rear brake spongy
Elite HDF Member
Joined: Nov 2010
Posts: 3,846
Likes: 173
From: Simi Valley, CA
There's only a few things that can cause a spongy pedal... Air in the system, severely contaminated fluid, a leak in the system, either external or internal, or a damaged (weakened) hose that's blowing up like a baloon.
There's a few mechanical issues that could theoretically cause a spongy pedal but they are so unlikely (especially if you haven't taken anything apart) it's not even worth speculating there.
Focus on the hydraulics - that's most likely your problem.
There's a few mechanical issues that could theoretically cause a spongy pedal but they are so unlikely (especially if you haven't taken anything apart) it's not even worth speculating there.
Focus on the hydraulics - that's most likely your problem.
Last edited by 2black1s; Nov 29, 2013 at 05:41 PM.
Elite HDF Member
Joined: Nov 2010
Posts: 3,846
Likes: 173
From: Simi Valley, CA
If you have new fluid and bled the system then you can eliminate those as the causes, provided the bleeding was done properly and thoroughly. I'm assuming during your flushing and bleeding process you also verified no external leakage. So now, if you look at my previous post that only leaves two more options... a defective hose or an internal leak in the master cylinder. My money is on a leak in the master cylinder (assuming everything else you have stated is accurate).
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