Tech Tip: Nissan Quest is Experiencing Brake Lock-Up

Tech Tip: Nissan Quest is Experiencing Brake Lock-Up

Contaminated brake fluid may have blocked the ABS modulator valves or the "dampener valve." The dampener valve is a component that is screwed into one of the outlet ports of the master cylinder. The brake line for the left-front and right-rear brakes come out of this part. Another possibility is that the ABS system component failure is causing brake pressure not to be released.

Application: Nissan Quest/Mercury Villager minivans with ABS (up to the 2002 model year). Master Cylinder 10-2637 and 13-2637.

Problem: Left front/right rear brake is locking up.

Cause: Contaminated brake fluid may have blocked the ABS modulator valves or the “dampener valve.” The dampener valve is a component that is screwed into one of the outlet ports of the master cylinder. The brake line for the left-front and right-rear brakes come out of this part. Another possibility is that the ABS system component failure is causing brake pressure not to be released.

Solution:

1. The first step is to examine the brake fluid condition for signs of debris and contamination; flush and replace the fluid, as needed.

2. Next, verify there are no ABS codes. Faulty wheel sensors (code 21) can cause false ABS actuator operation, resulting in wheel lock-up. Repair or replace as necessary, then clear ABS codes and verify operation.

3. Before replacing the master cylinder, the dampener valve or the ABS actuator, loosen the master cylinder so it can be pulled away from the brake booster to eliminate the possibility of brake pedal free play or a pushrod adjustment problem.

While this type of problem usually affects all four brakes, it does allow the master cylinder and linkage to be isolated. If the brakes still do not release, loosen the brake line from the dampener valve and verify that the brakes free up. If the brake fluid pressure is not releasing on its own, this may indicate a problem in the ABS actuator or the dampener valve that is blocking the release of brake fluid pressure back to the reservoir.

In most cases, the cause of the lock-up is the accumulation of debris and contamination that is affecting the operation of the ABS unit or the dampener valves. Proper periodic flushing and replacement of the brake fluid will help avoid this lock-up problem.

Courtesy of CARDONE Industries, Inc.

You May Also Like

Axle Torque Procedures

Guessing the correct torque setting is a bad idea.

The physics of all threaded fasteners are the same. As the bolt and nut are turned, the spiral threads convert rotational force into a linear force that creates clamping loads. When a threaded fastener is tightened, it stretches. Since metal is elastic, even greater clamping loads are generated. The threads also generate friction that keeps the assembly together. This especially applies to wheel bearings and axle nuts.

Gen 1 Wheel Bearings

Removing and installing these bearings requires the correct tools and patience.

Tapered Wheel Bearings

Here’s what you should know as a technician when servicing tapered wheel bearings.

Understanding Passive Wheel Speed Sensor Operation

Passive types of wheel speed sensors are still used in many applications so understanding their operation is important.

Threadlocking Compounds For Vehicle Corners

To get the most out of these “liquid” tools, you first need to know how they work.

Other Posts

Please Take Our Brakes/Rotating Electrical Survey

By entering, you’ll have a chance to win a $100 gift card or one of 10 $25 gift cards!

April’s ShopOwner Brings May Business Success

Read the new edition online now for solid business, technical and management information for your shop.

Read the March ShopOwner Digital Edition Now

Each issue is free to download and read, priceless in business value for your operation.

Benefits of Using Brake Parts Designed to Work Together

When replacing brake system components, it might seem like using compatible parts from any manufacturer – regardless of brand – should get the job done. However, for the safest brake job with the best performance, it’s always best to use parts from the same manufacturer, like ADVICS, where our brake pads, brake rotors, hydraulics, calipers