Wheel Cylinder Assembly
This wheel cylinder assembly has its parts that we need to understand their functions. Please follow the parts below and see if I missed something and don’t hesitate to mention in the comment box what are your ideas. Let’s learn together by sharing our knowledge concerning this essential part of the brake system.
Dust Boot or Cylinder End Cap
These caps protect the cylinder from being filled with dust. It is important so the piston will stay clean and smooth in its movement. When there are no caps on both ends of the cylinder either, water, dust or mud will accumulate on the piston passage and it will cause corrosion on both the cylinder and the piston resulting in the oil leakage.
The cylinder pistons are responsible for pushing the cylinder cups. When the brake pedal is pushed it will also push the oil that will push the cups on both ends to give pressure to the brake linings against the brake drum.
When the return springs compress the brake shoe, the brake shoe will push the pushrod that will press the piston.
The cylinder cups are the ones that seal the brake fluid from leaking. Every time the brake is needed the cylinder cups move back and forth the cylinder. Let’s say the brake pedal is pressed then the brake fluid will be pressed inside the wheel cylinder. The oil will fill the cylinder but it will not burst out so it will press the cups outward pushing the pistons outward.
When these cups are perforated it will allow oil leakage and the brake can be less effective in halting the car.
The cup spring is responsible for pushing back the cups every time they are pressed. It also functions as the stabilizer of the cups so they’ll not flip inside the wheel cylinder.
The wheel cylinder breather screw is an important part of the wheel cylinder assembly. This is what you need when you fix the brake filled with air. It is not good and as effective when the brake fluid tube passages are filled with air. To remove the air inside the brake fluid tube passages, this breather screw does the job.
To remove the air inside fluid passages you need someone to assist you. One will pump the brake pedal and press it to the floor then one will loosen this screw to breathe out air. Temporarily tighten it and let the person pump again the brake pedal then press it to the floor until this screw is loosened again to release air. Do the procedure until the brake pedal becomes stiff enough and it will not reach the floor, that means all brake fluid is inside the tube passages.
Thank you for reading this post and I hope it gave you an idea of how this assembly works with the whole brake system.
I am happy if you would contribute your opinion regarding this discussion so we all could learn. Drop your comment on the comment box and I will be willing to respond to any questions.