HarvNasty Posted October 17, 2019 Report Share Posted October 17, 2019 Hi All, I don't want to get hosed at the repair shop so I wanted to ask you all. I had to jump on the brakes pretty hard last night after someone ran a red light out in front of me. The brakes engaged, went soft and then a the bottom reengaged as I came to a stop. Now every time I brake their squishy almost all the way down to the floor where I get braking power. - No visible leakes - Brake fluid reservoir still full Ive called a couple places and haven't gotten the same answer twice.... Little help! Thanks All! Steve Quote Link to comment Share on other sites More sharing options...
WWWPerfA_ZN0W Posted October 17, 2019 Report Share Posted October 17, 2019 Most likely booster, blew the diaphragm during that hard stop. FSA/CSP 13N02, warranty extension to 10 years from original date of sale or 150K miles whichever comes first, if your Edge was produced during the defined period. Did the ABS activate at all? Quote Link to comment Share on other sites More sharing options...
Haz Posted October 18, 2019 Report Share Posted October 18, 2019 Attached as PDF... 13N02 - Brake Booster Warranty Extension - 2010 thru 2013 Edge and MKX.pdf 1 Quote Link to comment Share on other sites More sharing options...
WWWPerfA_ZN0W Posted October 18, 2019 Report Share Posted October 18, 2019 Hey there, Haz, haven't seen you around in a bit. Quote Link to comment Share on other sites More sharing options...
mikeyhd Posted February 22, 2020 Report Share Posted February 22, 2020 What I don't understand is why if the booster goes bad, the brakes go soft? To me, it seems the opposite would be the case. The booster multiplies the force applied to the master cylinder, failed booster would mean that the foot now has to apply all of that missing force for the same brake effect. A soft pedal, to me, implies that hydraulics are being bled around seals in the master cylinder or a line has ruptured, or a seal in the caliper is leaking. And that's why I'm an electrician, not an car mechanic. Quote Link to comment Share on other sites More sharing options...
akirby Posted February 22, 2020 Report Share Posted February 22, 2020 Because the failed booster allows pressure to leak from the master cylinder. Quote Link to comment Share on other sites More sharing options...
bb56 Posted February 22, 2020 Report Share Posted February 22, 2020 Slamming on the brakes may have caused a brake pad to stick or the caliper fail with enough space between the caliper piston and the pad to accept a lot of fluid. I had a caliper fail where the ratchet adjustment mechanism would not work and keep the gap very small. The result was soft and squishy brakes! if you examine the calipers in the rear, see if the inner pads have any clearance to the piston. If so, check that out first. When my booster failed, the pedal would sink very low and lose the power assist so I had to push hard and actually pump the brake pedal. The booster also made a noise like an air (vacuum, really) leak when I pressed the pedal. Quote Link to comment Share on other sites More sharing options...
2kool Posted September 1, 2020 Report Share Posted September 1, 2020 After booster and or M/C replacement and soft pedal still exist....take out on dirt road and activate ABS forward and reverse a few times, problem solved! dont spend $14-1,700 dollars at dealer to have HCU replaced when it is just a stuck valve. 1 Quote Link to comment Share on other sites More sharing options...
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