CRG Discussion Forum
Welcome, Guest. Please login or register.
Did you miss your activation email?
July 23, 2014, 03:23:25 PM

Login with username, password and session length
Search:     Advanced search
Welcome to the CRG Discussion Forum!
Forum registration problems: Make sure you enter your email correctly and you check your spam box first. *Then* email KurtS2@gmail for help.
102304 Posts in 12074 Topics by 4661 Members
Latest Member: 23bull
* Home Help Search Login Register
+  CRG Discussion Forum
|-+  Model Specific Discussions
| |-+  Trans-Am Camaros
| | |-+  JL8 / J56 4-wheel disc racing brakes
« previous next »
Pages: [1] Print
Author Topic: JL8 / J56 4-wheel disc racing brakes  (Read 907 times)
Jon Mello
CRG Member
*****
Posts: 3119



View Profile
« on: May 04, 2013, 05:30:19 PM »

Beginning in the 1968 racing season, the Camaro was homologated (passed the criteria for acceptance) with the SCCA to be able
to use a 4-wheel disc brake package in Trans-Am and A-Sedan events. This brake equipment was adapted primarily from already
existing Corvette brake components. The calipers were the cast iron Delco-Moraine Corvette units and these were the heavier duty
J56 pieces that had 3/4" thick heat insulators on the brake pistons and that used two cotter pins to retain the brake pads rather
than the single pin in the middle. The top of the caliper was milled down to remove the single pin boss because it interfered with
the top of the flanged brake pads and was unnecessary. The inner half of the front calipers had a single brake hose inlet boss where
Corvettes (typically) had two bosses. Here are some of the rare front calipers from Robert Lodewyk's collection.
« Last Edit: May 05, 2013, 12:25:22 AM by Jon Mello » Logged

Jon Mello
CRG
Jon Mello
CRG Member
*****
Posts: 3119



View Profile
« Reply #1 on: May 04, 2013, 05:35:08 PM »

Another photo of Robert's calipers.
Logged

Jon Mello
CRG
Jon Mello
CRG Member
*****
Posts: 3119



View Profile
« Reply #2 on: May 04, 2013, 05:38:19 PM »

Closer view from the top.
Logged

Jon Mello
CRG
Jon Mello
CRG Member
*****
Posts: 3119



View Profile
« Reply #3 on: May 04, 2013, 05:50:44 PM »

A look at the 3/4" thick J56 brake pistons outside the bore of the caliper. (Jon Mello Collection)
Logged

Jon Mello
CRG
Jon Mello
CRG Member
*****
Posts: 3119



View Profile
« Reply #4 on: May 04, 2013, 05:52:24 PM »

A view of the insulator removed from the metal part of the piston. (Jon Mello Collection)
Logged

Jon Mello
CRG
Jon Mello
CRG Member
*****
Posts: 3119



View Profile
« Reply #5 on: May 04, 2013, 05:55:30 PM »

A comparison of the '66 and early '67 Corvette J56 piston with its 3/16" insulator in comparison with the part that superceded it. (Robert Lodewyk photo)
Logged

Jon Mello
CRG
Jon Mello
CRG Member
*****
Posts: 3119



View Profile
« Reply #6 on: May 05, 2013, 01:03:32 AM »

The piston bores in the Camaro and Corvette calipers are the same size They both use a 1-7/8" (1.875") piston.
Logged

Jon Mello
CRG
Pages: [1] Print 
« previous next »
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2013, Simple Machines Valid XHTML 1.0! Valid CSS!
Page created in 0.086 seconds with 18 queries.