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| 80mm Brakes for 73 Revcon [message #60688] |
Mon, 19 October 2009 14:05  |
rowing guy
Messages: 31
Registered: October 2009
Location: Outside Philly
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Hey Folks,
So, while I don't have a GMC, I will have something close, a 73 Revcon aka as a Flatnose. As I'm sure you know it has the 455 Oldsmobile Toronado FWD system and I want to upgrade to the 80mm brakes. One bit of history is that it has been sitting for a very long time and several mechanic friends recommended I replace the calipers, rear brake cylinders and hoses, so the fun begins.
My question is of the parts below, are they all for the same vehicle (84 Chevy p/u) or are they a hodgepodge from a variety of different sources? The part numbers below are no longer good at Autozone and I wanted to go to Advanced Auto Parts anyway as I have several coupons that could add up to some nice savings. Is there a listing of other part numbers or what the vehicle the parts come from? I'm not sure how to order these parts from Advanced.
Scott
80 MM Front Brake Caliper Upgrade
80 mm Caliper numbersJim Wagner suggested the 84 1/2t 2wd Suburban with JB7, JD7 brakes.
1984 CHEVROLET TRUCK C20 3/4 TON P/U 2WD WITH JB7, JD7 BRAKE SYSTEM
ken
--------------Parts needed to change over to 80 mm caliper's on the front wheels are Autozone and are as follows:
2 ea Banjo bolt, p/n 313940, $1.99
1 ea Caliper, left side, p/n 90185, $12.99 + core charge ($17.00)
1 ea right side, p/n 90184, price same as above
4 ea Caliper mounting bolt, p/n H5004, $1.29
1 ea Brake pad set, p/n 1534, $37.99 (these are Performance Friction carbon metallic pads)
1 ea Flexible hose, left side, p/n 77320, $24.99,Wagner F110424,NAPA 38563-702
1 ea right side, p/n 77421, price same as above,Wagner F110425,NAPA 36954-726
For the brake hoses, try Raybestos # BH38563 & BH36954. You will need two
5/8 national fine jam nuts to attach the hoses to the bracket at the frame.
You will have to slightly alter and move the bracket that is in the middle
of the hose. The steel tube end that fastens to the caliper will have to be
bent a little to clear the upper ball joint.Denny
2 ea bracket clip, p/n H1457, $1.29
2 ea jam nut (don't have AutoZone number for this)
2 ea bolt and nut, ss, ¼ x 1" (not an AutoZone item)
One of the benefits of going with an 80 mm caliper is it applies, I'm told, approximately 1000 psi more braking force vs. original caliper. The difference is noticeable.
Although there was some degree of controversy on this subject a number of months back, you may want to consider going to a larger master cylinder if making the switch to larger the calipers. If so, it's available from
Autozone, p/n 10166, $53.43, and does require an ~ 0.010" longer brake rod (p/n GM 5469384)(between master cylinder and brake booster) as well as a modified mounting bracket. If you need further details on this
modification, let me know. Paul Bartz
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