GENERAL INFORMATION
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1. Air in system.
WARNING
If the fluid level drops too low, air can enter the
hydraulic system through the master cylinder. Air
can also enter the system from loose or damaged
hose fittings. Air in the hydraulic system causes a
soft or spongy brake lever action. This condition
is noticeable and reduces brake performance.
When it is suspected that air has entered the
hydraulic system, flush the brake system and
bleed the brakes as described in Chapter Fifteen.
2. Low brake fluid level.
WARNING
As the brake pads wear, the brake fluid level in
the master cylinder reservoir drops. Whenever
adding brake fluid to the reservoir, visually check
the brake pads for wear. If it does not appear that
there is an increase in pad wear, check the brake
hoses, lines and banjo bolts for leaks.
3. Leak in the brake system.
4. Contaminated brake fluid.
5. Plugged brake fluid passages.
6. Damaged brake lever or pedal assembly.
7. Worn or damaged brake pads.
8. Warped brake disc.
9. Contaminated brake pads and disc.
WARNING
A leaking fork seal can allow oil to
contaminate the brake pads and disc.
10. Worn or damaged master cylinder cups and/or cylinder bore.
11. Worn or damaged brake caliper piston seals.
12. Contaminated master cylinder assembly.
13. Contaminated brake caliper assembly.
14. Brake caliper not sliding correctly on slide pins.
15. Sticking master cylinder piston assembly.
16. Sticking brake caliper pistons.
Brake Drag
When the brakes drag, the brake pads are not capable of moving away from the brake disc when the
brake lever or pedal is released. Any of the following causes, if they occur, would prevent correct brake
pad movement and cause brake drag.
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