72 Auto Booster Size

[andyk_79]

With not having my car at home at the moment but trying to organise parts, I'm trying to work out what brake booster I need to order.

 

I saw somewhere that the autos came from factory with the bigger booster (and different stud pattern) that was not fitted to the manual till 73, but was hoping to get some more surety.  Would be a simple case of grabbing the tape measure if the car was here - so frustrating!!

 

So can anyone confirm - do I order a 73 onwards booster ?  I won't hold anyone responsible for their posts!

[Retro Z]

You will need the smallest sized one. 73 onwards the boosters increased in size 3 times on the s30's.

 

I know this as my 240z is a 73 and i had a 71' parts car and the 71 booster did not fit along with the pedal box as the firewall holes are different between them. I also purchased a 75 260z and late 2+2 booster which was also different again.

 

70-72 -smallest booster

73-74. (240z and 260z) 2nd smallest

75-76. Bigger again

77-78. Biggest

 

Not sure about manual or auto but my 71 manual booster is now on a friends 72 auto. And my personal 240z 73 was an auto is using a 74 260z manual booster.

[andyk_79]

Thanks - if your 71 manual went onto your friends 72 auto it sounds like the autos had the same size (and therefore same stud pattern - there was a difference in stud patterns between 71 and 73 from what I understand).

 

Will go with the option of getting mine rebuilt then rather than trying to source a replacement.  Reduce the risk !

[d3c0y]

The '73 one will be fine.