Q50 Brakes Lose Pressure

In 2014, the G37 Sedan became Infiniti Q50. G37 Coupe and Convertible became Infiniti Q60 under Infiniti's new naming structure - Here's the place to discuss the Q50 and Q60!
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simmons2k
Posts: 1
Joined: Mon Aug 28, 2023 5:43 pm
Car: 2010 Infiniti M35
2018 Infiniti Q50

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When I apply the brakes to my Q50 it stops fine but while sitting with the brakes applied the peddle loses pressure and slowly goes down.

What causes this?

Thank you!

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VStar650CL
Technical Expert
Posts: 8477
Joined: Thu Nov 12, 2020 1:25 pm
Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S

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Unless it's a hybrid, the only likely cause is that your Master Cylinder is bypassing (seals are shot). When the seals don't hold pressure, fluid leaks past them and back into the reservoir, causing the pedal to gradually drop to the floor.
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audtatious
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Posts: 37008
Joined: Sun Oct 27, 2002 5:31 pm
Car: 2017 Q60 Red Sport. Gone: 2014 Q50s, 2008 G37s coupe, 2007 G35s Sedan, 2002 Maxima SE, 2000 Villager Estate (Quest), 1998 Quest, 1996 Sentra GXE
Location: Stalking You
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I assume it's fixed by now, was the issue the Master Cylinder or a leak somewhere?
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