Russ:
The parts you are looking for, backing plate primarily, comes from the
76-78 Cadillac El Dorado REAR AXLE ONLY. There is some machine work
required to enlarge the center opening so that it will fit over the
coach axle and butt up to the arm.
Bobby Moore from Louisville KY (502-964-6416) gave a seminar on use of
the backing plates at the New Hampshire GMC MI Rally last September.
His handout had all the information on what components to obtain and the
required machining to have done. Using a rebuilt P-30 chassis master
cylinder and 2-1/2" calipers, machining, etc., the system would cost
approximately $2100 to do the four rear wheels.
The El Dorado calipers have a lever arm to connect the emergency brake
cable to. Bobby connected and tested his on one axle only and found
that it wouldn't hold on a steep incline. An alternative is a hydraulic
line lock installed in the brake line, activated electrically by a
switch.
Paul Bartz
> -----Original Message-----
> From: Marcus McGee [SMTP:crsalert]
> Sent: Tuesday, April 28, 1998 7:40 PM
> To: gmcmotorhome
> Subject: Re: GMC: Rear disc brakes
>
>
> I would like to know what vehicle(s) in the salvage yards would work
> as donors for a set of rear disc brakes for my 1976 Glenbrook. I
> think that El Dorado rear calipers and backing plates is what I need.
> I was out to one of the local salvage yards the other day and they
> seem to have several possible donors. I need to check out my rear
> brakes and thought I would start gathering up parts to convert to disc
> on all 6 wheels this winter.
>
> Russ Bethel
> San Antonio, Texas
>
> Russ:
>
> I do not think it is that simple. The mounting arrangement is quite
> different. Try looking at the Western States Web site. There is a
> company in Colorado that will do the discs and let you get the
> calipers etc. The disc set up was about $40 or less with out the
> calipers.
>
> Marcus
