Restoration

Despite volumes written about the legendary prowess of '60s musclecars, the legends always seem to gloss over some serious engineering shortcomings of the era. Brake packages were often, in a word, terrifying. One good shot was most of what you got if you were lucky. After that it was white-knuckle time when it came to stopping fast and that was with a powerplant kicking out factory horsepower. Brake fade was the name of the game. Add a cam, some carb, headers and exhaust, and stopping becomes even more elusive. While drum brakes are great for stopping lumbering buses and dump trucks, they're no good for gas-huffing musclecars.

Quick Stop
The good news is that it's never been easier to upgrade your '60s- or '70s-era GM musclecar to a disc brake package. Stepping up to serious stopping power with disc brakes on all four corners is as easy as picking up the phone, opening a box, and spending an afternoon under the car spinning wrenches. While upgrading the front brakes is usually a simple matter of a spindle swap, working out back requires removal of the rear axles in order to get down far enough to remove the drum backing plates. The perfect time to upgrade is when you have to service the bearings, axles, or rear gears. Pulling that brake drum off and discovering that gear oil has glazed over your brake shoes like a day old donut might be a good time to switch rather than fight.

Plan of Attack
Upgrading or reconfiguring any stock braking system requires a methodical system approach, and attention to detail. Bolting up a brake kit without taking into account the condition of the entire system from master cylinder to bleed screw may be the last mistake you ever make. Spanky new calipers and rotors won't help if connected to ancient brake lines, spent fluid, and a spongy master cylinder. When upgrading to discs on the corners, don't forget to inspect and replace lines if required. Adding an adjustable proportioning valve while the hydraulic system is apart is also a good idea, and will allow for tuning of the front to rear braking ratio after everything is buttoned up. Life absent of unexpected sideways braking is always a good thing.

Resource
GStainless Steel Brake Corp., 11470 Main Road, Clarence, NY 14031, 800-448-7722, www.ssbrakes.com


Classic Tube, 80 Rotech Drive, Lancaster, NY 14086, 800-882-3711, www.classictube.com


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Photo Guide

Back the brakes all the way down to the backing plate. Remove the rear differential cover to drain the gear oil and access c-clips. Remove the c-clip cross shaft retaining bolt. You love the smell of gear oil!

Push in the axle slightly, and turn the carrier over by hand to remove the c-clips. A magnet makes it easy. Remove the axles being careful not to damage the seals. Remove the backing plates.

Install the caliper mounting plate. Orient the plate depending on the ultimate position of the calipers. Cinch it down to the flange.

Insert the bolts and spacers through the mounting plate. Mount and fasten the caliper-mounting bracket to the mounting plate.

Torque all fasteners to the recommended values!

Load up the calipers on the bench. Tabs may need to be bent slightly for a proper fit.

Slide the axle back in slowly and push it in to allow reinstallation of the c-clips, cross shaft, and retaining bolt.

Replace the c-clips. Line up the cross-shaft retaining bolt before pushing it into place. Fasten the retaining bolt.

Throw on the disc, and fit the caliper to line up the holes for the mounting bolts.

Thread the mounting bolts through and cinch down the loaded caliper assembly.

The stock brake hard line was shortened up for a better install of the braided stainless steel flexible line.

Always use new copper washers when installing or replacing brake lines. The washers are designed to seal only once

Fasten up the flexible line to the hard line. Use line wrenches to prevent round bolts and excessive swearing.

An adjustable proportioning valve is an indispensable item when it comes to getting the front-to-rear braking ratio dialed in.

Double check all brake line fittings and mounting fasteners before adding brake fluid. Bleed the system and check everything again. Enjoy newfound braking power.



Related Articles
Classic GM Alternator Restoration
Aftermarket Disc Brake Install
Fuel & Brake Line Installation
Drum Brake Restoration
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