Question about 1997 Toyota 4Runner

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4runner rear brake fluid distribution valve - 1997 Toyota 4Runner

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Posted on Jan 02, 2017

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SOURCE: toyota 4runner brake

Did you replace these all by yourself or have them installed ?
Brake master cylinder has to be bench bled and the entire system has to be bled when installed. Or there will never be any brakes. If this is not the problem I need more information in order to diagnose correctly.

Posted on Oct 23, 2008

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SOURCE: Hw to change 97 4Runner´s brake fluid?

There is a little nipple looking valve on the caliper.. unscrew that and press on the brake. when all fluid is gone fill resivoir back up and bleed the brakes

Posted on Sep 30, 2009

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I changed the front brake pads and now have no pressure when i press the brake peddal. the master cylinder is full but still no pressure. what did i do wrong?


You may not have done anything wrong. You won't have any pressure the first couple of times that you press the brake pedal. Try pumping the brakes a few times. When you change the pads you have to open the caliper all the way up to get the caliper back on. When you press the brake the pads won't go all the way to the caliper on the first couple of times you press the brake. But once you pump the pedal, it should build up pressure. If not you will have to bleed the brakes.

Nov 29, 2010 | 1995 Toyota 4Runner

1 Answer

2005 jeep grand cheroke limited with A hemi, been to the dealer more times then I can count, and still to this day the same problem. The service elect brake system light illuminates intermit and so for...


The braking force of the rear wheels is controlled by electronic brake distribution (EBD). The EBD functions like a rear proportioning valve. The EBD system uses the ABS system to control the slip of the rear wheels in partial braking range. The braking force of the rear wheels is controlled electronically by using the inlet and outlet valves located in the HCU. The HCU is a Hydraulic control unit. The HCU consists of a valve body, pump motor, and wire harness.

Did they check for DTC (diagnostic trouble codes) in the system? if so, what were they?

Accumulators in the valve body store extra fluid released to the system for ABS mode operation. The pump is used to clear the accumulator of brake fluid and is operated by a DC type motor. The motor is controlled by the ABM.
The valves modulate brake pressure during antilock braking and are controlled by the ABM.
The HCU provides four channel pressure control individually to all the front and rear brakes. Each of the four channels control the rear & front wheel brakes individually.
During antilock braking, the solenoid valves are opened and closed as needed. The valves are not static. They are cycled rapidly and continuously to modulate pressure and control wheel slip and deceleration.
During normal braking, the HCU solenoid valves and pump are not activated. The master cylinder and power booster operate the same as a vehicle without an ABS brake system.
During antilock braking, solenoid valve pressure modulation occurs in three stages, pressure increase, pressure hold, and pressure decrease. The valves are all contained in the valve body portion of the HCU.


PRESSURE DECREASE The outlet valve is opened and the inlet valve is closed during the pressure decrease cycle.
A pressure decrease cycle is initiated when speed sensor signals indicate high wheel slip at one or more wheels. At this point, the ABM closes the inlet then opens the outlet valve, which also opens the return circuit to the accumulators. Fluid pressure is allowed to bleed off (decrease) as needed to prevent wheel lock.
Once the period of high wheel slip has ended, the ABM closes the outlet valve and begins a pressure increase or hold cycle as needed.


PRESSURE HOLD Both solenoid valves are closed in the pressure hold cycle. Fluid apply pressure in the control channel is maintained at a constant rate. The ABM maintains the hold cycle until sensor inputs indicate a pressure change is necessary.


PRESSURE INCREASE The inlet valve is open and the outlet valve is closed during the pressure increase cycle. The pressure increase cycle is used to counteract unequal wheel speeds. This cycle controls re-application of fluid apply pressure due to changing road surfaces or wheel speed.

Nov 09, 2010 | 2005 Jeep Grand Cherokee

2 Answers

What is a load proportioning valve


A load proportioning valve is a valve that is used in the brake system that uses an arm attached to the suspension in the rear and as the vehicle is loaded, the arm allows the valve to allow more brake fluid pressure to flow through to even the braking and cause the vehicle to stop more effectively even when there is more weight in the back. Usually used on pick ups.

Aug 14, 2010 | 1998 Toyota Corolla

1 Answer

Where is the proportioning valve located for the brake system?


It is right in front of your brake booster with the reservoir on top of it, it is the metal thing with about 9 brake lines coming out of it. It distributes the fluid front and rear. That is most cars anyway, yours may be different. Hope this helps.

Mar 10, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

Hw to change 97 4Runner´s brake fluid?


There is a little nipple looking valve on the caliper.. unscrew that and press on the brake. when all fluid is gone fill resivoir back up and bleed the brakes

Sep 30, 2009 | 1998 Toyota 4Runner

2 Answers

I put new brakes and rotors on the front of my Toyota 4Runner and new rear wheel cylinders on and I bled the brakes but there still seems to be air in them. What can be the problem


You are correct there is still air in the system. It is a two man job starting at the right rear and then left then front. Pump brake pedal then hold down while bleeder is opened then closed before pedal let off. Then repeat till no air. Be sure to check master cyl for fluid and keep it filled during process.

Sep 14, 2009 | 1996 Toyota 4Runner

1 Answer

Brake fluid leaking from ABS distribution block


You have to replace the master cylinder because the fluid that leaks from it is getting into the brake booster and compromising the seals. So you can probably get away with the booster and cylinder. Unless the ABS unit is a part of the either of the affected parts, or isn't working properly, you can leave it alone. ---------------------
A fluid-distribution system includes a plurality of fluid-distribution nodes with three-way ports attached to bleed/flush lines and alternate ports attached to vacuum lines. A first pump is used to draw new brake fluid from a new fluid container, push it through the manifold and ports, and through the bleed/flush lines. Fluid flow through the ports is selectively controlled by a computing device. In this manner, a vehicle's brake system including individual brake lines and ABS systems, may be flushed in a prescribed sequence. The vacuum lines are connected to a second pump via alternate ports of the sequential control valve manifold and may be used evacuated air and contaminated brake fluid from the vehicle's bleeder valves or master cylinder. Additionally, the bleed/flush lines may be connected to the alternate ports during priming or purging of the system. This also facilitates storage of the bleed lines as it prevents brake fluid from spilling and prevents air from entering the system. thanks.

Jul 11, 2009 | 2000 Mercury Cougar

1 Answer

I have bleed rear breaks.I cant seem to get fluid to rear.The ABS light is on along with the break light.Is it possible that there is a faulty ABS sensor not allowing fluid to be distributed to the rear...


I'm confused, how did U bleed the rear brakes and there's no fluid to them? first of all U need to get fluid to the rear.

  1. Make sure there fluid in the brake reserve
  2. leave the cap off the reserve
  3. crack open the furthest bleeder valve till fluid come out (take it off if U have 2)
  4. if nothing still come out, then U have a clogged brake line
  5. blow back through the line from the brake side (slow till it bubbles back through the reserve
  6. then gravity bleed it, tighten up the the valve
  7. now U can bleed the brakes

May 04, 2009 | Pontiac Grand Am Cars & Trucks

1 Answer

97 4runner---brakes locking up


your rear hub seals are leaking, which leak grease/hub fluid in to the drums which will make them stick.

Mar 02, 2009 | 1997 Toyota 4Runner

2 Answers

1990 4Runner bakes are soft


soft(low) brake pedal has 5 possible cause
1 air in system
2master cylinder bypass
3fluid leak
4rear brake shoes out of adjusmet(too far from drum)
5spongy brake pads
if there is no leak and the fluid is at level I would adjust rear brakes and bleed system.If that did not work replace master cylinder.

Jan 20, 2009 | 1990 Toyota 4Runner

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