rkeller411

Is the brake Calipers for the 1970 LT-1 different from other brakes on 1970 Corvettes?

terry82

no .brake calibers from 1965 to 1982 are the same.

rkeller411

I think it's the HD calipers based on casting numbers? I'll get back to shop on Monday and grab my notes

Duntov

The dual pin caliprscare different castings. Standard LT-1 used ordinary calipers just like the other year disc brake vettes.

LT-1 kid

I thought every thing on a LT-1 is special

Alan 71

Hi,
Regular (is that possible?) LT-! cars had standard brakes and standard calipers.
Here's a photo of the HD brakes (front) on a 300 mile 72 ZR-1 showing the HD brake pad's configuration. (No pin.) I believe these were part of the ZR-1 option.
The bosses for the standard brake pad mounting pin appear to have been machined off.
Regards,
Alan



And on an LS-6 car. Note the additional machined area.

redvetracr

that is incorrect, dual pin J56 castings are the same as a std casting

fever1

I have a 1967 vette coupe with the optional J-56 brakes and the dual pin calipers are a different casting # different master cyl and proportioning valve also. Have owned this car for 46 years and is original, Jus saying.

redvetracr

different from what? for a `67 the castings should start with 545

fever1

different from the single pin castings

Dirty Dalton

1970 LT-1 Look carefully and you can see the typical 'bump' for the pin in the first pic, and the pin, etc, in the second.

redvetracr

absolutely wrong!

David Mc

I think what redvetracr is saying is the castings start off the same but J56 pads are different and the calipers are modified to use them.

gbvette62

J-56 calipers are the same casting numbers as regular calipers. The pin tabs are milled off, two pin holes are added, and different pistons are used, but the castings are the same. The fronts are 5452270 and 5452273, and the rears are 5452281 and 5452284.

67 J-56's did use a different master cylinder. Regular brake (manual & power) 67's, came with the 1" bore master cylinder, casting number 5455509, stamped "DC". J-56 cars used casting number 5460346, with a 1 1/8" bore and stamped "PG". There's nothing special or unique about the 346 PG master cylinders though, as they were also used on all 68-72 Corvettes with power brakes.

From 66-69, J-56 Heavy Duty Brakes were a stand along option, available on any Corvette. From 70-75, J-56 brakes could only be had as part of the 70-72 ZR1 or ZR2 Special Purpose Packages, or the 73-75 ZO7 Off Road Suspension & Brake Package.

So to the OP's original question. As Alan pointed out, unless the car had the optional Special Purpose Package RPO ZR1, all LT-1's came standard with the same manual disc brake system, as any other Corvette.