Spongy brakes

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07-11-2021, 02:36 PM

Alkasetser

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Join Date: Sep 2017

Location: Venice fl

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Year: 1999

Model: Cherokee (XJ)

Engine: 4.0

Spongy brakes

I have a 1999 Cherokee sport 2wd. The brakes are super spongy when vehicle is running. I bled the brakes and the pedal is rock hard until the vehicle is started. There is fresh brake fluid, the pads have about half life left, they have been bled. Is it the master cylinder or brake booster? Thank you guys in advance for your help

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07-11-2021, 10:28 PM

lawsoncl

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Year: 1989

Model: Comanche (MJ)

Engine: 4.0

You still have air in the lines. Are they just spongy or is the pedal sinking too?

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07-12-2021, 04:00 AM

country2

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Year: 2000

Model: Cherokee

Engine: 4.0l

Quote:

Originally Posted by lawsoncl

You still have air in the lines. Are they just spongy or is the pedal sinking too?

Booster, since he says good when not running?

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07-12-2021, 02:45 PM

agreen

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Year: 1998

Model: Cherokee (XJ)

Engine: 4L

No. The brakes will still be firm with the booster if there's no air in the lines. You still have air. Pull the drums, check the wheel cylinders for leaks, and reverse bleed with a mityvac.

(Pull the dust boots back a little on the wheel cylinders to check for fluid.)