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 Post subject: Re: Brake Speculation
PostPosted: Mon May 22, 2017 11:48 pm 
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Joined: Tue Mar 19, 2013 11:30 pm
Posts: 1335
Location: Canton GA
S13REMI wrote:
In regards to my intital post I am doing a ZL1 brake conversion on my caprice. What I have found so far is the following. The front calipers and rotors bolt right up on our cars, and can use the factory brake hoses on our cars.

The rear is where I ran into trouble. The off set of the ZL1 rotor does not work with the ZL1 caliper and our stock spindle. There is about a 1/2" space between Caliper and spindle when the Caliper is centered on the rotor.
I picked up a set of 15 SS rear rotors from Advance (assuming they gave me the correct parts) the rotor's diameter was about an inch to small. I should have snagged a picture. The spacing of the rotor was perfect and would have allowem me to bolt the calipers right to the knuckle though.

LOOKING INTO THIS FURTHER I THINK I WAS GIVEN THE WRONG PARTs
edit again they gave me the right part according to their computers. I think their computers are wrong. The description of the part says its only 12.7 inches as apposed to the 13.7ish the ZL1 rear rotors are
https://shop.advanceautoparts.com/p/car ... tor+-+rear


OK....here's some further comment:

ZL1 rear brakes are exactly the same as standard Camaro SS (2010-2015) Brembos--only difference is the paint job on the calipers.

The Camaro (and 2nd Gen CTS-V) rear rotor is 365mm diameter (14.2") and has a larger park brake "drum" for the DIH (Drum In Hat) park brake system compared to the PPV, SS Sedan, and G8 rear brakes.

The correct rear rotor for installing Brembo calipers on PPV (and SS/G8) is from the 2015-2017 SS sedan - 360mm diameter, with the 190mm park brake drum size common to PPV, SS Sedan & G8 (and a number of other vehicles, including Corvette and 94-96 Impala SS).

It does sound like the incorrect rotor was identified and supplied--and is actually the same size as the PPV uses - 324mm, or 12.7", which WAS the original size used on the 2014 SS Sedan, which used the same single-piston caliper as on PPV.

At this point, I'm only aware of two sources for the correct rear rotor--either GM or Centric. I do not know if Advance Auto Parts sells Centric.

Here are the specs listed (incorrectly) at Advance Auto Parts for the 2015 SS Sedan rear rotor:
(in reality, this is the 2014 SS Sedan rear rotor)
Discard Thickness: 20 mm
Bolt Hole Quantity: 5
Bolt Circle Diameter: 4.72 in
Outside Diameter: 12.76 in (324mm)
Height: 2.20 in
Nominal Thickness: 22 mm (compare to correct rotor below at 28mm)

These are the correct specs for the rotor you need:
(Centric online listing)
https://centricparts.centriccatalog.com ... 1&uid=ANR&

_________________
Bill Harper
inov8r@windstream.net


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