NoPistons -Mazda Rx7 & Rx8 Rotary Forum

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-   -   Did the 4 piston conversion (https://www.nopistons.com/2nd-generation-specific-17/did-4-piston-conversion-2506/)

90N/A Rex 05-12-2002 12:23 PM


Originally Posted by Powerpack' date='May 11 2002,19:11
BTW, it would be logical that the pedal goes further since the pistons have same distance to travel as 1-piston system but have much more surface to push so more fluid needed.

Do you think it would be further cause of the 4 pistons?? IF that is true then maybe there isn't a problem. I am going by what the pedal used to feel like (kinda hard). Now it feels more like a chevy pedal (goes down about an inch to an inch and a half before it gets hard).

Powerpack 05-12-2002 10:07 PM


Originally Posted by 90N/A Rex' date='May 12 2002,11:23
Do you think it would be further cause of the 4 pistons?? IF that is true then maybe there isn't a problem. I am going by what the pedal used to feel like (kinda hard). Now it feels more like a chevy pedal (goes down about an inch to an inch and a half before it gets hard).

The only thing that bothers me is the 'squishy' feeling you said to have. ??? I think that's about the freeplay I get before feeling the hardness. It will probably be smoother than 1-piston system but you'll get the same braking effect when you're starting to feel the hardness as when you were pushing hard before you changed. You will get a better range of pressure on the rotors (more control accuracy) and much more brake. I can take way over 1G on braking before starting to slip, with the tires I have. I even feel dizzy sometimes after hard braking. https://www.nopistons.com/forums/pub...IR#>/happy.png



Your system might be free of air after all. If the pedal goes down to the same place, the first time you pump after sitting for a day, you probably don't have air in it. Have you tried it on the road yet? :thumbs-up:

90N/A Rex 05-13-2002 05:41 AM


Originally Posted by Powerpack' date='May 13 2002,00:07
Your system might be free of air after all. If the pedal goes down to the same place, the first time you pump after sitting for a day, you probably don't have air in it. Have you tried it on the road yet? :thumbs-up:

So far the pedal has been consistent. I can't pump it up anymore and have driven it all weekend. Always the same. I am going to work now. I will try to bleed it again for the hell of it. If I bleed it and check for leaks and get nothing, then I will assume that is the way it is suppossed to be.

Powerpack 05-13-2002 11:46 AM

So have you seen a big difference compared to the 1-piston system? I hope you're satisfied.

90N/A Rex 05-13-2002 10:33 PM

didn't get a chance to bleed them today we were too busy. Overall the car stops nice and no brake noise. Still trying to be nice to the brakes and haven't stopped hard yet. I like that the rotors don't form any rust in the rain though.

90N/A Rex 05-16-2002 05:34 AM

Figured out the problem....

master cylinder was bad. Bled all the brakes and there was no air and the pedal was still shitty. Tried to bleed the master cylinder and nothing squirted out the one side. SO, I ordered a new master cylinder and will put it on today. Easy $59.00 fix.



~Mike



I had the brake pedal right for about a mile and damn did it feel good. https://www.nopistons.com/forums/pub...#>/biggrin.png

vosko 05-16-2002 10:18 AM

good work. i had the same problem except it was my clutch master cylinder https://www.nopistons.com/forums/pub...DIR#>/wink.png

90N/A Rex 05-16-2002 07:47 PM

Put the master cylinder on and the pedal is great. Thank god($450.00 later) Now I have good brakes and don't have to worry about them for a while.

Powerpack 05-16-2002 08:15 PM


Originally Posted by 90N/A Rex' date='May 17 2002, 12:47 AM
Put the master cylinder on and the pedal is great. Thank god($450.00 later) Now I have good brakes and don't have to worry about them for a while.

There was probably more Chevy feeling on the pedal that I thought. https://www.nopistons.com/forums/pub...IR#>/smile.png



Is the pedal starts to feel hard at about the same place on its way down (you said 1" to 1-1/2")? :unsure:


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