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Recurring spongy pedal 4000 Quattro

Recurring spongy pedal 4000 Quattro

 
Old 10-06-2017, 06:33 AM
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Default Recurring spongy pedal 4000 Quattro

After getting the car back on the road I had a low brake pedal so I pressure bled the whole system. I probably did not do the bleeding in the right order but I found air in the last wheel bled, the right rear. The pedal was fine for about 100 miles and has gotten soft again so I did the RR again and found air again. I am ordering a new set of brake hoses as it seems like a good place to start, I wanted to change them anyway as they are the original lines but does anyone have any other thoughts?
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Old 10-07-2017, 12:02 PM
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Hey folks, after doing a bit of reading I believe that air can leak in thru the piston seal in the caliper so I have purchased a rebuild kit and when I install the new brake line I will also do the caliper rebuild, parts due next week
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Old 12-30-2017, 12:43 PM
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Folks, I have not gotten to rebuilding the rear caliper as the spring on the caliper for the E brake scares me. Does anyone know how to remove this spring from the caliper and more importantly how to reinstall it, it looks like it would be really hard to reinstall without releasing the ebrake tension, advice appreciated, thanks in advance

Last edited by psparky; 07-12-2019 at 04:25 AM.
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Old 07-11-2019, 06:27 AM
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Hello folks, well here it is 18 months later and I still have not moved on. The pedal was getting lower and lower within the last few days so I pressure bled the right rear again and all is good. I never figured out how to remove that caliper without opening pandora's box, I was wondering if I could leave the caliper mounted on the car and just push the piston out using the brake pedal, clean up and replace the seals and put it back together, any ideas out the guys
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