probably need longer bolts. From the true-track photos it looks like it would clear the true-track guides.

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: Lenzi mid axle brakes with True-Track [message #362242 is a reply to message #362217]

Fri, 05 February 2021 18:36

RF_Burns

Messages: 2276
Registered: June 2008
Location: S. Ontario, Canada

Karma: 3

Senior Member

So I was able to pull the passenger mid wheel off late this afternoon and make some measurements. Please note these are not really accurate measurements, there is likely an uncertainty of 1/4".

The distance from the back of the bogie to the frame is ~5.75". The True-Track channel is made from two 2" OD U channels for a total width of 4", so that leaves 1.75" of clearance.

The spacer and caliper mounting bracket is 1.1". The caliper extends 2" beyond the mounting bracket so that is 3.1" where there is only 1.75" to the true-Track channel. So the channel would need to be removed from its present position.

I'll need to get the brakes mounted to see what I can do. I can see where the slider track version would likely clear, but I haven't seen that version on JimK's site. I'm guessing its no longer available?

Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

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Re: Lenzi mid axle brakes with True-Track [message #362256 is a reply to message #362217]

Sun, 07 February 2021 07:54

RF_Burns

Messages: 2276
Registered: June 2008
Location: S. Ontario, Canada

Karma: 3

Senior Member

I started my installation of the Lenzi mid-axle brakes yesterday. I posted some photos including the clearance from the mounting bracket to the Tru-Track channel. The Tru-Tracks need to come off as there is only about 3/4" clearance behind the caliper mounting bracket. The Lenzi brake system needs about 2".

I really like the Tru-Tracks on the mid-axle. I believe they cut down on rear sway and made it easier to pull back on the pavement when the rear went on the gravel shoulder. Just my experience.

http://www.gmcmhphotos.com/photos/g7345-lenzi-mid-axle-disk-brake-upgrade.html

Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

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Re: Lenzi mid axle brakes with True-Track [message #362276 is a reply to message #362256]

Sun, 07 February 2021 16:27

78 Barbi

Messages: 80
Registered: August 2004
Location: Tiverton, Ontario , Canad...

Karma: -1

Member

Bruce H writes : I really like the Tru-Tracks on the mid-axle. I believe they cut down on rear sway, Bruce ; something to ponder, Karl down in NC and myself are having a quantity of 1" dia. sway bars produced to be used with our reaction arm braking system using the 80mm Lambke forked caliper mount and the Kelsey Hayes ball ramp parking brake caliper . Since the sway bars have a horizontal axis eye, one might be able to mount an adapter to the rear axis of the mid bogie arm and couple it with a semi flexible joint to the sway bar. This approach would give you a quasi " Tru Track " and a mid sway bar. Cheers .......Albert
78 Barbi
The 23 foot Birchaven
Tiverton ON

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Re: Lenzi mid axle brakes with True-Track [message #362330 is a reply to message #362217]

Thu, 11 February 2021 00:21

SteveW

Messages: 538
Registered: June 2005
Location: Southern California - Ora...

Karma: 1

Senior Member

Thanks for posting pictures Bruce !!

I’m still planning to do this on my 23 footer and remain curious about your true-track solution...

And another issue - I don’t know if my 1973 coach ever received the bogie pin upgrade of it it still has the original (smaller diameter) pins.

Anyone have a method for discovery other than dis-assembly ??

Thanks,
Steve W

Steve W 1973 : 23' Southern California

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Re: Lenzi mid axle brakes with True-Track [message #362331 is a reply to message #362217]

Thu, 11 February 2021 04:47

RF_Burns

Messages: 2276
Registered: June 2008
Location: S. Ontario, Canada

Karma: 3

Senior Member

Steve,
At this point my solution is to remove them. Dave said a solution is something he needs to work on as a number of people have asked him about it.

I've sent him some photos with measurements.

I have some more photos to post on the site of the installation... maybe I'll get that done this morning yet.

Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

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Re: Lenzi mid axle brakes with True-Track [message #362333 is a reply to message #362331]

Thu, 11 February 2021 07:38

lqqkatjon

Messages: 2324
Registered: October 2010
Location: St. Cloud, MN

Karma: 5

Senior Member

Bruce,

What are you running for a front sway bar??

I have a couple people tell me their caspro front bars are enough to allow them to jump on and off the edge of pavement stress free. I am planning on driving their coach this summer to see for myself. a heavy front bar is something I would like to do soon.

Jon Roche 75 palm beach EBL EFI, manny headers, Micro Level, rebuilt most of coach now. St. Cloud, MN http://lqqkatjon.blogspot.com/

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Re: Lenzi mid axle brakes with True-Track [message #362334 is a reply to message #362217]

Thu, 11 February 2021 08:36

RF_Burns

Messages: 2276
Registered: June 2008
Location: S. Ontario, Canada

Karma: 3

Senior Member

I know some who run the rear (mid) torsion bars have said that. But I have also heard it said that the rear torsion bars can make it harder to level the coach due to the torsion bar action side to side.

Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

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Re: Lenzi mid axle brakes with True-Track [message #370505 is a reply to message #362217]

Thu, 15 September 2022 11:26

SteveW

Messages: 538
Registered: June 2005
Location: Southern California - Ora...

Karma: 1

Senior Member

Greetings from Southern California !

Resurrecting this thread as I remain interested in Dave's mid-wheel braking system and true-tracks...

And - since my last posting long ago - I've retired - so this project may finally get some action.

Any news on true-track adaptability ??

Does Dave's kit now include a parking brake caliper too ??

Thank you all for your contributions to this wonderful community.

Steve W

Steve W 1973 : 23' Southern California

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Re: Lenzi mid axle brakes with True-Track [message #370506 is a reply to message #370505]

Thu, 15 September 2022 21:44

Carl S.

Messages: 4186
Registered: January 2009
Location: Tucson, AZ.

Karma: 13

Senior Member

Congratulations on retirement Steve! Isn't it great???!!!

Carl Stouffer '75 ex Palm Beach Tucson, AZ. Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member

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Re: Lenzi mid axle brakes with True-Track [message #370508 is a reply to message #362217]

Fri, 16 September 2022 07:43

RF_Burns

Messages: 2276
Registered: June 2008
Location: S. Ontario, Canada

Karma: 3

Senior Member

Steve W,
Dave's mid-axle brakes has a mounting point for a small caliper to be a parking brake. The last info I had was it will be hydraulic with a small spring-loaded master cylinder to operate it.

I don't have any info as to whether it works as required or whether it would pass regulations as a legal parking braking.

I have just installed an Electronic Parking Brake (EPB) system designed by Albert Branscombe. It has held on any incline I've been able to test it on. Next week we plan on officially testing it on a 15% grade. I'll let you know how that goes.

Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

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Re: Lenzi mid axle brakes with True-Track [message #370511 is a reply to message #362217]

Fri, 16 September 2022 10:18

SteveW

Messages: 538
Registered: June 2005
Location: Southern California - Ora...

Karma: 1

Senior Member

Thank you Carl. Yes - retirement certainly is wonderful. I’m discovering tons of incomplete projects around here. How could that be ???

Bruce - yes - I saw that. I’m keenly interested. And I’m disappointed that I didn’t purchase one of Alberts kits when they were available.

All good in Southern California,
Steve W

Steve W 1973 : 23' Southern California

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Re: Lenzi mid axle brakes with True-Track [message #370513 is a reply to message #370511]

Fri, 16 September 2022 20:49

Carl S.

Messages: 4186
Registered: January 2009
Location: Tucson, AZ.

Karma: 13

Senior Member

SteveW wrote on Fri, 16 September 2022 08:18

Thank you Carl. Yes - retirement certainly is wonderful. I’m discovering tons of incomplete projects around here. How could that be ???

All good in Southern California,
Steve W

It also gives you more time to harass people about their wheels! Twisted Evil

Twisted Evil

Rolling Eyes

Carl Stouffer '75 ex Palm Beach Tucson, AZ. Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member

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