Proportion valve is alowing fluid to the front brakes but not the rear.replaced valve,could it be a sensor?

Resetting a proportioning valve in a 2001 Ford Explorer typically involves bleeding the brake system to ensure proper brake pressure distribution. The proportioning valve adjusts the amount of brake pressure sent to the front and rear brakes to optimize braking performance. If you're experiencing brake-related issues or have replaced brake components, bleeding the brake system can help reset the proportioning valve. Here's how to do it:
**Tools and Materials Needed:**
- Brake fluid
- Jack and jack stands
- Wheel chocks
- Wrenches
- Brake bleeder kit or clear plastic tubing
**Steps:**
1. **Safety Precautions:**
- Park the vehicle on a level surface and engage the parking brake.
- Use wheel chocks to prevent the vehicle from rolling.
- Wear appropriate safety gear, including gloves and eye protection.
2. **Prepare the Vehicle:**
- Loosen the lug nuts on all four wheels, but do not remove them completely.
3. **Jack up the Vehicle:**
- Use a jack to lift the vehicle off the ground. Secure it with jack stands for safety.
4. **Bleeding Sequence:**
- Start with the brake caliper or wheel cylinder that is farthest from the master cylinder. In most cases, this would be the right rear wheel.
5. **Bleeding Process:**
- Have a helper pump the brake pedal several times and then hold it down.
- Loosen the bleeder valve on the brake caliper or wheel cylinder.
- Fluid and air bubbles should come out. Tighten the valve before your helper releases the brake pedal.
- Repeat this process (pumping, holding, opening, and closing the valve) until you see clear brake fluid without air bubbles.
6. **Repeat the Process:**
- Move to the next farthest brake caliper or wheel cylinder (left front, right front, left rear) and repeat the bleeding process.
7. **Check Brake Fluid Level:**
- Keep an eye on the brake fluid reservoir while bleeding. Make sure it doesn't run dry, as this can introduce air back into the system.
8. **Top Off Fluid:**
- After bleeding all the brake components, top off the brake fluid reservoir with fresh brake fluid to the recommended level.
9. **Test Brakes:**
- Lower the vehicle, tighten the lug nuts, and then fully tighten them in a crisscross pattern.
- Test the brakes to ensure they feel firm and responsive.
Bleeding the brake system is an important maintenance task, especially after working on the brakes or if you're experiencing spongy brakes. If you're unsure about the process or want to ensure proper brake system maintenance, consider seeking assistance from a professional mechanic.

To my knowledge, the porportioning valve can't be bled using the ABS bleed feature of a scan tool and has to be manually bled.

The brakes will need to be bled normally, and GM has a depressor tool specifically made to be installed on the valve while bleeding the brakes: J-39177.

You'll have to bleed the front and rear brakes as normal, but with the tool installed in order to remove the air trapped in the valve.

There is no reset on them. What will work sometimes is to completely remove the brake light switch assembly from the valve and slowly push and release your brake pedal a few times. Then reinsert your brake light switch. If this doesn't work you will have to replace the proportioning valve. New price will likely scare you so head for the scrapyard.

None of those things . Just bleed the brakes normally starting from the longest line and ending with the shortest. The proportioning valve will always let brake fluid through, just not enough to lock up the rear brakes until you press heavy on the pedal . It is there so that full pressure to the large front brakes is reduce in proportion to the smaller rear brakes.

Front brakes require different fluid pressure than the rear, as more of the braking is done by the front brakes, because of vehicle weight shifting forward during braking, etc.

Proportioning valves are used in cars to reduce the fluid pressure to the rear brakes, to reduce rear wheel lock-up.

What happens when you try to bleed the rear brakes? If nothing comes out, trace each line back toward the proportioning valve--something would be blocking flow of fluid. Disconnect each line at the forward end and see if fluid comes out of the valve openings. You will need a scan tool to complete the bleeding process with ABS. Suggest buying a Chilton's manual for this truck because of the complexity of the ABS system.

You have a proportioning valve stuck. From the master the brake lines will run down the wheel well to another valve then out to the front calipers and rears when the prop valve sticks or freezes it then causes the rear or front system to lock up or not proportion the system evenly. 2. If that is not the case you may have contamination in the lines or the rubber brake hoses whick allow fluid to pass through it will not allow it to return almost acting like a back check valve therefore keeping you brakes on.

here is a 96 taurus


Item Part Number Description 1 2C296 Anti-Lock Brake Tube 2 2C219 Anti-Lock Brake Module 3 2005 Power Brake Booster 4 2263 Front Brake Tube 5 2B091 Brake Pressure Control Valve 6 2140 Brake Master Cylinder 7 2B547 Brake Load Sensor Proportioning Valve 8 N802191-S60 Bolt 9 2L568 RH Rear Brake Tube 10 2L569 LH Rear Brake Tube 11 2C287 Brake Fluid Distributor Tube 12 N808531-S301 Bolt 13 — Front Side Member 14 N802324-S56 Bolt 15 18124 Front Shock Absorber 16 2B121 Front Disc Brake Caliper 17 2078 Front Brake Hose 18 2264 Front Brake Tube 19 2553 Rear Disc Brake Caliper 20 2A442 Rear Wheel Brake Hose 21 N808728-S60 Bolt 22 — Side Rail 23 N802324-S60 Bolt
Brake Load Sensor Proportioning Valve


Item Part Number Description 1 2B547 Brake Load Sensor Proportioning Valve 2 — Body 3 N802191-S56 Bolt (2 Req'd) 4 2L568 Brake Tube Assy 5 2L569 Brake Tube Assy 6 2265 Brake Tube Assy 7 2B255 Brake Tube Assy 8 5500 Rear Suspension Arm and Bushing 9 W611634-S301 Bolt A — Tighten to 11.4-15.6 Nm
(8-12 Lb-Ft) B — Tighten to 10-14 Nm (7-10 Lb-Ft)

Brake Hose, Rear —Drum


Item Part Number Description 1 — Rear Side Rail 2 2L569 Rear Brake Tube 3 N602324-S60 Screw 4 N611193-S60 Screw 5 2C023 Left Hand Rear Hose and Connector 6 2210 Rear Drum Brake Backing Plate 7 18125 Rear Shock Absorber 8 2267 Rear Brake Tube A — Tighten to 16-20 Nm (12-15 Lb-Ft)

the stratus is know for clasped rear brake hoses .This stops the flow off brake fluid. try opening the brake lines at the master cylinder that go to the rear.pump up brakes first! if you got fluid than check the brake line if this is rear disc brakes on the line at the rear will be a built in proportioning valve.if drum loosen rubber hose line before the rubber part to see if you have fluid. If you do replace the brake hose! On you 74 challenger by the way i love dodge! any way on the valve there is a small button on the front of the proportioning valve that pops out it needs to be tap in lightly. also hit the brake peddel kind of hard a couple off times if that doesn't work. thanks for your question


p.s that hex bar on the is a junction not a proportioning valve .