#8635
V8 Staff
Keymaster

OK. OEM disc brake setups for the second gen Riv are unobtanium. And if you ARE fortunate enough to locate a set of calipers, they are usually about $400 a piece. And finding someone who will rebuild them is difficult and it is about half a grand per caliper. Rotors are also difficult to locate.

So looking to the aftermarket, a company called Scarebird makes a set of caliper brackets. They have redesigned them from their original release, but they still don’t fit as well as I would like. They use rotors from a ’71 – ’76 Riviera and use calipers from an AWD Chevy Astro Van. I think the calipers are a mismatch with the stock master cylinder. The brakes were barely adequate, even after I plumbed in a front hold-off valve and a rear 10 pound residual valve. I even added an adjustable proportioning valve to the rear trying to get more pedal. I’ve lived with it but now I want to see if there is something better.

A Riviera gent in Australia named Tony Gentilcore offers caliper brackets that are worlds above the Scarebird setup. They even use ’71 and later Riviera calipers with the same year rotors. The only catch is that the steering knuckle requires a little bit of clearancing to allow the brackets to fit. I had a shop use a mill to machine my knuckles, but after seeing it all put together, a competent home mechanic can do it with a die grinder.

The calipers are a 2-piece design, which is where the Scarebird brackets fail. The Scarebird brackets are a single piece of steel which really doesn’t fit well. Tony’s design makes sure the brackets and the caliper mounts are parallel to the mounting bracket, which the Scarebird brackets just can’t do.

Here are the brackets. I used the ultra high temp loc-tite to make sure they stay together. There are 2 different bolts, and they need to be installed in the right place to enable clearance of the knuckle.

Here you can see the clearanceing that needs to be done on the knuckle. The second pic is what the knuckle looks like before clearancing.

Here you can see how the clearancing is necessary for the brackets to clear the knuckle.

Here is the bracket installed. I’ll report back in about 2 weeks when I can drive it after installing the electric fan setup. Believe me, I’m tempted to just bolt the fan and radiator back in to test drive it, but I’ll wait.

Great write-up, Yards! I’ve got a couple questions:

1. Did the spindles / bearings / rotors require any mods to mate the ’71 Riv rotors to the spindles? I think those are also standard B-body rotors, which were even used on some Chevy trucks. This makes them readily available, which is great.

2. I think that perhaps the drum brake master cylinder might need to be upgraded for better braking on your car, does a ’71 Riv master (disc / drum) have a similar footprint as the drum? I’ll have to check.

3. My only concern on these brackets is the spot welded support section… that gusset is being called on to keep the caliper square over the rotor, and under hard braking, the leverage is undoubtedly insanely high at that point. Especially in a 4500 lb monster at full steam at the end of the 1/4 mile. I’m wondering if a continuous weld is a better idea than the spots?

I’m also anxious to hear your results!

Thanks for sharing!

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