I finally did the 4 piston caliper conversion along with 4 powerstop x-drilled rotors and metal master pads. The system was bled twice and there is plenty of fluid. Now the pedal feels "squishy" and goes down way further then before. :newburn:



I am going to try to bleed the brakes again on monday but does anyone have any ideas? Was there a different master cylinder for the 4 piston calipers?? The install went easy, but of course nothing can go totally smooth. ???



WTF!%$#!@$

Make sure that there are no leaks from any of the flare fittings. That's a possible source.

I thought about that too. I can't push the pedal to the floor though and the fluid is still full. It would have to be a small leak then.

If you have a small leak you should feel it on the pedal if you keep it down long enough. I have a 4-piston system on mine as standard I may check for a part number on the master cylinder.



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.

I would say there is still air in the system.

Yeap thares air in thare somers.

all the master cylinders are the same

Thats what I thought too. Air is trapped somewhere up there. Guess I will bleed the !##!&*(^@ out of it and see what happens. Let you all know what happens monday. Thanks!! :thumbs-up:

Are you sure that you're bleeding the system properly?

Yeah...I am not even doing it myself. My dad owns a shop that I work at. My dad (who has been a mechanic for 30 years) and a mechanic there (who has been a mechanic for 20 years) bled the brakes. We were running short on time so maybe they didn't get all the air out. But bleeding brakes on a 7 is the same as any car, which they do everyday. I am also thinking that I should be the bleeder cause the mechanic who did it probably can't press the brake pedal down all the way since it is small and he has boots on. We'll see tommorrow.

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:

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.

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

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.

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

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

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: