Took my 93' Toyota to my mechanic several times, has 193,000 miles replaced the master cylinder twice because of the brakes either was soft then it gets hard again and locks up..tried bleeding ..getting it adjusted ..still has the same problem..what other causes that would do that?My mechanic replace the porporting valve, had the brake booster done before and in between all this..he is baffled of what is causing all 4 brakes to lock up after driving it aorund...it is like whent he car is cold when you first start it ..brakes are soft...then later driving around, when ti brakes it starts to get hard a bit more and then it would slowly lock up and stop..
THE MASTER CYLINDER NEED TO BE BLED FIRST.BEFORE PUTTING ON THE CAR.TO MANUAL BLEED BRAKE SYSTEM.YOU NEED 2 PEOPLE TO DO A BETTER JOB.YOU FIRST BLEED THE LEFT REAR RIGHT REAR LEFT FRONT AND RIGHT FRONT. WHEN YOU BLEED THE BRAKES.HAVE THE HELPER PUMP BRAKES 3 PUMPS.AND HOLD BRAKE PEDAL IN.YOU NEED A CLEAR BLEEDER HOSE IN A CLEAR BOTTLE HALF WITH CLEAN BRAKE FLUID. WITH BLEEDER HOSE ON BLEEDER SCREW AND OTHER END BLEEDER HOSE IN BOTTLE OF BRAKE FLUID.WHILE HELPER PUMP BRAKE PEDAL HOLD IT IN OPEN BLEEDER SCREW 1/4 TURN ALLOWING AIR BUBBLES LEAVE THE BRAKE SYSTEM.CLOSE THE BLEEDER SCREW BEFORE BRAKE PEDAL RELEASE.HAVE HELPER PUMP BRAKE PEDAL 3 TIMES. WITH PEDAL HELD DOWN OPEN BLEEDER SCREW GETTING AIR OUT OF THE SYSTEM.WHEN YOU SEE SOLID FLUID COMING OUT OF BLEEDER HOSE THE AIR IS OUT THE BRAKE SYSTEM.DONT DRIVE CAR ON HIGHWAY IF YOU STILL CANT GET SOLID BRAKES. HAVE CAR TOWED IN TO BE PRESSURE BLEED.
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