How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Jay Your Own Question
Jay, Certified Infiniti Technician
Category: Infiniti
Satisfied Customers: 3692
Experience:  20+years, Nissan and Infiniti experience and currently now working for a Infiniti Dealer
Type Your Infiniti Question Here...
Jay is online now
A new question is answered every 9 seconds

Brakes on 2008 Infiniti are soft and spongy. Sometimes they

Customer Question

Brakes on 2008 Infiniti are soft and spongy. Sometimes they go very low almost to the floor. Pads and rotors are in good condition. What are potential causes?
Submitted: 12 months ago.
Category: Infiniti
Expert:  Jared D replied 12 months ago.

The most common cause of a spongy brake pedal is a bad master cylinder. The master cylinder will bypass internally making it difficult for the system to build up pressure.

The second more common cause is contaminated brake fluid. Contaminants such as water or air in the braking system all compress at a different rate from brake fluid. This causes you to need more brake force at the pedal to compress those contaminants before the brakes are then applied.

Do you hope to diagnose/repair it yourself?