Hello,

I will upgrade my rear brakes soon.

I am going to add on my car an adjusting proportionning valve with a **** for my rear disc brakes on my 86 trans am (factory 4 discs brakes).
I will put it just after the proportionning block.

I need to know the fitting size / thread of the connection of the rear line on the proportionning block.

Thanks for your help

Marc

A 15mm wrench is needed to unbolt this fitting.

If it may help...

THanks

Marc