Stiff brakes, no stop

[rocket455]

So one day, I noticed that my brakes were only working on the front. I check my fluid level and the reservoir was empty. Upon further inspection, I find out that the master cylinder is bad. The rear seal on it was leaking and all of the fluid was in the Brake Booster. I replace the Master cylinder and remove the fluid from the booster. The Master cylinder is bench bled and installed. I bleed all of the brake lines.

After this is finished, I roll the car out of the drive way and the pedal is stiff. Like it wont hardly budge and the car is barely slowing down. So I figure, its a bad Brake Booster. I replace that. Reinstall everything, re-bleed everything. Same outcome. I am in a bind and can not figure this thing out. The new brake booster is holding vacuum as it should.

Help me, SHOForum

 

[frosho]

Seized caliper(s)?

 

[Irish Pride]

looking at your list of mods i assume you have SS brake lines? did you have any issues bleeding the brakes?

 

[luigisho]

That's my question too. How was the brake bleeding? It seems like you have air in the line or a collapsing hose under pressure. Best guess off the cuff. I would look at fluid moving through the prop valve and old hoses at all the calipers. Did you activate abs while bleeding the thing?

 

[LOUDSHO92]

Is the rod/piston not properly aligned when you put it in? I had a similiar issue and it was because the rod was not centered corretly. it cause a super stiff pedal with no braking.

 

[sperold]

Your "new" master cylinder could be giving you grief. With the help of a friend, crack one bleeder and step on the pedal and see how much fluid comes out. I don't have to tell you about screwing the bleeder back down before you release the pedal. My guess is not much fluid will come out. I have had them bad, right out the box. Can't explain why, but maybe something goes wrong with the valving.

 

[sdpatt]

Ditto. I installed 3 master cylinders one weekend before I got a working version.

 

[rocket455]

When i go to bleed the brakes, fluid squirts out, so there i don't think its a collapsed line. I tried readjusting the master cylinder back onto the rod and i still get the same result. Ill try getting another master cylinder and see how that works out

 

[kevinspann]

You have started the car, yes? Obvious, and you don't seem to be oblivious, but I'm just making sure.

 

[rocket455]

Yes, I've started the car to get vacuum to the booster

 

[intimdatr]

Are the pads glazed?

 

[93markVIII]

almost has to be MC.