Disconnect diagnostic lead from diagnostic unit. Connect test box to control module. Clean area around brake hose and brake line connections on hydraulic modulator and clutch master cylinder. The main cause of these issues is the valve seats and pintles can become stuck or not seat properly due to debris, corrosion or contaminated brake fluid. The Dealer couldn't find anything wrong but recommend that they change the master cylinder, which I replaced about 6 months ago, and the two rear brake calipers because they were known to give trouble.
If wiring is okay, replace combination relay. Depress brake pedal as far as possible and hold in place. Removal 1 Turn ignition off. When vehicle is driven, control module checks that it is receiving signals from wheel sensors. If equal continue to next step. Note the pressure readings, under this pedal force the front pressures should not be over 500psi in most vehicles.
If one reading is incorrect, replace hydraulic modulator. When finished, disconnect the scan tool and proceed. Ensure diagnostic lead is removed from diagnostic unit. Connect a jumper wire between connector terminals No. If ohmmeter indicates 10-40 ohms, go to next step. If no short is present, replace combination relay. .
The outlet valve is normally closed. Remove 3 brake lines on side of hydraulic modulator. If voltmeter does not indicate battery voltage, ensure fuse and wiring do not have an open circuit. Connect a jumper wire between test box terminals No. If voltmeter does not indicate battery voltage, check fuse and wiring for an open circuit. Disconnect hydraulic modulator-to- combination relay 4-pin connector. Leaks in the hoses are not uncommon, and the symptoms created may appear as serious transmission problems.
Hold button down for at least 5 seconds and then release. If pump motor operates, leave jumper wires in place and go to next step. Left Front 1-2-2, 2-1-2, 2-2-2, 3-1-2, 3-2-2 ………… Right Front 1-2-3, 2-1-3, 2-2-3, 3-1-3, 3-2-3 …………. The metering valve helps provide balanced braking. Ohmmeter should indicate 45-90 ohms. If warning light does not come on, check if bulb is okay.
If warning light is on, do not drive vehicle. If battery voltage is present, go to next step. Connect a voltmeter between test box terminals No. In many cases, however, mechanical and electrical methods cannot provide a practical power transmission solution. If ohmmeter indicates continuity, replace wheel sensor. Solenoid Valve Symptoms These systems can become contaminated from metals like copper and debris flowing in old brake fluid.
Finally got the shop manual from Faxon. Remove 4 hydraulic modulator mounting bolts. If brake warning indicator does not light when ignition is turned on, go to next step. If voltmeter indicates battery voltage, go to next step. Clean area around sensor connector, then disconnect connector. If any wheels start to lock, control module activates hydraulic modulator which adjusts hydraulic pressure. The web-site describes testing, research, and design facilities and services, instructional videos, books, and software, all geared toward electro-hydraulic system design.
If ohmmeter indicates continuity, check wiring for a short to ground or voltage. Connect hose to bleed screw on either rear wheel. Connect jumper wire between test box terminals No. Connect voltmeter between text box terminals No. When a wheel begins to skid, the system senses the rotational speed of the wheel speed sensor and makes decisions whether to hold or release pressure to the brake circuit. Establishing the ground rules The power unit used as the subject of this report is drawn in hydraulic schematic form below. If all resistance readings are to specification, go to next step.
If one reading is incorrect, replace combination relay. The load consists of a time varying, but programmable, load flow. The spongey pedal happened to us repeatedly, complete pedal to the floor brake failure happened to us more than once. Panic braking is generally considered to start at about 600psi. The main cause of these issues is the valve seats and pintles can become stuck or not seat properly due to debris, corrosion or contaminated brake fluid.
If ohmmeter indicates no continuity, ensure brakelight contact is operating. This is confirmed by a signal from rotation sensor. Diode tester should indicate no continuity. If wiring is okay, replace hydraulic modulator. If ohmmeter does not indicate zero ohms, replace hydraulic modulator. Place rags under valve to protect paint.