Brakes / need a recommendation

[Jerry]

It  has been awhile since i have done any work on the buggy a little here and there. It has been so hot.

I just took the buggy for a ride around the block, and found out that i have no brakes probably never did (because ths is only the second time it has been driven). If i spin the wheels off the ground and hit the brake pedal the wheels stop quick. I see no leaks in any of the lines or calibers, the master is full. the pedal assembly is Doug's. I have two rear polaris calibers and two, two  piston dynalite front calibers. So a total of six pistons. The master is 3/4 diameter.

My guess is that my master is way  to small (my guess i need a two resevroir).  When i hit the pedal to slow down i can not tell that i hit the pedal (meaning i do not slow down).

What would you suggest i do for a larger master, I would like to go with a master from a car just easier to get my hands on.

[fabr]

First we need to determine the size master needed. What diameter are the pistons in the calipers? From there we can begin to let you know what size/diameter master you need. You can quite likely find a cheap master for a car if you have a good parts guy that will let you look through the catalogs picture guide if they have them so you can see the congfiguration of the master.

[Jerry]

The 4 frt pistons should be 1.38 dia the two rear pistons should be 1 inch.

[Doug Heim]

Its my pedal set up but are you using the same master Cyl. I recall an order going out where the customer was going to source their own master, Was that you?

[Engineer]

Is the pedal going to the floor?  Or is it firm?  If there is air in the system, it would easily stop a spinning tire, but not have much affect stopping the vehicle.

[Jerry]

The pedal is firm.

Doug I got the master myself, I do not remember the make but i can get it if you need it

[Punkur67]

Check to see if you have a warped rotor. I got a brand new pair of cnc disk brakes and had a warped rotor. As you travel the rotor pushes thepiston in and when you go to hit the brakes you need to pump them to get the pad in contact with the rotor again. Also check for air

[Jerry]

I now the frt's are not warped, i will check the backs. Believe me pumping did NO good.

[Doug Heim]

R U sure there is no air in the lines?

[chrishallett83]

Is the pedal hard, or spongy?

If it's hard, you've more than likely got a blockage or kinked/crushed hose from the master.

If it's spongy, you've probably got some air in the system, or the master is kaput. Could be the piston seal is perished.

[Jerry]

I am out of time for this weekend (dam). I will re bleed the brake: i do not think that is the problem though. I do have resistance on the pedal, just not that much. Maybe i will get a real ride in someday :-\

[fabr]

AIR

[Az Transaxle]

Jerry, It has been my experience with brakes that air will cause a spongy pedal that gets better if you pump it. If the pedal is firm and you don't have a blockage in the line a smaller master will create more clamping power although it will need more pedal travel.

[Doug Heim]

in more than one occation I was certain I had no air in the system but it always bit me in the @ss. My money is on the air. Take the time and get a friend to help you, It also helps to have a bleeder at the master.

[chrishallett83]

Pressure bleed it, i.e. pump the brake fluid up to the master from the caliper. Works heaps better in my experience.