J56 disc pads w/THICKER backing ? [eBay]

[Wayne M.]

I always thought that there was only one heavy duty dual pin front brake pad design, Gr 5.017 #5468882, until I saw these 2 sets sell on eBay; part # 5470991 with friction material stencilled 5471145. (link below; check thumbnails of close-up and compare with autoload pic below of my pads.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=010&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=200068698560&rd=1&rd=1

They are described as having a thicker backing than the thinner dual pin design. What did the C3 Z07(?) use, and did it include HD brakes ?

The backing plates on my pads shown below are exactly 1/8" (0.125") and the plate plus friction material is 0.530".

[Joe L.]

Re: J56 disc pads w/THICKER backing ? [eBay]

Wayne-----

There were a total of FOUR different J-56 HD front brake pad designs, only 3 of which were ever used in PRODUCTION. 1966 with J-56 (as well as any 1965 built with J-56) used front pads GM #5452514. I believe that these pads MAY have used a riveted friction material and I believe the backing plates were steel.

1967-68 used pads GM #5463160. I do know not what the configuration of these pads was. These pads also became the SERVICE pads for 65-66 when the 5452514 were discontinued in July, 1967.

1969-75 (which does include 1973-75 with Z-07) used pads GM #5468882. These pads are, of course, as you have pictured. These became the SERVICE pads for all 1965-68 J-56 applications when the 5463160 were discontinued in December, 1968.

The GM #54709991 were a SERVICE-only pad that first became available in late 1971. They were never used for any PRODUCTION J-56 application but were designed for off-road racing activities. While the backing plates of these pads were thicker than the standard J-56, I don't think that the increased thickness was very great although I don't have specs for them. They were discontinued from SERVICE in July, 1983.

[Lyndon S.]

Re: J56 disc pads w/THICKER backing ? [eBay]

Joe

if one has the J56 HD brakes, then other than NOS pads where can one buy pads for the J56 brake set up? Any one other than NOS Delco pads in the market?

[Joe L.]

Re: J56 disc pads w/THICKER backing ? [eBay]

Kelly-----

I don't know of a source for the J-56 configuration front pads. There are at least a few companies that will reline existing backing plates, but I don't know of any that currently supply the complete pad assembly.

[Howard Nardick]

Re: J56 disc pads w/THICKER backing ? [eBay]

I get "L shaped" pads custom made (.750 thick) for my vintage racer but they are probably not made with a street friendly friction material, you might try ex Corvette racer Andy Porterfield (Porterfield brakes) in CA.

...HN

[Lyndon S.]

Re: J56 disc pads w/THICKER backing ? [eBay]

I went to the vette brake web-site and they have the J56 pads for 89.00, of course not delco. I was just wanted to know what to do for pads with out nos delco.

[Wayne M.]

Joe -- thx for detailed chronology; two more Q's

after reading your post, I checked in my 1967 (Oct 1966) first issue of the Chevrolet P & A 30. (I had previously checked issues July 1965, Oct '65, but found no reference to a HD part #, although the '66 catalog describes the standard brake pads as (exc. H.D.) -- weird, huh ? Therefore I erroneously concluded that 5468882 was the first isssue for the front HD pads.

In the 1967 catalog it shows your first # 5452514 with (bonded) after the description as applying to 1965 and 1966 MY. For 1967, the second number 5463160 has no bonded comment.

If the thick backing plate 5470991 were service / racing only, does this mean it would not appear in a P & A 30 catalog ?

Do you have a discontinued date for the 5468882 ?

[Joe L.]

Re: Joe -- thx for detailed chronology; two more Q

Wayne-----

While the catalog does show the 5452514 to be "bonded", I'm not completely sure that's accurate. Somewhere along the way, I heard/read/? that one of the J-56 front pads were riveted and not bonded. I know it's not the 5468882 or the 5470991. So, assuming that any of these pads were actually riveted, it would have to be either the 5452514 or the 5463160.

Since the 5470991 was not a regular SERVICE part for a PRODUCTION application, it would not (and, did not) appear in the P&A 30 catalog. It would appear only in separate, "hi performance service parts" catalogs or bulletins sent to dealers.

The GM #5468882 was discontinued in July, 1987.