Caprice disc brake interchange.
- Thread starter gearhedjon
- Start date
Are the Caprice rear disc brakes that you're talking about factory rear disc brakes, or aftermarket? To the best of my knowledge, the only Caprices to get the factory rear disc brakes were the Impala SS and the police package cars of the mid 1990s, and those cars had the 5" wheel bolt circle, as opposed the the 4 3/4" bolt circle of the G body cars. I believe that the mounting flanges on the ends of the B body rear axle tubes are different from the G body as well.
Yes the brakes are factory. Yes they are the small bolt pattern. Haven't seen anyone use them though. Does the screenshot help?
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They are the 5" bolt pattern not 4 3/4" bolt pattern like g-body.
With enough time, money, and skill, you can make anything fit anything, but in your case, I think you'd be wiser to try to find a factory rear disc brake setup from either a late '90s to '04 Blazer, or late '90s to '02 F body (Camaro, Firebird). Just my $0.02.
I am assuming since everyone said they have to be 5 x 5 that is what they are but did you ever actually measure the bolt pattern?
I have a couple different bolt pattern templates like the one below to make it easy to check stuff like wheels, axles etc.
For whatever its worth, I'm currently fixing up a 1988 Chev Caprice. This car, as I bought it, was a base brake system, base suspension car. The 1980's box Chevys had 2 different setups. The base setup, which had 11" diameter front disc brakes, and 9 1/2" diameter rear drum brakes. That base setup had wheels with a 4 3/4" bolt circle. The second setup, which was used for police cars, taxis, and station wagons, had a brake setup which used 12" diameter front disc brakes, and 11" diameter rear drum brakes. The station wagons had a slightly wider rear axle, and wider rear brake drums. The larger brake setup has rims with a 5" bolt circle. I'm converting my '88 Caprice to the big brake setup, and I'm going with mid '90s Impala SS wheels. The Impala SS wheels have a 5" bolt circle. As I said before, to the best of my knowledge, GM did not install a rear disc brake setup on the B body cars, which used a 4 3/4" bolt circle. To the best of my knowledge, all of the factory 4 wheel disc brake B body cars used rims with a 5" bolt circle. If you've found a factory rear disc brake setup from a B body (Impala, Caprice, etc.), please post some photos of it, since I'd like to know, and I'm sure that others here would like to know as well. There used to be a popular brake upgrade for G body cars, which involved using a front spindle from a B body vehicle with the 12" disc brakes, and a brake rotor from a late '90s F body with the 1LE brake system. That front rotor was 12" in diameter, but it has a 4 3/4" bolt circle, which would match a G body car. That B body front brake upgrade required different front upper control arms, in order to maintain proper front wheel alignment, since the big brake B body spindle is taller than a G body spindle.
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