# 2013 Hyundai Sonata brakes

**URL:** <https://community.cartalk.com/t/2013-hyundai-sonata-brakes/167205>\
**Category:** Maintenance/Repairs\
**Tags:** hyundai, sonata\
**Created:** [July 12, 2020, 3:26pm UTC](https://community.cartalk.com/t/2013-hyundai-sonata-brakes/167205 "2020-07-12T15:26:57Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![diggity](https://avatars.discourse-cdn.com/v4/letter/d/858c86/32.png) [@diggity](https://community.cartalk.com/u/diggity)\
**Post date:** [July 12, 2020, 3:26pm UTC](https://community.cartalk.com/t/2013-hyundai-sonata-brakes/167205/1 "2020-07-12T15:26:57Z")

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car brakes well with light brake pressure. If car is in park with a little more brake pressure the brake pedal will slowly go down to floor but will repump back to normal position. There are no leaks on calipers, lines or ground. The level of brake fluid in master cylinder does not go down. 58,000 miles

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**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\
**Post date:** [July 12, 2020, 10:03pm UTC](https://community.cartalk.com/t/2013-hyundai-sonata-brakes/167205/2 "2020-07-12T22:03:59Z")

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Two possibilities come to mind. First, a leak in the master cylinder. Second, a bad vacuum booster. Don’t live with it, have it checked out and taken care of.

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**Author:** ![oldnotdeadyet](https://avatars.discourse-cdn.com/v4/letter/o/a6a055/32.png) [@oldnotdeadyet](https://community.cartalk.com/u/oldnotdeadyet)\
**Post date:** [July 14, 2020, 12:38am UTC](https://community.cartalk.com/t/2013-hyundai-sonata-brakes/167205/3 "2020-07-14T00:38:04Z")

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If the fluid is not going down, I would vote for a bad master cylinder. The fluid is leaking backward past the piston, and goes back into the fluid reservoir.