I just finished rebuilding my EK hatch.

New brakes were installed along with new master cylinder.
Brakes have been bled "the right way" time and time again. atleast 10 times. lines are not leaking at all.

Brakes work normal on the street or highway.
but when goin slow to park or anythin the pedal will just go down to the FLOOR! have to be pumped to come back up.

any ideas what else could be? prop valve?

thanks for the help in advance.

 

sounds like a vacuum issue. Getting good vacuum at cruising speed (or at least adequate), and then not enough at idle. Is the main brake booster vacuum line connected and tight? (you know, the big *** hose that goes from your master cyl, to the back of the intake mani)

 

that actually makes alot of sense. ill check it as soon as i get home. i think i just plug it in bt didnt put anythin to tighten it down.

good lookin out hopefully that fixes the problem.

 

Vacuum is not likely the problem. Vacuum is only needed for the brake booster, which will make pressing the pedal more difficult when not working. I think air is somehow getting into the hydraulic system or the "new" master cylinder is faulty.

 

make sure that the "check valve" (little white plastic thing separating the 2 hoses) is in, and tight, and going the right direction. It should be right next to the "bracket" that holds the hose, about 5 or 6 inches from the port on the master cyl.

 

ok ok ill check em. this is all useful so thanks guys.

 

my vote is for a bad master cylinder

 

it was just swapped out with a brand new one thinkin it was that causing the problem.

unless they gave me a bad one
that was also bled out just in case.

 

yes I read that. its classic symptom of a bad master c.
New parts do fail