xjklmnop69
NAXJA Forum User
- Location
- MI
99 XJ
Jeeps been sitting all summer as I've replaced floor pans and rock sliders. Came back to her with no brakes
Pedal goes to the floor with minimal resistance, brakes were never excellent before but they'd hold enough to spin the rear tires
A few years ago I did the Liberty rear disc swap and the pedal feel got much stiffer over the drums although it stopped about the same
After this summer hiatus I came back bled all four corners with no air or improvement. I was hoping all the welding boiled some fluid in the hard lines. Went for the master cylinder after that. Bench bled until I saw no bubbles. Installed the new unit then bled all four corners again. Slightly better feel.. I think it was mental. Check all four calipers. Pistons go in and out easily, no leaks. Slide pins are working. No visible leakage anywhere in the system
If the Jeep is off, brake pedal feels excellent. Once I start her up, the pedal goes soft again. I started on a few other forums but never read any good final conclusions
The only parts still in question to me could be all the brake hoses, but I don't see any brake drag. I have one at each rear caliper, the hose from body to rear axle (a few years old), then the two front hoses. A lot to potentially go wrong and all at the same seems unlikely. Fluid is also going though the ABS module but not functioning (wasn't working years ago when I did the rear disc swap either). Is air getting trapped in the ABS?
Brake pedal feels like the lines are full of air when the engine is running but are rock solid when off
Any sugges0tions? :dunno:
Jeeps been sitting all summer as I've replaced floor pans and rock sliders. Came back to her with no brakes
Pedal goes to the floor with minimal resistance, brakes were never excellent before but they'd hold enough to spin the rear tires
A few years ago I did the Liberty rear disc swap and the pedal feel got much stiffer over the drums although it stopped about the same
After this summer hiatus I came back bled all four corners with no air or improvement. I was hoping all the welding boiled some fluid in the hard lines. Went for the master cylinder after that. Bench bled until I saw no bubbles. Installed the new unit then bled all four corners again. Slightly better feel.. I think it was mental. Check all four calipers. Pistons go in and out easily, no leaks. Slide pins are working. No visible leakage anywhere in the system
If the Jeep is off, brake pedal feels excellent. Once I start her up, the pedal goes soft again. I started on a few other forums but never read any good final conclusions
The only parts still in question to me could be all the brake hoses, but I don't see any brake drag. I have one at each rear caliper, the hose from body to rear axle (a few years old), then the two front hoses. A lot to potentially go wrong and all at the same seems unlikely. Fluid is also going though the ABS module but not functioning (wasn't working years ago when I did the rear disc swap either). Is air getting trapped in the ABS?
Brake pedal feels like the lines are full of air when the engine is running but are rock solid when off
Any sugges0tions? :dunno: