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#1 (permalink) Old 11-01-2009, 10:10 PM
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braking down

well here we go,new pads,rotors,brakelines.Bavauto bleed kit,no problems,right!!!!!!!.seems that i get fluid to all brakes,bled,no air,did have to replace master cylander.so sure be okay,not so,rebleed usuing bav pressure bleeder and also the two man way.it just doesnot make since.peddle gets firm and no sponge start car and press brake and wham peddle to the floor,turn car off and pressure and feel back.i'm lost and worn out ,i don't wnat to take to shop,moneys tight,you know econemy.so where do i go back to ,square one?could be abs unit or am i just missing something real easy.i need my car back miss it it's been over a month now ,car is 2000,740i sport.any help here would be great .
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#2 (permalink) Old 11-04-2009, 07:19 AM
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Have a read of this might be of some help:


IF the car has ABS (anti lock brakes), the dealer is probably the only place that can bleed the ABS system. a scan tool has to be plugged in and actuate the ABS valves to purge the air in it.
IF the ABS system was opened up, it'll need to be bled.
if it wasn't, it should be fine.
a brake pedal that goes to the floor is a sign of a bad master cylinder or air in brake lines.

all those things that were replaced were unnecessary unless they were broken.
brake boosters rarely go bad, as does master cylinders and calipers. it's possible, but something doesn't sound right.

Even a NEW master cylinder can go bad! They are made by man, man is not perfect.

You need to inform the mechanic that you want to see your old parts next time, and/or take them with you.
and also, make him prove the parts were bad.
replacing the booster & master cylinder are not standard brake replacement practices.
a bad power booster will make the brake pedal go hard. so hard you could stand on it and it'd barely move.

Also, it could be the connecting bar between the booster and master clyinder aren't connected properly.

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