Select your vehicle brand and the topic you are interested in.
Brake fluid
Brake fluid
Brake fluid transmits hydraulic pressure to the brakes. The correct specification, level and condition are essential for safe braking. During routine service, J&S SERVIS checks the level and measures the brake fluid boiling point.
Which fluid belongs in Volkswagen Group vehicles?
Many Volkswagen, Audi, Škoda, SEAT and CUPRA vehicles specify low-viscosity brake fluid meeting VW 501 14.
A “DOT 4” label alone does not confirm suitability for every vehicle. The manufacturer’s exact specification governs. Low viscosity also supports rapid ABS and ESC operation at low temperatures.
Examples of genuine part numbers
| Part number | Pack size |
|---|---|
| B 000 750 M1 | 250 ml |
| B 000 750 M2 | 500 ml |
| B 000 750 M3 | 1 litre |
These are pack sizes, not the prescribed quantity for a fluid change. We verify suitability and any current superseding number in the catalogue for the exact vehicle.
When should the fluid be changed?
The time-based service schedule for the exact vehicle governs. Low mileage is not a reason to postpone the change.
| Service regime | Interval |
|---|---|
| Common interval for many current vehicles | Every 2 years |
| Selected models and service schedules | First change after 3 years, then every 2 years |
| For example Škoda Enyaq and Volkswagen ID. | Every 2 years under the applicable schedule |
The initial three-year interval must not be applied automatically to every new vehicle. Electric vehicles also require regular brake-fluid changes.
Why do we measure the boiling point?
At J&S SERVIS, we check brake fluid condition using an ATE BFT 320, which measures its actual boiling point by heating a sample.
Brake fluid gradually absorbs moisture, lowering its boiling point. Under high brake temperatures, vapour bubbles may form, impairing hydraulic pressure transmission and reducing braking performance.
The instrument displays the measured temperature and a recommendation on whether the fluid should be replaced. We assess the result with regard to measurement accuracy and the service requirements of the specific vehicle.
A boiling point check does not replace the regular brake fluid changes specified by the vehicle manufacturer.
Why does the level gradually fall?
A slight fall can be associated with brake-pad wear. The pistons extend progressively, leaving more fluid in the calipers, so the reservoir level can fall without a leak.
A single need to top up does not by itself prove worn pads. Pad condition and system tightness must be checked. We do not automatically fill to MAX without finding the cause of the lower level.
Repeated topping up requires inspection
Brake fluid is not consumed in normal operation. A repeated or rapid fall can indicate a leak or another fault. Topping up alone does not solve the problem.
J&S SERVIS checks the cause of the loss, brake condition and tightness of the relevant hydraulic system.
Safety warning
With a red low brake-fluid warning or a sudden deterioration in braking effect, do not continue driving; arrange qualified assistance.