Just a general question on how people feel about the braking performance from the 8.4" disc setup. I have that on mine (haven't driven it yet) and I am hoping it will be pretty good for the weight of the car, bigger than the 7.5's so I assume they'll be fine. No brake booster fitted, not sure it they make a difference or not?

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1972 Mk3 Mini 1000, 1150cc supercharged.
https://www.ausmini.com/forums/viewtopic.php?f=3&t=95872

Yes a booster makes a difference it feels like a modern car not Fred Flintstone's.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Doc! haha! I'm a Fred Flintstone then!

Maybe I'm wrong but I thought without a booster the brake efficiency is the same but you just have to stand on them a bit!?

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67 Deluxe
Dry suspension
1293cc, 11:1 comp, RE 282 camshaft, 45 Weber, extractors etc
4 synchro close ratio gbox
Cooper S brakes, no booster
Stealth box, as Doc says "goes harder and idles!"
RH tank cos I needed it crossing the Nullarbor etc..

Am I right in saying the last Mini (1275 LS) had 8.4" discs with no booster.

Yes. An MG midget had the same, they felt like a block of wood too.
My car has S brakes and greenstuffs. Had no booster for 25 years but I had one on the shelf.
Fitted it on a few years ago, no way now would I remove it.
It lives under the dash... No room under bonnet due to Matic heater.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Correct. The booster doesn't change the pad to disc friction, just the force at the pedal.
I've been driving my 7-1/2" disc braked mini with no booster for some years now and am accustomed to the pedal effort. My son took it for a drive over Christmas with me and remarked how hard you had to push the brake pedal.
Doc is correct that a booster will make it feel more modern, but so would power steering, air con, twin cam, 6 speed auto, power windows,......
I like my mini as it came, simple raw motoring.

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Find a job you love and you will never have to go to work !

So Phil, stick with what I've got I think? I really couldn't be bothered with all the effort/ expense/ dramas to install a booster.
However, I do warn/ train anyone who takes my cab for a drive they must STAND on the brakes if they want to stop in a hurry!

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67 Deluxe
Dry suspension
1293cc, 11:1 comp, RE 282 camshaft, 45 Weber, extractors etc
4 synchro close ratio gbox
Cooper S brakes, no booster
Stealth box, as Doc says "goes harder and idles!"
RH tank cos I needed it crossing the Nullarbor etc..

So the 8.4" brakes will stop the mini pretty well? Just have to stomp on them a bit, I can live with that I think.

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1972 Mk3 Mini 1000, 1150cc supercharged.
https://www.ausmini.com/forums/viewtopic.php?f=3&t=95872

Yes, that’s right!
Tandem master but not power assisted.

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Justin

I have the 8.4's, no booster. There is no stomping required, I find big toe pushing sufficient in traffic, but I guess it depends on how hard you drive.

I drove around with the drums for a while and got used to the stopping distance.

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Nick

http://www.ausmini.com/forums/viewtopic.php?f=3&t=86675

How are 8.4's compared directly to 7.5's?
Lets say it's the same car, same wheels, same road etc what is the difference?
Coming to a normal stop from 60km/h would be easier and or quicker yeah?
Is brake fade and heat issues less common?
I'd assume breaking distance under heavy/emergency braking would be the same as tyres would be the limiting factor...

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Respect mine and I'll respect yours.

8.4 needs less pedal effort than the 7.5, both unboosted and with greenstuff pads.
Not exactly like for like as my car has 13" wheels to suit the bigger brakes.

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Too many cars, and too little time.

Man, having 4 wheel drums and no booster is a learning curve. I thought stopping the torana was hard. Feels like the whole weight of the car on one foot haha! I was thinking of 7.5s and no booster just for a bit of safety, but I am definitely enjoying the "active driving" aspect. Im interested how you mount a booster inside though??

Sent from my SM-G900I using Tapatalk

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http://www.ausmini.com/forums/viewtopic.php?f=3&t=93352

If I'm carrying on like a pork-chop, I'm having a great time.

If I go very quiet there's a very good chance I broke something.

Ha ha. It's funny reading stuff like this. Back in the dark ages, cooper s discs were state of the art. You could go further back to Austin 7 's.... cable operated on two wheels only. More lime speed retarders than actual brakes.

I drilled 2 holes in the firewall, and made another sandwich plate for the 2 brake lines and vacuum hose, where heater hoses normally go through.
Will add pics shortly.
Booster is a MK 2 S one, PBR VH 44J.
I can pull the motor out without the drama of booster and piping in the way.

There is more foot room than there is with a Clubby heater.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.