MikeTassjeep10

1989 jeep cherokee xj,

This morning I started the jeep, went down the road and had really hard pressure in my brakes. When I came to a full stop that pressure broke and became really sloppy and barely any pressure at all. Check my master cyl and the levels were fine. Didn't see any leaking from the lines. My drums are stock on my jeep but I haven't had a problem. New front brakes on it last summer. Please help. Do you think it's my drums?

caged

sounds like your booster just took a dump.

first, look at your drums to see if there's fluid leaking.
then maybe pull your drums to see if anything let go.

also check fronts to see if working properly.

but i think you will need a new booster tho.

freegdr

booster goes bad pedal will be hard at all times. Check for leaking wheel cylinders and lines.

MikeTassjeep10

So booster or check for leaking wheel cylinders and lines?

freegdr

Leaks ....Same thing caged said.

RTorrez1

Also check the check valve on the brake booster the supplies the vacuum.