mhead
NAXJA Forum User
- Location
- Encinitas, CA
Hi All,
I replaced the master brake cylinder last week in my '92 XJ 4.0 I-6 auto tranny 4X4. This vehicle has anti-lock brakes. I did the usual replacement for a MBC: remove the old MBC, swap the plastic tank, bench blead, install, blead brakes at wheel cylinders beginning with the passenger rear and working to the driver front. I didn't do anything special for the antilock system. Worked great, brakes feel fine, no warning lights.
Trouble is three times now the brakes have stayed on. Most recently I was backing out of a parking space, applying the brakes gently. They suddenly seemed to be applied harder. The vehicle became difficult to back or go forward. The brake pedal felt very high and stiff. I jacked each wheel off the ground. With the engine off and the vac hose disconnected from the booster unit, each wheel was siezed. Wheels were cool to the touch.
I released hydraulic pressure in both front and rear systems by loosening the nut holding the steel tube to each of the two ports on the master brake cylinder, then re-tightened. Normal braking operation returned and I drove the vehicle home without further incident.
Did I miss some special thing about the ABS when I swapped the MBC? Anyone had this problem before?
Thanks!
Mike
I replaced the master brake cylinder last week in my '92 XJ 4.0 I-6 auto tranny 4X4. This vehicle has anti-lock brakes. I did the usual replacement for a MBC: remove the old MBC, swap the plastic tank, bench blead, install, blead brakes at wheel cylinders beginning with the passenger rear and working to the driver front. I didn't do anything special for the antilock system. Worked great, brakes feel fine, no warning lights.
Trouble is three times now the brakes have stayed on. Most recently I was backing out of a parking space, applying the brakes gently. They suddenly seemed to be applied harder. The vehicle became difficult to back or go forward. The brake pedal felt very high and stiff. I jacked each wheel off the ground. With the engine off and the vac hose disconnected from the booster unit, each wheel was siezed. Wheels were cool to the touch.
I released hydraulic pressure in both front and rear systems by loosening the nut holding the steel tube to each of the two ports on the master brake cylinder, then re-tightened. Normal braking operation returned and I drove the vehicle home without further incident.
Did I miss some special thing about the ABS when I swapped the MBC? Anyone had this problem before?
Thanks!
Mike