Brakes were working fine until I replaced the hydra booster. Now I don't have pressure in the brake line. Bled the brakes (RR, LR, FR, FL-nothing, then gravity bled them- still nothing, then individually bled them again but no fluid was coming out of the rear). Have fluid going from the master cylinder to the ABS module, then from ABS to front calipers but not to rear drums. Nothing coming out of ABS line for the rear brakes. Could ABS need to be cycled or is the master cylinder bad as well. Changed hydra booster because it was leaking. No ABS light on just no pressure on the pedal. Won't even buidl pressure on the front.
Try bleeding your ABS block first, if that doesn not work could need a master or proportioning vavle. Some scan tools are capable of bleeding the ABS system on some vehicles, and some you have to bleed manually.
SOURCE: Brake pedal goes nearly to
I would go with not bled correctly
The booster should hold up with a hard pedal until
you start the engine, then vacuum causes it to move
down when pressing on the brake
SOURCE: 2005 f150 spongy brakes
it sounds like your still not getting all the air out of your lines. it helps to have a brake bleeder but they are expensive, it also could be that the gasket inside the master cylinder is inverted even if it is a new master cylinder this could be the case, ive had four bad remanned ones in a row, before i got a good one... hope i could help
SOURCE: brake pedal dropping to floor
do u have the antilock brake bleeding tool? if not you will need to have the dealer bleed the brakes, the ABS control valve must be electricaly held open to bleed the brakes there of course is a special tool for this.
Testimonial: "Thank You"
SOURCE: bad brakes on gmc suburban,
Gravity bleed your brakes starting at the wheel farthest from the master cylinder. No pweddle pumping. I Fill M/C and leave cover off. Then open the bleeder and watch what is coming out. Uou can see bubbles. When the fluid drips steady and without bubbles, cole and do the same to the other three. Don't let the master cykinder get low because thr fluid level helps move the fluid and air through the lines.Periodically tap the break lone with your wrench to keep everything moving.. When sll bleeders drip clean and steady. Make sore your rear brakes are adjusted to barely touch the drum. Then top off the master cylinder, cap it and give yourself a "break". :)
SOURCE: i have a 92 chrsy. 5th ave with no antilock
If the pedal drops to the floor without you stepping on it or with very little effort then i would say bad booster or bad check valve on the vacuum line going to the booster. Hops this helps.
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