ok last night i swapped in a new master cylinder . bench bleed it and ever thing ,bleeded the the rest of the system worked fine for bout 2 or so minutes then the pedal got so damn hard i couldnt press it down even a inch these is while i'm driving mind you the brakes start to get stuck into place so i have to drop gear to 1st just to keep the car going til i could get the car to a parking lot . the only thing i could do was take the mc of the brake booster(lines still attached to mc) and use the e-brake to get back to the house ? any one know what this could be ? i need help i need to get this car on the road quick before my wifes car goes in to the body shop are we'll be stuck with now car! thank you

 

A dragging caliper will cause this problem.

 

dragging caliper will make all the calipers do this i have the aas sensor cut on the bottom of the mc and i havent disconntected the computer for it in the back spare wheel area ( thats where its right ), could this be the problem cause i'm just trying to narrow it down cause if it isnt that then its my brake booster then cause i just got new calipers put in the rears and the fronts are fine i really think its my booster which suck cause that going to be a punk to take out

 

will the brake booster out of a 4 lug work for a 5 lug cause? i have a parts car with a good booster i know for sure.

 

bump

 

i say brake booster= broken, did that brake booster come out of a turbo, or na, S4 or S5, go get the right brake booster im almost 100% sure thats the problem. and when you replaced the mc did you put the pin back in the brake pedal?

 

its the stock brake booster all i did was replace the mc. its a s4 gxl. and when i replaced the mc i didnt take no pin out from the pedal . so if its a bad brake booster can i swap the one from my 4 lug parts car to my gxl and every thing will be fine . or do i need to get another one ? thanks

 

bump