I have a 92 jeep wrangler.have replaced everything from brake booster to the pads,shoes have replaced all the lines on this also.have bled the brake system of all the air.still i have no pedal at all.can pump up the pedal and have very limited brake.what could be my problem???
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1: inspect all brake linings first.
no pulling left or right braking?
the car has 100% full manual brakes. if the brake booster fails.
(its only and assist !!! for 50lb small folks)
so does it? it takes more pedal pressure but has 100% full braking.
this is no accident its by design.
make sure none of the brake shoes/pads are soaked in DoT3/4 fluid
or grease or gear oil.
and no brake fluid leaks end to end, this is really #1 on all cars.
look, then look again. even behind and in front of the master cylinder.
look at tires (inside for fluid leaks>)
2: do the booster test. did the vacuum hose to it fall off?
or got pinched, or ?
google brake booster test
if ABS system. get it all checked,
if ABS get the ABS scanned.
if you cant stop correctly,,,,???? , dont drive.
get it fixed.
check or adjust brake pedal, check brake booster or replace new one, check pedal return spring and bushing, check all wheel cylinder or replace, check brake shoe or brake pad, check brake fluid or replace,.
You changed the master cylinder and vacuum booster and have no leaks anywhere, but did you bleed the entire brake system after you did this work? A little bit of air in any of the lines will make the brakes ineffective.
if you cant find any leaks in lines or cylinders or calipers u probaly have a bad booster
see lots come threw my shop like that but also their is a vacum line that runs to the booster and it hooks to a plastic valve that goes in to the booster those get gloged and you loose pedal as well try replacing that before you bye a new boooster
Try pumping pedal with booster vacuum line disconnected at booster, check if any fluid at vacuum connection. Do this with engine not running. Please let me know if pedal goes hard and fluid at vacuum port , if so booster is faulty