Cleaning Operations For ZF Brake Systems

The cleanliness of accessories will directly affect its service life and performance. For example, poor cleanliness of brake parts will affect the braking effect. In severe cases, it may directly lead to brake failure.
So how to clean accessories efficiently, here are the following operating points:
 
1. Cleaning The Brake Caliper Bracket
When the chute of the brake caliper bracket is rusted or too dirty, the brake pads cannot return smoothly, causing brake adhesion and causing dark spots on the brake disc due to local overheating.
 
Method:
You need to use a metal brush to vigorously scrub away dirt and rust on the bracket, and then clean it thoroughly with brake system cleaner. 2. Clean Wheel Bearings
Why do wheel fastening bolts that are tightened to the specified torque still come loose often? This may be caused by corrosion of the wheel bearings. The solid rust between the brake disc and the wheel hub bearing mounting surface gradually decomposes into dust during vehicle driving, which may change the set torque of the wheel bolts, causing the wheel bolts to loosen. To avoid this, the contact surface between the brake disc and wheel bearing needs to be completely cleaned of dirt and corrosion.
 
Method:
First use a wheel hub brush to remove rust.
Second, use detergent to thoroughly clean the hub bearing contact surface to prevent brake dust, ensure installation tolerance, and avoid brake chatter.
Third, check the studs or threaded holes of the wheel hub bearing for corrosion and damage. If necessary, be sure to clean or even replace the wheel hub bearing with a new one.
 
If the vehicle has brake shudder, the circular runout of the wheel hub bearing end surface should be detected after cleaning, and refer to the limit value specified by the automobile manufacturer to ensure that the mounting surface is flat enough. 3. Clean The Brake Caliper Guide Pin
Inspection and cleaning of the caliper guide pin are also very important, related to whether the brake caliper can be released smoothly.
 
Method:
First, you need to check whether the guide pin can move smoothly in the axial direction, whether there is any gap in the radial direction, and whether the removed guide pin is bent and deformed. If it is found that the guide pin is difficult to rotate, the radial clearance is too large, or the dust cover is damaged, it must be replaced.
 
Then, use a metal brush or sandpaper to remove the rust, and finally clean it thoroughly with a cleaner.
 
Special Note！
To allow the guide pin to move freely, never use rust removers containing mineral oil, as this will cause the rubber boot to expand and cause damage! 4. Clean The Inside Of The Wheel Hub And Install It
The mounting surface on the inside of the wheel hub that is in contact with the brake disc also needs to be kept clean and free of rust. Otherwise, an excessively dirty wheel hub may not only cause brake chatter, but also cause the brake disc to deform.
 
Method:
You can use a wheel hub brush to clean it.