Question about 2000 Hyundai Accent

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Is there a shut off safety valve for dual braking system

If rear wheel cylinder leaks is there a safety shut off valve and where is it to reset after repair

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  • yadayada
    yadayada Jun 02, 2010

    there is no such valve, what are you trying to do?? if u are trying to bleed the brakes u must have a special tool for the ABS hydraulic control unit that holds open the pressure valves inside the uniot to allow bleeding, there is no way around this.

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No safety shut off valve for brake's at all, wheel cylinder's will have to be replace or overhaul kits.

Posted on Jun 02, 2010

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I have an 01 GMC Jimmy 4.3L 4WD & we are trying to bleed the brakes but the scanner says my vehicle is going 3MPH so we manually bleed the brakes but the pedals still easily is pushed to the floor.


Bad master cylinder . What are you using a scan tool for ? No need Unless your Installing a new Electro-Hydraulic Control Unit (EHCU) or new Brake Pressure Modulator Valve (BPMV).
Hydraulic Brake System Bleeding (Manual)
Caution: Refer to Brake Fluid Irritant Caution in the Preface section.
Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in the Preface section.
Place a clean shop cloth beneath the brake master cylinder to prevent brake fluid spills.
With the ignition OFF and the brakes cool, apply the brakes 3-5 times, or until the brake pedal effort increases significantly, in order to deplete the brake booster power reserve.
If you have performed a brake master cylinder bench bleeding on this vehicle, or if you disconnected the brake pipes from the master cylinder, you must perform the following steps:
3.1. Ensure that the brake master cylinder reservoir is full to the maximum-fill level. If necessary add GM approved brake fluid from a clean, sealed brake fluid container. Refer to Fluid and Lubricant Recommendations.
If removal of the reservoir cap and diaphragm is necessary, clean the outside of the reservoir on and around the cap prior to removal.
3.2. With the rear brake pipe installed securely to the master cylinder, loosen and separate the front brake pipe from the front port of the brake master cylinder.
3.3. Allow a small amount of brake fluid to gravity bleed from the open port of the master cylinder.
3.4. Reconnect the brake pipe to the master cylinder port and tighten securely.
3.5. Have an assistant slowly depress the brake pedal fully and maintain steady pressure on the pedal.
3.6. Loosen the same brake pipe to purge air from the open port of the master cylinder.
3.7. Tighten the brake pipe, then have the assistant slowly release the brake pedal.
3.8. Wait 15 seconds, then repeat steps 3.3-3.7 until all air is purged from the same port of the master cylinder.
3.9. With the front brake pipe installed securely to the master cylinder, after all air has been purged from the front port of the master cylinder, loosen and separate the rear brake pipe from the master cylinder, then repeat steps 3.3-3.8.
3.10. After completing the final master cylinder port bleeding procedure, ensure that both of the brake pipe-to-master cylinder fittings are properly tightened.
Fill the brake master cylinder reservoir with GM approved brake fluid from a clean, sealed brake fluid container. Ensure that the brake master cylinder reservoir remains at least half-full during this bleeding procedure. Add fluid as needed to maintain the proper level.
Clean the outside of the reservoir on and around the reservoir cap prior to removing the cap and diaphragm.
Install a proper box-end wrench onto the RIGHT REAR wheel hydraulic circuit bleeder valve.
Install a transparent hose over the end of the bleeder valve.
Submerge the open end of the transparent hose into a transparent container partially filled with GM approved brake fluid from a clean, sealed brake fluid container.
Have an assistant slowly depress the brake pedal fully and maintain steady pressure on the pedal.
Loosen the bleeder valve to purge air from the wheel hydraulic circuit.
Tighten the bleeder valve, then have the assistant slowly release the brake pedal.
Wait 15 seconds, then repeat steps 8-10 until all air is purged from the same wheel hydraulic circuit.
With the right rear wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the right rear hydraulic circuit install a proper box-end wrench onto the LEFT REAR wheel hydraulic circuit bleeder valve.
Install a transparent hose over the end of the bleeder valve, then repeat steps 7-11.
With the left rear wheel hydraulic circuit bleeder valve tightened securely, after all air purged from the left rear hydraulic circuit, install a proper box-end wrench onto the RIGHT FRONT wheel hydraulic circuit bleeder valve.
Install a transparent hose over the end of the bleeder valve, then repeat steps 7-11.
With the right front wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the right front hydraulic circuit, install a proper box-end wrench onto the LEFT FRONT wheel hydraulic circuit bleeder valve.
Install a transparent hose over the end of the bleeder valve, then repeat steps 7-11.
After completing the final wheel hydraulic circuit bleeding procedure, ensure that each of the 4 wheel hydraulic circuit bleeder valves are properly tightened.
Fill the brake master cylinder reservoir to the maximum-fill level with GM approved brake fluid from a clean, sealed brake fluid container.
Slowly depress and release the brake pedal. Observe the feel of the brake pedal.
If the brake pedal feels spongy, repeat the bleeding procedure again. If the brake pedal still feels spongy after repeating the bleeding procedure, perform the following steps:
21.1. Inspect the brake system for external leaks. Refer to Brake System External Leak Inspection.
21.2. Pressure bleed the hydraulic brake system in order to purge any air that may still be trapped in the system.
Turn the ignition key ON, with the engine OFF. Check to see if the brake system warning lamp remains illuminated.
Important: If the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be driven until it is diagnosed and repaired.
If the brake system warning lamp remains illuminated, refer to Symptoms - Hydraulic Brakes

Feb 26, 2017 | GMC Cars & Trucks

2 Answers

I have 04 awd saturn vue my front driver and rear passenger brakes won't engage or something.


Make sure the master cylinder is full and that the vacuum line going to it is is secure wit no air leaks. If as you state the brakes not being applied only at the drivers front and passengers rear wheels, but the other two wheels are working fine you will either have a leaking/blocked master cylinder, leaking/blocked brake lines feeding each of those wheels, or a bad proportioning valve. To trouble shoot raise the bad wheel and crack open the bleeder valve, have an assistant apply the brakes if a nice clean steady stream of fluid comes out, MC is OK, and valve is OK, any bubbles of poor flow indicates leak in system. Very little flow bad MC or blocked lines/valve, etc.Do the same for the rear wheel and you should be able to determine the fault.

Feb 04, 2015 | 2004 Saturn VUE

1 Answer

What cause rear brake to stick?


Possible out of adjustment, bad proportioning valve, bad springs on brake shoes, shoes out of alignment, leaking wheel cylinder. Good luck

Apr 10, 2017 | 1990 Chevrolet C1500

1 Answer

I have a gq nissan patrol and only the front brakes are working


you will need to see if a) there is enough fluid in the system, b) that the fluid is getting to the rear, and c) there is not a mechanical issue at the rear itself.

A) open and see if the reservoir is full to the line on the side
B) check that the fluid is getting back there by cracking the lines open, starting from the back and working your way forward. (also look for cracked or leaking soft hoses while you are at it) <sometimes a very hard stop or leak can make the proportioning valve stick shut ( a safety feature to ensure that you still have SOME brakes)>
C) make sure that the rear brake assembly is still OK (good shoes, wheel cylinder(s) are working, drums not too eaten up, hardware not broken/ stuck/ missing)

Oct 11, 2011 | 1992 Nissan Pickup

1 Answer

1996 camery station wagon , 4 wheel disc brakes. need to replace brake lines in the rear. what is the name of the junction block , with the actuator in the rear? All 4 rear lines go to and leave this...


Hello, first you Toyota has dual braking system. It goes like this: Left front brake with right rear brake, the right front brake with left rear brake. This a braking safety system that has been incorporated in auto/trucks for a few years now. If brake line is broken. loose wheel caliper, blow caliper piston, any thing that happens to the brake system. You will still have two wheels that have their hydraulic system. Also, the emergency brake will a manual system for the rear wheels.


Why do you need to change your auto brake lines? That valve you are talking about is a load stabilizer valve. It used to limit the amount of hydraulic fluid as more load is place in the rear of your Toyota. Example. by press on the brake pedal, it activates hydraulic pressure to the four wheel disk braking system. The braking system needs to stabilize the hydraulic pressure to the wheel to keep the vehicle moving in a forward motions. Now, by loading the rear of the vehicle this transfer the load disposition of the vehicle by making it heaver in the rear. Therefore, the load compensator valve limit the amount of hydraulic pressure to the rear brakes.



Another thing to remember about this rear load valve, they will get plugged. and the vehicle will not have enough braking pressure for the rear wheels. I hope I answer you question about this load portion valve in the rear of Toyota. GB...stewbison

Sep 21, 2011 | 1996 Toyota Camry

4 Answers

Brake fluid coming out of rear wheel brake asembly


eddyblueange_0.pngeddyblueange_5.jpgthere is some pics from brake sistem maybe yours is little diferent but check the hose on the outside

Dec 29, 2010 | 2000 Volkswagen Beetle

1 Answer

Villager GE 95 liquid escape in a brake system


It is a brake load sensoing valve that applies more pressure to the rear brakes as you load the vehicle. It is $375 from tascafordparts.com. Get one from the junk yard or just bypass it.

usually just the lines are leaking and can be replaced.
Valve, Brake Load Sensor Proportioning The Villager has a brake load sensor proportioning valve (2B547) that is mounted on the vehicle frame and connected to the rear axle housing (4010) . When the vehicle is unloaded, the brake load sensor proportioning valve closes and partially reduces hydraulic pressure to the rear wheel cylinders (2261) . As the vehicle is loaded, the weight presses down the back end of the vehicle on the rear springs (5560) . This activates the brake load sensor proportioning valve which opens and supplies more hydraulic pressure to the rear wheel cylinders . When the vehicle is fully loaded, the brake load sensor proportioning valve is fully open and provides full hydraulic pressure to the rear wheel cylinders .
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Jun 26, 2010 | 1995 Mercury Villager

1 Answer

No fluid to rear brakes on a 1992 Lincoln Continental.  Rear brakes stopped working. Pulled rear wheels and found surface rust on disks. Raised car, spun tire and push brake pedal found no friction...


check at the proportioning valve--some have a pin that sticks out from the side, when bleeding the brakes try to push that pin back in. But first check to see why this happened--fluid leak to rear wheels, brake hoses cracked and air getting into the system??????

Jun 12, 2009 | 1992 Lincoln Continental

4 Answers

98 Dodge Ram 1500 brakes go completely to the floor.


How did you come to the conclusion that the master cylinder is ok? Does the level of brake fluid in the MCyl. rise & fall while pumping the brakes. I feel no fluid is entering the chamber which has the piston. This piston is directly connected with the brake pedal.Have it checked and the oil seal in it too.....sodeep

May 24, 2009 | 1999 Dodge Ram

2 Answers

Brake Leak


check the rear if you have drum to see if one of the wheel cylinder are leaking and and check out all of the brake line front to back put the car on ramp and put something behind the rear wheel for safety and then get a creeper and then you find .

Feb 08, 2009 | 1991 Buick Riviera

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