1970 Corvette Brake Master Cylinder

[Daniel S.]

Hi Gents,

I'm looking for reference photos of an original 1970 Corvette brake master cylinder. Are there original/factory units dated or just have a part #? Do they have bleeders?

Anyone have a good source to rebuild/restore a core back to factory original specifications? Unit will be for my '70 LT1 convert.

Thanks,
Dan

[Jim T.]

Re: 1970 Corvette Brake Master Cylinder

My 1970's brake master cylinder does have bleeders. On the front of it there is a stamping of one letter, looks like a "G".

[Terry M.]

Re: 1970 Corvette Brake Master Cylinder

David
Original 1970 (and 1968 to 1972 for that matter) master cylinders have a casting number on the inboard side, two steel (silver color plating) bleeder screws and most will have a Julian code date stamp on the forward brake line port machined surface. They will also have a two letter "broadcast code stamped on the front semi-circular machined surface. A good description of the finish as well as the casting numbers and broadcast code is in your version of the 1970-72 TIM&JG. There is some controversy over the casting number for the power brake master cylinder, but it involves the numbers 6 and 8 so if that is your situation read the number without too much concern for those two numbers.

[Alan S.]

Re: 1970 Corvette Brake Master Cylinder

Hi Dan,
Here are a couple of pictures from my 71 standard brakes master cylinder.
They illustrate the the 2 stamps on the master cylinder and also one on the distribution block you might want to check for.
Regards,
Alan



Here's the Julian date stamp. the surface it's on is a machined surface so is unpainted even
though it looks painted in the picture. 0 336


And a Julian date stamp on the distribution block. 0 259

[Joe L.]

Re: 1970 Corvette Brake Master Cylinder

My 1970's brake master cylinder does have bleeders. On the front of it there is a stamping of one letter, looks like a "G".

Jim------


If it's a power brake master cylinder the code should be "PG". So, the "P" may be very faint or, perhaps, it was somehow omitted.