1. Introduction
The QPKING AS506 Brake Fluid Boiling Point Tester is a specialized automotive tool designed to accurately measure the boiling point of various brake fluid types. This device helps determine the condition of brake fluid by assessing its dry and wet boiling points, which is crucial for maintaining optimal braking performance and vehicle safety. It features dual-mode operation and supports a wide range of brake fluid specifications.
2. Safety Information
- Always wear appropriate personal protective equipment, such as safety glasses and gloves, when handling brake fluid.
- Brake fluid is corrosive and can damage paintwork. Avoid contact with vehicle surfaces.
- Ensure the device is connected to a 12V battery with correct polarity. The AS506 includes a battery reverse polarity protection device to prevent damage to the tester or vehicle in case of improper connection.
- Keep the test stick clean and free from contaminants to ensure accurate readings.
- Perform tests in a well-ventilated area.
3. What's in the Box
Upon unpacking your QPKING AS506 Brake Fluid Boiling Point Tester, please verify that all the following items are included:
- 1 x Brake Fluid Boiling Point Tester Main unit
- 1 x 50 ml Brake fluid sampler
- 1 x Sampler matching hose
- 1 x 50ml Beaker
- 1 x Manual
- 1 x Product Certification

4. Product Overview
The AS506 is a robust and efficient tool for assessing brake fluid quality. Key features include:
- Dual-Mode Options: Choose between "NORMAL MODE" for standard testing or "BRAND MODE" for specific brake fluid brands.
- Fast Testing: Provides accurate test results in approximately 16 seconds.
- Supports Various Brake Fluid Types: Compatible with DOT 3, DOT 4, DOT4+, DOT4ESP, DOT 5, DOT 5.1, DOT5.1ESP, ENV4, and ENV6.
- Battery Reverse Polarity Protection: Safeguards the device and vehicle from damage due to incorrect battery connection.


5. Setup
Before performing a test, ensure the device is properly set up:
- Prepare Brake Fluid Sample: Use the provided sampler to extract approximately 40-50ml of brake fluid from the vehicle's reservoir. Inject this sample into the provided beaker.
- Connect Power: Connect the device to a 12V vehicle battery using the alligator clips. Ensure correct polarity (red to positive, black to negative).

6. Operating Instructions
Follow these steps to perform a brake fluid boiling point test:
6.1. Mode Selection
The AS506 offers two testing modes:
- Normal Mode: For general testing of common brake fluid types (DOT3, DOT4, DOT5.1).
- Brand Mode: For specific brake fluid brands that may have unique boiling point characteristics. The device covers 14 leading brands.
Use the 'Tab' key on the device to select your desired mode.


6.2. Testing Procedure
- After preparing the sample and connecting power (as per Section 5), turn on the device.
- Select either "NORMAL MODE" or "BRAND MODE" using the 'Tab' key.
- If in Normal Mode, select the specific brake fluid type (e.g., DOT3, DOT4) using the 'Tab' key. If in Brand Mode, navigate through the listed brands to select the correct one.
- Immerse the test stick into the brake fluid sample in the beaker, ensuring the sampling hole is fully submerged.
- Press and hold the 'S' (Start) button for approximately 16 seconds. The device will display a progress bar and the current temperature.
- Once the test is complete, the device will display the Dry Boiling Point, Wet Boiling Point, and the final temperature.

6.3. Interpreting Results
The test results provide the Dry Boiling Point (for new brake fluid) and the Wet Boiling Point (for brake fluid in use). Compare these values to the reference table below to determine the condition of your brake fluid.
| Types | Dry Boiling Point (Brand new brake fluid) | Wet Boiling Point (Brake fluid in use) |
|---|---|---|
| DOT3 | 205°C / 401°F | 140°C / 284°F |
| DOT4 | 230°C / 446°F | 155°C / 311°F |
| DOT4+ | 230°C / 446°F | 155°C / 311°F |
| DOT5 | 260°C / 500°F | 180°C / 356°F |
| DOT5.1 | 270°C / 518°F | 190°C / 374°F |
A lower wet boiling point indicates higher water content in the brake fluid, which reduces its effectiveness and can lead to brake fade. If the measured wet boiling point is significantly lower than the reference value, brake fluid replacement is recommended.

6.4. Supported Brake Fluid Types
The AS506 tester is designed to work with a comprehensive range of brake fluid types, including:
- DOT 3
- DOT 4
- DOT4+
- DOT4ESP
- DOT 5
- DOT 5.1
- DOT5.1ESP
- ENV4
- ENV6
In Brand Mode, it supports 14 leading brands such as ATE, TRW, BOSCH, MOBIL, TOTAL, FUCHS, MOTUL, DELPHI, KUNLUN, FERODO, BREMBO, TEXTAR, MONARCH, and CHANGCHENG.

6.5. Product Video
7. Maintenance
- Cleaning: After each use, thoroughly clean the test stick with a clean cloth to remove any brake fluid residue. This prevents contamination and ensures accurate future readings.
- Storage: Store the device in a dry, cool place, away from direct sunlight and extreme temperatures. Keep it in its original packaging or a protective case to prevent damage.
- Battery: If the device will not be used for an extended period, remove the battery to prevent leakage.
8. Troubleshooting
- No Power: Check the 12V battery connection. Ensure the alligator clips are securely attached to the correct terminals. Verify the vehicle battery has sufficient charge.
- Inaccurate Readings: Ensure the test stick is fully immersed in the brake fluid sample. Clean the test stick thoroughly before each use. Verify the correct brake fluid type or brand is selected in the device settings.
- Test Not Completing: Ensure the 'S' button is held for the full 16 seconds. Check for any error messages on the display.
9. Specifications
| Specification | Value |
|---|---|
| Working Voltage | 12V (minimum 10V) |
| Detection Time | 16 seconds |
| Working Temperature Range | 0°C ~ 50°C |
| Wet Boiling Point Range | 140°C ~ 205°C (284°F ~ 401°F) ±5% |
| Dry Boiling Point Range | 160°C ~ 320°C (320°F ~ 608°F) |
| Main Unit Dimensions | Ø88mm x 146mm |
| Package Weight | 0.6kg |

10. Warranty and Support
QPKING offers comprehensive support for your AS506 Brake Fluid Boiling Point Tester:
- Three Years Warranty: For damage caused by non-human factors, QPKING promises to resend parts for free within 3 years from the date of purchase.
- Lifetime Maintenance: The product is covered by lifetime maintenance.
- Customer Support: For any needs or inquiries, you are welcome to contact QPKING customer service. They aim to respond within 24 hours.