Failed Brake Booster Seal Causes Master Cylinder Leak

Failed Brake Booster Seal Causes Master Cylinder Leak

Chronic master cylinder failure due to fluid leaking past secondary seal in the master cylinder bore. A defective master cylinder pushrod seal in the power brake booster allows vacuum to draw fluid past secondary seal of the master cylinder.

brake-master-cylinder-booster-featured

Problem: Vehicles equipped with power brake booster assemblies fail.

Cause:  Chronic master cylinder failure due to fluid leaking past secondary seal in the master cylinder bore. A defective master cylinder pushrod seal in the power brake booster allows vacuum to draw fluid past secondary seal of the master cylinder.

Solution: Replace both master cylinder and power brake unit.

Note: When replacing brake components, always flush the entire brake system with approved brake fluid from a sealed container.

Courtesy of Cardone.

You May Also Like

Gen 1 Wheel Bearings

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

The most challenging wheel bearing to replace is a cartridge or press-fit, otherwise known as a gen 1 wheel bearing. No matter what you call them, gen 1 wheel bearings can be found on domestic and import nameplate vehicles. 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.

How Regenerative Brakes Operate

Regenerative braking is a hybrid’s first choice for braking.

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!

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

Tesla Wheel Bearing Replacement

The process of replacing the hub unit on a Tesla is the same as many cars and light trucks.

Brake Pad Edge Codes – What Can They Tell You?

The edge code is a language written by engineers, federal entities and industry associations.