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Is it harmful to add power steering fluid to brake fluid?

1 Answers

GabrielaMarie

07/30/25 9:32am

Yes, it is harmful and affects driving safety. Immediate replacement is required. Brake fluid and power steering fluid are different and serve completely different purposes. Automobile "brake fluid," also known as "hydraulic brake fluid," is the liquid "medium" used to transmit braking pressure in the hydraulic braking system of a vehicle. Power steering fluid, also referred to as "steering assist fluid" or "steering gear oil," is the hydraulic transmission oil used in the steering system. Power steering fluid has higher viscosity, poor fluidity, a distinct odor, and certain corrosive properties. Specific details are as follows: 1. Similarities: (1) Both are hydraulic transmission oils. (2) Strict requirements for "stability" when operating at high or low temperatures, such as no vapor lock and stable performance under harsh conditions. (3) Minimal (or delayed) corrosion effects on metals and rubber. 2. Differences: (1) Lubrication: Brake fluid does not have lubrication functions, whereas power steering fluid not only transmits hydraulic pressure but also lubricates gears, bearings, etc. (2) Temperature resistance: Brake fluid range: -40°C to 288°C. Power steering fluid range: -40°C to 170°C.

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