Which of the following statements regarding the performance, construction, and operational characteristics of oil-immersed multi-disc wet brakes used in agricultural tractors is/are CORRECT?
Options:
(A) Oil-immersed brakes offer superior heat dissipation, virtually eliminating brake fade during prolonged heavy downhill hauling
(B) The circulating oil continuously washes away friction wear particles, providing significantly longer service life than dry shoe brakes
(C) Independent left and right brake pedals can be unlatched in the field to assist in making tight headland pivot turns
(D) Oil-immersed wet brakes have a strictly higher static coefficient of friction than dry friction materials
Answer Key:
A, B, C
Step-by-Step Solution & Explanation
- **A is correct:** Wet brakes dissipate heat into the transmission oil bath, preventing high thermal fade.
- **B is correct:** Sealed oil circulation flushes away debris and minimizes abrasive lining wear.
- **C is correct:** Independent left/right braking locks the inside drive wheel to achieve near-zero turning radius at headlands.
- **D is incorrect:** The presence of oil lubrication lowers the coefficient of friction (typically $\mu \approx 0.08\text{--}0.12$ for wet discs versus $\mu \approx 0.3\text{--}0.4$ for dry linings), which is compensated by utilizing multiple friction discs and hydraulic actuation pressure.