310 sunny

Awesome thanks guys. I'm thinking a 13/16 with a booster is the go. Like I said, my previous coupe had TRX Bluebird discs all round with a booster and I didn't mind the feel of how it stopped. It actually could have stopped a little easier with the same pressure for my liking. It had a '84 TRX MC with a 120y booster.

PIGDOG when you say "Sunny" which model specifically so I know what I'm looking for?

sunny booster is also an option. any of the relatively small boosters will still give plenty of pedal feel, id say on my car you have better pedal feel with the booster than without. As without the booster the pedal was just rock solid all the time and you physically couldnt get the car to stop anywhere near as good as it should. mind you that was with r32 brakes all round adn a 15/16th master
but i feel the booster made the car stop far better and gave you more feel for how much pressure you were actually applying

i also had landcruiser front brakes and r31 rears with a 7/8th master with no booster and that pedal was almost to stiff for street driving

but thats just me, im yet to drive a car that isnt running a booster that i think stops nicely. i like to be able to pull the car up confidently using just the force from my little toe on the pedal

13/16th master that will be a straight bolt in replacement will come from a datsun sunny, providing you already have a dual res master cylinder in the car currently. Easy enough to just go to a brake place and look through a master cylinder book. just look at the datsun ones from the 70s and 80s in the size you want. if they look the same as the ones you have now then there is a very good chance they will be a bolt in replacement

Go the 13/16 then no booster

Well a booster always softens up the pedal a bit. Some do not like the feel of a booster, but in general it is a good compromise.

I'd say I'd like less pressure but not too much travel. So a happy medium?

If I installed a 7/8 which is the largest (meaning hard pedal but least amount of travel), coupled with a booster which means not as much pressure required would give best of both worlds? Yay or nay?

the BETTER option is what you want. It is simply user preference.

Do you want a HARD pedal that takes more leg pressure to stop the car?

Do you want a car to stop quicker with LESS leg pressure?

I know if 2 cars running 4 wheel disks on stock master no issues. Just depends if you want hard pedal it ok with a little more travel.

IM adjusting as running 4 spot fronts with drum rear. Pedal touch longer but not to the floor it anything

Thanks DD. I know you say stock 11/16 CAN be used, but does this mean there would be a better option? I'm not really concerned about getting away with having to change it, but rather the best option/combo.

If I did use the stock 11/16, will it still be suitable if I'm changing the rear drums for discs? I thought they were different?

R31 discs won't be too big for the S13 fronts? Don't want uneven bias??? Are TRX smaller?

> If using S13 front brakes and R31 rears (or similar), I will need a 13/16 or 7/8 size master cylinder.

No, you can use the stock 11/16" size.


> What are the differences between 7/8 and 13/16?

1/16 inch. Larger diameter requires more foot pressure to stop the same. But in return there is less travel. The smaller master will stop better for the same leg pressure, but the pedal will move a bit farther.