What is the difference between a straight push master cylinder and a side push master cylinder?

1 Answers
Thompson
07/30/25 5:31am
Straight push master cylinder and side push master cylinder differ as follows: Safety aspect: The straight push master cylinder is used to store brake fluid. When braking, operating the brake lever generates hydraulic pressure, which drives the slave cylinder to press the brake friction pads, clamping the brake disc on the front wheel to achieve braking. The transparent window next to the master cylinder is used to observe the brake fluid. The fluid level should reach half of the window, or as long as the fluid is visible, it is sufficient. Feel difference: There is a significant difference in feel. With the straight push, when the lever is pressed downward, the piston moves in the same direction, and the ratio between input and output is constant. The braking force increases proportionally with the amount of hand pressure applied. In contrast, with the side push, when the lever is pressed downward, the piston moves at an angle close to 90 degrees, resulting in a non-fixed ratio between input and output, which causes issues with the feel.
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