Brake master; any problems going older?

[C Pierre]

Finishing some upgrades to a 1975 280z and I have been reading up on the brake master the past few days. I have (almost) installed a MM rear disc package and went to remove the check valve in the rear line at the MC. Something didn't look right as the MC installed does not agree with the 1975 FSM diagram..

 

 

Correct me if I'm wrong, but it looks like a 240Z MC. Is there any problem using this in a 280z? The rear reservoir is hooked up to the rear brakes and they seemed to work OK last summer (when it was last on the road).

 

[luseboy]

As far as I'm aware, the 240z through 280z used the same master cylinder. You might be confusing the 280zx 15/16th's master for the 280z 7/8th's master. Unless you're confusing the brake booster for the master cylinder? Some people use a 7/8th's master even with a rear disk package. It is, however, reccomended to use a 15/16th's master out of a 280zx. Personally, I plan to use a wilwood 1 inch unit as I am upgrading the front and rear brakes to a much better system. I'd say try them as they are and see how it is.

[C Pierre]

I have an early Autobooks 240z manual that shows the MC the same as in my car. The 280z FSM for the car shows the reservoirs reversed.

 

post Sept 1971

 

I hope that's the only difference ..... but I've been wrong before. I won't be racing, so I'm trying out the stock MC first and upgrade to a larger one later, if needed.

[luseboy]

The resevoirs are removeable. You could switch them if you want. I'd think it'd be better to leave it as it is, as the front brakes are vastly more important than the rears. But someone more knowledgable should be able to tell you for sure.