No brake pedal

[stoney126]

Hey all I did the disc brakes on my 14ff awhile back. The brakes work but the pedal hits the floor. Its s 84 blazer cucv diesel. I have bled and bled the brakes. I also used a pressure bleeder and gravity fed them as well. Still no pedal. I havent done anything to the system besides add the rear discs and calipers (3/4 ton chevy)

Ive searched and read everything for about the past couple of hours and nothing is a sure fix. Im kind of tapped on cash so I cant go throwing money at it. I guess I need a list of where to start diagnosing the problem. thanks all for any help

 

[K5dreamer]

ive been told by one of the members on here that he upgraded to a larger master cylinder, the other thing to look at, is leaks in the system. If the pedal hits the floor you may be losing line pressure somewhere with a leak.

 

[stoney126]

I cant see any leaks at least none that are leaking fluid. Ive read about going to a larger MC and it not solving the problem. Also mine is a diesel so im not sure if that would be an issue with getting a new mc. It stop good but it bottoming out and I imagine its no good for the MC. Now my Mc is the original one on there so maybe it is time for a new one.

 

[K5dreamer]

just for the hell of it.... have you bled the front brakes?????

a bottoming out pedal, as you apparently already know, is a prime symptom of air in the lines. also sometimes swapping from rubber hoses to steel hoses can improve brake feel.

 

[stoney126]

I bled the fronts. Switched to braided lines when I lifted it. I am kind of curious about the fluid that was in there before. Im not sure if it was a DOT 3 or maybe something higher that isnt blending with what i got. I ran the pressure bleeder at about 13 psi. I would say I ran about 2 quarts through the Mc.

When I do bleed it I dont touch the stock prop valve. I forget but I believe there is a button that may have to pressed when bleeding but I dont know.

You would think a bigger Mc would be the ticket being the rear reservoir is about half the size of the front reservoir and I be all over it if i knew for a fact it would work.

But Im going to bleed it again with the pressure bleeder but maybe give some special attention to the front.

Also I wonder How you can tell you pulling air in along the line?

 

[K5dreamer]

honestly, ive never used a pressure bleeder, im a fan of tried and true good ol clear tube and a glass bottle bleeding.

get a buddy to sit in the truck, and pump the brakes then press and hold. Youre under the truck with a length of clear tubing slipped over the bleed valve on the brakes, and a box wrench on the bleed valve hex head. crack the bleed valve, let fluid squirt out till it starts to slow, then close it.

rinse and repeat until there are no more bubbles in the fluid. This is how ive done it on every car ive ever worked on and never had a problem.

 

[stoney126]

This is usually how I go about doing it to. But I didnt want to work my old Mc to death. LOL the look I get when I ask my wife to come pump the brakes....priceless