Has anyome had issues with no brakes or lack of booster effort when left foot braking. Ie left foot braking keeps boost up therefore no vacuum therefor no assist. If so, dld you just remove the booster piping and redrill the pedal for 6.4:1 or did you go to full balance bar set up and dual master cyl's.

Justin

 

I don't know anyone who's gone with dual master cylinder and balance bar, or anyone who's had issues with the stock setup, albeit different calipers and rotors of course.

What's your reasoning or use for left foot braking? That might help us.

 

 

So you're a professional rally driver? Otherwise I still fail to see the reasoning. Although I'm sure there's a much easier way to achieve brake boost pressure without going to dual master cylinders.

 

Curly the reason we all join this forum is that the other forums are full of pimply faced kids who don't know ---- from clay but sprout off any crap that they have learnt from the back of a batman comic. It gets tiresome when you spend half your forum time trying to figure out who is full of ---- and who actually owns a miata and has actually used their brain to help you out*

I asked a valid question and if you don't know the answer then perhaps its better to keep your mouth shut.

1 brake boosters are vacuum powered
2 if you left foot brake to keep boost up for corner exit speed/horsepower then you will rapidly run out of brake boost.
3. You can disconnect the booster by using a marble or hose blocker
4. You then need to modify the brake pedal from a 4:1 ratio to a 6.2:1 so as to have good pedal feel
5 if you do all that then you might as well put in a pedal box and twin master cylinders to have total control over bias

No I am not a professional rally driver but yes I do rally and in both my previos cars left foot braking was the best way for me to go

Justin

 

Hmm, well I'll step out then, good luck. I'd hate for my pimply faced self to inhibit your brake endeavors.

 

To my knowledge the Miata brake booster line hose has a one way valve in the hose closest to the booster. Not sure if this helps or make me look 13. I could get my girls little brother in here tho

 

Sorry guys I apologize for the above. Sorry Curly I didn't mean to be harsh

I think the one way valve doesn't stop the issue, many older cars had a vacuum tank to help, the problem is that being turbod you reduce the vacuum time to off throttle only and off you heel toe or left foot brake it give problems

I guess the answer will be wait until I finish the build and just go and throw it at the trees

Justin a 44 year old body with 11 year old brain

 

I'm thinking you may be in new territory here. Although I guess anyone with a turbo car can go test this right now...

 

I'm on it! Wait....cars down for a few days. I'll get back to you.