i did the brake booster/ master cylinder change out and now i have spongey brakes. . .bled and rebled the brakes. . .

and then changed out with another known good. . . do i need to change the brake pedal play?

if so i've heard a couple horror stories. . this is by no means my daily so i'm not too worried. . would just like to do it right. .

it's a 91 crx si. . had spongey brakes when i got it. . but would stop better. . .replaced mc/booster swap from non abs da and still spongey tried the two i had laying around and still. . .so i'm guessing it has to do with the rod for the master cylinder on the pedal side. . .anyone?

btw getting great fluid through when bleeding. . but it just doesn't stop well until i'm in the last 1/5th of the pedal basically on the floor. . .

changed out prop valve with 4040 as well

 

Sounds like both Master cylinders you have got are old and the seals are going bad. One of my civics felt this way so I went up to the autoparts store and bought a re-built one. Fixed the problem. Come to think of it my DD is starting to feel the same way now

 

really, they were on the teg's that i parted less then two weeks ago and they were just fine on there. . . i really can't justify buying a new one on a whim. . .when they were just fine. . .is there any difference in distance for a teg brake to a civic brake as in pedal distance?

 

anyone?

 

also does the bleeding sequence make a difference. . .i'm pulling no air through any of the lines. . .

as for the booster. . .what it says in the chiltons manual is to pump the pedal to a position hold it, start the car. . will sink a little. . hold shut car off and it should stay depressed for 30 seconds. . . .is this correct

that doesn't work on my daily. . my eg, or on the rex. . .someone must have encountered this

 

anyone done this before? any information would be great

 

well, in my opinion, the bes thing to do would be to start out with a gravity blead, which is just loosen all of the nipples, and let gravity blead out all the fluid/air. then after, get someone to pump the brakes, 4 or 5 times, all the way tothe floor, SLOWLY. pressing the brake pedal vigorously could aerate the brake fluid (little bubbles of air in the brake fluid) which would be pointless. after the pedal is pumped, hold the pedal down firmly. while the pedal is depressed, loosen the nipple on the caliper and let the air/fluid escape. and continue with all 4 wheels.
hope this helps.

 

see the thing is i'm not getting any air. . and i've bled numerous times, i'm thinking it has to do with the pedal freeplay. . .

i've never adjusted the rod though, and that's where i heard there can be a problem. . .so has anyone ever ran into that problem

 

So have you adjusted the rod yet?

I think it sounds like the MC is bad. Won't know until you adjust the rod though.

 

no the mc and booster was pulled about a week ago from a running driving teg. . .and no i haven't adjusted the rod. . i have never done that before. .

but i get great pressure when the car is off. .the booster isn't bad and also when i'm drivin the bottom of the pedal is great i can lock up all four but it's just not normal booster. .i have no room to panic brake

 

The rod only adjusts free play, it won't make the pedal feel less spongy or firm. If you adjust it out of spec, you'll have a lot of free play before the pedal grabs, or your brakes will engage on their own, without you stepping on the pedal.

you should be bleeding in a cross sequence - RR, LF, LR, RF.

if you press very lightly and very slowly on the brake pedal, does the pedal sink to the floor at all?

 

if i press lightly and slowly with the car shut off it's stiff as ****. . .

i didn't go in a cross pattern which i will do soon. . but i've been working on the eg i was going farthest to nearest . . .

but i can't remember if i press with the car on. i will try that tmw i wanna say it sinks for a bit then at the bottom it gets tight. . .i checked the pedal freeplay from normal to brake lights on which was .2 which doesn't really mean ****. . .but in all honesty it seems that the rod isn't pushing mc or something because of how well it brakes at the bottom of the pedal. . .in a light dust i can lock all four up very easily . . . .

it just builds no resistance until the bottom of the pedal


Modified by 96pgtmtx at 2:05 AM 10/14/2008