Owners of 2016 Jettas describe brake failures ranging from complete loss of stopping power to mushy pedal response. The most serious complaints involve brake pedal going to the floor with no braking action—one owner hit a vehicle at 10–15 MPH, another at highway speed; collisions resulted. A few reports note the pedal travels to the floor without warning in stop-and-go traffic. One owner purchased a vehicle with 34,000 miles and noticed brakes didn't work within days of ownership.
Dealers have diagnosed brake master cylinder failure multiple times. One vehicle had wheel speed sensors replaced twice after ABS warnings and unexpected deceleration at highway speed, but the problem returned. Another owner on a fresh purchase reported "defective brake vacuum and relay" within 400 miles—linked to NHTSA recall 15V705000, though some owners claim their VINs are excluded despite their engines being affected.
ABS, check engine, and tire pressure warning lights often appear together, sometimes with unexplained deceleration in traffic. One owner described the brake failure as producing a loud "boom" noise before sliding into traffic. Another had to use the parking brake to stop the car after the foot brake wouldn't engage. A separate complaint noted the emergency brake button detached, leaving the parking brake inoperable. Dealers have struggled to replicate vibration issues, and some manufacturers did not assist with repairs.
Failure modes owners describe
Brake pedal loss of pressure/failure to engage
Brake pedal travels to floorboard or loses responsiveness entirely; vehicle continues forward without deceleration despite pedal application. Multiple complaints describe complete brake failure in stop-and-go traffic and highway speeds, resulting in collisions.
When: 34,000 miles; 69,000 miles; under 400 miles; variable; recurring
Symptoms owners cite: Brake pedal goes to floor without stopping; Brakes fail to respond when pressed; Vehicle slides or continues forward despite brake application; No warning lights prior to failure
Codes mentioned: P0 (general brake system failure, inferred), Check Engine Light
Repairs/costs cited: Brake master cylinder replacement recommended by dealers; wheel speed sensor replacement performed on recurring ABS-related failure (sensors replaced twice on one vehicle)
Recalls/TSBs owners mention: NHTSA Campaign 15V705000 (brake vacuum pump software update); owner reports vehicle VIN not included in recall despite 1.4L turbo engine being subject to brake vacuum and relay defects; manufacturer stated would respond within specific timeframe but repair status unclear
Brake pedal vibration and inconsistent feel
Strong vibration transmitted through brake pedal when applied; pedal travel inconsistent. Dealer unable to replicate or diagnose root cause despite multiple visits.
When: 7 miles (near new vehicle)
Symptoms owners cite: Strong vibration from braking system when pedal applied; Brake pedal travel to floorboard without warning
Codes mentioned: Brake system fault (unspecified)
Repairs/costs cited: Dealer indicated brake master cylinder failure; vehicle not repaired
Recalls/TSBs owners mention: Manufacturer notified; no specific response documented
Brake vacuum pump and relay defects (check engine light)
Defective brake vacuum and relay component triggers check engine light on new vehicles; identified as safety-critical issue under NHTSA recall campaign but some VINs/engine sizes allegedly not included.
When: Under 400 miles; immediately after purchase
Symptoms owners cite: Check Engine Light illuminated; Brake vacuum system fault
Codes mentioned: Check Engine Light
Repairs/costs cited: Dealer diagnosed defective brake vacuum and relay; software update performed under Campaign 15V705000
Recalls/TSBs owners mention: NHTSA Campaign 15V705000 (brake vacuum pump software update); owner alleges 1.4L turbo engine should be included but is not
ABS/wheel speed sensor malfunction with warning lights
Tire Pressure Monitoring System, ABS, and skid warning indicators illuminate during highway driving; vehicle decelerates unexpectedly. Wheel speed sensor replacement required but failure recurred.
When: 69,000 miles; 87,000 miles
Symptoms owners cite: Tire Pressure Monitoring System warning light; ABS warning light; Skid warning indicator; Unexplained vehicle deceleration in traffic
Codes mentioned: ABS system fault, Wheel speed sensor fault
Repairs/costs cited: Wheel speed sensors replaced (first repair at dealer, second at independent shop); failure recurred after first repair
Recalls/TSBs owners mention: Manufacturer notified of repeated failures; no assistance provided
Engine/electrical issues with brake system interaction
Multiple warning lights (check engine, ABS, TPMS) illuminate simultaneously with loss of power and inability to start. Mechanic suggested transmission but cause unconfirmed. Distinct from direct brake failure.
When: 87,000 miles
Symptoms owners cite: Check Engine Light, ABS light, and TPMS light illuminated; Vehicle jolts during acceleration; Unexpected deceleration; Loss of electrical power; Vehicle will not start
Codes mentioned: Check Engine, ABS system, TPMS
Repairs/costs cited: Independent mechanic suggested transmission as possible cause; vehicle not repaired
Recalls/TSBs owners mention: Manufacturer made aware of failure
Emergency brake (parking brake) failure/malfunction
Emergency brake handle button detached or became non-functional, rendering the parking brake inoperable.
When: Unknown
Symptoms owners cite: Emergency brake handle button came off; Parking brake not functional
Repairs/costs cited: Emergency brake repair needed
Synthesized from 14 NHTSA owner complaints — unverified consumer
allegations, summarized for patterns. The verbatim filings appear below.