80 mm caliper

T

terry skinner

New member
Dec 30, 1998
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[Admin note - Terry, another HTML encoded post. Pat]

I was looking at the 80 mm caliper on
http://www.gmcmotorhome.com/commodore/front_brake/index.html
Where does this caliper come from? Does it work well? I am not into
changes just for the sake of change, but it looks good. Old saying from
Alaska Airlines days. " If it an't broke, don't fix it."

Terry & Diane Skinner
Web-footed in Washington
'76 Glenbrook
 
Frank:

At that price, you better buy all the caliper's you can afford and then go
into business selling them!!!!!!

Paul Bartz

- -----Original Message-----
From: Frank Folkmann [mailto:fmfolkmann]
Sent: Thursday, January 28, 1999 2:11 PM
Subject: Re: GMC: 80 mm caliper

Terry.
I am changing to 80mm. The best price is at AUTO ZONE Part #90184 and #90185
$12.99 plus core. These are remanufactured in Canada. Have a liftime
Waranty?..............FRANK
From: "Terry & Skinner"
Subject: GMC: 80 mm caliper
Date: Thu, 28 Jan 1999 06:55:04 -0800
I was looking at the 80 mm caliper on
http://www.gmcmotorhome.com/commodore/front_brake/index.html
Where does this caliper come from? Does it work well? I am not into changes
just for the sake of change, but it looks good. Old saying from Alaska
Airlines days. " If it an't broke, don't fix it."
 
Emery,

We did the larger wheel cylinder on the front rear bogie wheels a while
back. We added the larger front calipers during the frame off. We are
still using the standard size master cylinder. IIRC, the two reservoirs of
the master might be separated, so an "upgrade" to the front shouldn't
affect an "upgrade" to the rear as far as the master is concerned. We
haven't had any problems so far (~14,000-15,000 miles). We have good shoes
on the rears and put on new Performance Friction pads with the front
calipers though, so I can't say what will happen when the brakes wear down.
If past wear rates are any indication (very slow), it will be a long time
before we find out.

Zak

>Wouldn't the use of a larger caliper require the use of a larger capacity
>master cylinder? I understand the idea is to get more pressure on the front
>brakes but this combined with the use of a 1-1/16" wheel cylinder on the
front
>rear axle might be exceeding the capacity of the standard master cylinder. I
>have done the rear wheel cylinders and am thinking of doing the front
>calipers. Would any of you that have done this please advise as to what you
>did with the master cylinder.
>
>Emery Stora
>77 Kingsley
>Santa Fe, NM
>
 
Wouldn't the use of a larger caliper require the use of a larger
>capacity
>master cylinder? I understand the idea is to get more pressure on the
>front
>brakes but this combined with the use of a 1-1/16" wheel cylinder on
>the front
>rear axle might be exceeding the capacity of the standard master
>cylinder. I
>have done the rear wheel cylinders and am thinking of doing the front
>calipers. Would any of you that have done this please advise as to
>what you
>did with the master cylinder.

I had the larger calipers and wheel cylinders installed on my coach about
5 years ago and when I finally had to replace the master cylinder it was
with the standard model. I have great braking; even before the changes
ere made I had great braking.

David Lee Greenberg F22009
GMC Motorhome Registry
200 MacFarlane Drive PH4
Delray Beach, FL 33483-6829
 
Zak, I don't think the wear will have any effect as long as the backs
adjust and you add fluid to the reservoir to compensate for the wear.
Ted Schurman
73 Glacier VA

>
> Emery,
>
> We did the larger wheel cylinder on the front rear bogie wheels a while
> back. We added the larger front calipers during the frame off. We are
> still using the standard size master cylinder. IIRC, the two reservoirs of
> the master might be separated, so an "upgrade" to the front shouldn't
> affect an "upgrade" to the rear as far as the master is concerned. We
> haven't had any problems so far (~14,000-15,000 miles). We have good shoes
> on the rears and put on new Performance Friction pads with the front
> calipers though, so I can't say what will happen when the brakes wear down.
> If past wear rates are any indication (very slow), it will be a long time
> before we find out.
>
> Zak
>

> >Wouldn't the use of a larger caliper require the use of a larger capacity
> >master cylinder? I understand the idea is to get more pressure on the front
> >brakes but this combined with the use of a 1-1/16" wheel cylinder on the
> front
> >rear axle might be exceeding the capacity of the standard master cylinder. I
> >have done the rear wheel cylinders and am thinking of doing the front
> >calipers. Would any of you that have done this please advise as to what you
> >did with the master cylinder.
> >
> >Emery Stora
> >77 Kingsley
> >Santa Fe, NM
> >
 
Frank:

I called local Autozone and got same price as you quote. However, when I
asked them to give me the GM part number all they could give is a "C"
number, which I gather is another supplier.

Question I have for you is how do you know that the numbers you give are for
the right caliper? GM numbers are 18015385 left side, and 18015386 for the
right side. I also have NAPA and Wagner equivalent numbers.

Paul

From: Frank Folkmann [mailto:fmfolkmann]
Sent: Thursday, January 28, 1999 6:24 PM
Subject: RE: GMC: 80 mm caliper

Paul. I could hardly beleive it myself. Checked 5 local suppliers and
that's Auto Zones price $12.99.............Frank

From: "Bartz, Paul"
Subject: RE: GMC: 80 mm caliper
Date: Thu, 28 Jan 1999 15:41:27 -0500

Frank:

At that price, you better buy all the caliper's you can afford and then go
into business selling them!!!!!!

From: Frank Folkmann [mailto:fmfolkmann]
Sent: Thursday, January 28, 1999 2:11 PM
Subject: Re: GMC: 80 mm caliper

Terry.
I am changing to 80mm. The best price is at AUTO ZONE Part #90184 and #90185
$12.99 plus core. These are remanufactured in Canada. Have a liftime
Warranty?..............FRANK

From: "Terry & Skinner"
 
Frank:

You say "drum brakes"??? Thought we were talking disc drakes??

Bobby had a slight relapse last Sat. He was due to see the doctor
yesterday.

Paul

- -----Original Message-----
From: Frank Folkmann [mailto:fmfolkmann]
Sent: Friday, January 29, 1999 12:10 PM
To: gmcmotorhome
Subject: RE: GMC: 80 mm caliper

Paul.


The calipers are from a Chev 1985? 3/4 and 1 ton with the 13" rear
drum brakes. The origional info came from Arch. He gave me Napa #. I
just went from there and ended up with the Autozone #. If my information
is wrong please let me know.............Frank Going to call Bobby
Sunday to check if we can do machine work on my disc brake conversion

>From: "Bartz, Paul"
>To: "'gmcmotorhome'"
>Subject: RE: GMC: 80 mm caliper
>Date: Fri, 29 Jan 1999 11:15:59 -0500
>Reply-To: gmcmotorhome
>
>Frank:
>
>I called local Autozone and got same price as you quote. However, when
I
>asked them to give me the GM part number all they could give is a "C"
>number, which I gather is another supplier.
>
>Question I have for you is how do you know that the numbers you give
are for
>the right caliper? GM numbers are 18015385 left side, and 18015386 for
the
>right side. I also have NAPA and Wagner equivalent numbers.
>
> Paul
>
>From: Frank Folkmann [mailto:fmfolkmann]
>Sent: Thursday, January 28, 1999 6:24 PM
>Subject: RE: GMC: 80 mm caliper
>
>Paul. I could hardly beleive it myself. Checked 5 local suppliers and
>that's Auto Zones price $12.99.............Frank
>
>From: "Bartz, Paul"
>Subject: RE: GMC: 80 mm caliper
>Date: Thu, 28 Jan 1999 15:41:27 -0500
>
>Frank:
>
>At that price, you better buy all the caliper's you can afford and then
go
>into business selling them!!!!!!
>
>From: Frank Folkmann [mailto:fmfolkmann]
>Sent: Thursday, January 28, 1999 2:11 PM
>Subject: Re: GMC: 80 mm caliper
>
>Terry.
>I am changing to 80mm. The best price is at AUTO ZONE Part #90184 and
#90185
>$12.99 plus core. These are remanufactured in Canada. Have a liftime
>Warranty?..............FRANK
>
>From: "Terry & Skinner" Subject: GMC: 80 mm caliper
>Date: Thu, 28 Jan 1999 06:55:04 -0800
>
>I was looking at the 80 mm caliper on
>http://www.gmcmotorhome.com/commodore/front_brake/index.html
>Where does this caliper come from? Does it work well? I am not into
changes
>just for the sake of change, but it looks good. Old saying from Alaska
>Airlines days. " If it an't broke, don't fix it."
>
>

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