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Audi S5 Sportback Brake Fluid Level Sensors

Audi S5 Sportback Brake fluid level sensors

Starting at $49.95, AutoBuffy stocks 1 brake fluid level sensors from Standard Ignition for the Audi S5 Sportback. This sensor monitors the fluid level in your brake master cylinder reservoir and triggers the dashboard warning light when it drops too low. A failed sensor can leave you blind to a dangerous brake fluid loss or fluid leak, making prompt replacement critical for safe stopping.

Signs your Audi S5 Sportback needs a new brake fluid level sensor

  • Brake warning light stays on continuously even after confirming fluid is at the correct level in the reservoir
  • Brake warning light never illuminates at all, even when fluid is visibly low or the reservoir cap is removed
  • Warning light flickers or pulses erratically while driving on smooth roads, indicating an intermittent electrical fault in the sensor
  • Dashboard shows a brake system fault code related to the fluid level circuit rather than pad wear or ABS
  • Sensor connector shows corrosion, cracking, or moisture intrusion when visually inspected at the reservoir
  • Float inside the reservoir feels stuck, broken, or does not move freely when gently pressed down by hand

Which brake fluid level sensor should you buy for your Audi S5 Sportback?

The primary decision is whether to match the OE sensor design exactly or choose a universal-fit unit that requires minor wiring adaptation. Fit, float type, and connector style must match your Audi S5 Sportback's reservoir, since an incompatible sensor may not seal properly or trigger the warning circuit correctly.

OEM-Equivalent (Direct-Fit)
Best for
Owners who want a plug-and-play replacement with no modification
What you get
Exact connector, float geometry, and resistance values matched to the Audi S5 Sportback's factory reservoir and BCM
Aftermarket Direct-Fit
Best for
Budget-conscious repairs that still need correct fitment without splicing
What you get
Cost savings over dealer pricing while retaining the correct connector and mounting thread; quality varies by brand
Universal Float Sensor
Best for
DIY builders or cases where the direct-fit part is discontinued or back-ordered
What you get
Adjustable float arm and bare-wire leads that must be spliced and calibrated to trigger at the correct fluid level
OEM Dealer Part
Best for
Vehicles still under warranty or where exact match is legally required for fleet/insurance purposes
What you get
Guaranteed factory fit and finish; highest cost but eliminates any compatibility guesswork for the Audi S5 Sportback

Brake fluid level sensors brands we stock for your Audi S5 Sportback

Standard Ignition
1 option · from $49.95

Replacing the brake fluid level sensor on a Audi S5 Sportback

Easy⏱ 30–60 minutesMultimeter (for pre- and post-install testing)Flathead or Phillips screwdriver (for connector retention clip)Clean lint-free rags or shop towelsBrake fluid-safe glovesTurkey baster or fluid transfer pump (to lower fluid level if needed for removal)

Begin by locating the brake master cylinder reservoir under the hood, then unplug the sensor's electrical connector and unthread or unclip the sensor from the reservoir cap or reservoir body. Transfer or absorb a small amount of fluid if necessary to avoid spillage, install the new sensor, reconnect the harness, and confirm the warning light behavior matches the actual fluid level. Always check for fault codes afterward and verify the light extinguishes when fluid is at the correct mark.

Frequently asked questions

How much does it cost to replace brake fluid level sensors on a Audi S5 Sportback?
Parts start at $49.95 for the sensor itself. The total job cost depends on whether you DIY or use a shop. Because the sensor typically threads or clips directly into the reservoir cap or reservoir body, labor is usually under an hour, keeping professional repair costs relatively modest compared to other brake system jobs.
Can I drive my Audi S5 Sportback with a bad brake fluid level sensor?
Driving short distances is possible, but it carries real risk. A faulty sensor can mask an actual drop in brake fluid caused by a leak or worn pads. If fluid loss goes undetected, brake performance can degrade rapidly. Verify actual fluid level manually every trip and replace the sensor as soon as possible.
Will a bad brake fluid level sensor cause my ABS or traction control warning lights to come on?
It can. On many vehicles the brake warning circuit is shared or monitored by the same control module that oversees ABS and stability systems. A sensor sending an erratic or open signal may trigger secondary warning lights. Clearing fault codes and confirming fluid level before condemning the sensor is always the recommended first step.
How do I test a brake fluid level sensor on my Audi S5 Sportback before replacing it?
Use a multimeter set to resistance (ohms). Unplug the sensor connector, remove the sensor, and manually move the float between its low and high positions. The resistance or continuity should change state at the trigger point. A sensor that reads no change, open circuit, or short in both positions is defective and should be replaced.
Is the brake fluid level sensor the same part as the reservoir cap on my Audi S5 Sportback?
Sometimes yes, sometimes no. On many vehicles the sensor is integrated into the reservoir cap as a single assembly, so the cap and sensor are replaced together. On others, the sensor is a separate threaded or clipped unit in the reservoir body. Check your specific reservoir design before ordering to ensure you buy the correct configuration.
How long does a brake fluid level sensor last on a Audi S5 Sportback?
Most sensors last the life of the vehicle under normal conditions, but moisture contamination in degraded brake fluid, vibration, and heat cycling can shorten service life. Sensors in climates with wide temperature swings or vehicles with infrequently changed brake fluid tend to fail sooner due to corrosion of the float and electrical contacts.

Shop brake fluid level sensors by year for the Audi S5 Sportback

20192018

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