proportioning valve won't let your pedal go to the floor, that's air in the line. Did you bleed the brakes in the correct sequence? Rear right, rear left, front right, front left? When you replace the master cylinder you need to bleed the brakes a lot to get all the air out. On a wheel cylinder or soft line it's not so bad, but on a master cylinder I'll go through a couple cans of brake fluid sometimes just bleeding the lines.

 

did you bench bleed the m/c before you mounted it ?

 

hi to all and thanks for the replay and yes it was air on the line ,but the problem is on the proportional valve one of the cylinders on the proportional valve is leaking and apparently the air is coming into the line by the cylinder so i will have to replace this valve and i know that is very expensive or bypass the valve,
any one knows if you bypass this valve it will be a great difference on the brake ?
thanks

 

Don't bypass it, it is there for a reason.
You can get a replacement new or used component from a few of the Zook venders out there in internet land. It may be cheaper than you expect.
Contact a few of the following:

PetroWorks
HAWK STRICTLY SUZUKI | Welcome.
Welcome to the Trail Tough Products

 

hi to all again ,i bypass the valve until i get another valve but the way i that did it was so simple and come out so good that i want to talk about i wen to home depot pluming department and i get 2 1/8 brass coupling and i put a nut inside the coupling and screw the 2 lines and it work perfect and only cost me like $3.00 and i have picture of all so if any one want more detail email me and i will send you the pictures ,the only difference that i have is that the rear tires get stuck if you break hard but this is great for me because i an using 31 and my samy break like a beast,so i will look for the proportional valve but in the mean time i an happy bypasin the valve for $3.00,

 

i have another question in reference to brake after i change the master cylinder the brake pedal is extremely soft and i was thinking that the proportional valve was the problem but after bypassed still the brake pedal is very soft ,any ideas
thanks to all

 

That's because you bypassed the preportioning valve...

There is a reason it is there.

If you want to have more stopping power, go to a firebird master cylinder instead of changing the front-rear balance with a cheap fix.

 

no i have the soft brake pedal brake with the proportional valve and with out it
thanks

 

Any responses? I have the same issue I bled it through three times and have cleanest newest brake fluid going through it now but still rather spongy

 

spongy indicates air still trapped in the system, or wheel cylinders / calipers that may be stuck, correct bleed sequence is key.

try starting a new thread rather than piggy backing on a 10 year old one

 

I have never bled the M/C. If i've fitted a new one I always run fluid thru it before tightening the lines, usually takes about a litre to bleed the system fully. I have always started closest to m/c and finished furthest from it so its pushing the air out as you work down the system.

 

Most vehicle manufacturers recommend bleeding furthest to closest.