Brake caliper piston will not compress

Asked by Aug 23, 2014 at 09:21 PM about the 2001 Audi A6 2.7T quattro Sedan AWD

Question type: Maintenance & Repair

Ok, I have been changing brakes for 30 years. Trying to change brakes on Audi. Last week took the calipers off, with C-clamp compressed piston in caliper. Compressed fine. Unfortunately rotors were wrong size, so put all old stuff back on and drove it for a week.

Now took calipers off again, piston will not compress. Why? Took other side off, same issue. Opened bleeder valve, no change. Is there something on this car that will not allow you to compress the piston? I would think by remote chance that piston could lodged or cocked sideways, but piston never extended beyond old brake distance. Any reason why both sides won’t compress?

Got any advice before I dismantle each caliper into pieces?

2 Answers

105,475

What comes to mind is when you collapsed them the first time, the crud that builds up in the calipers over time got sturred up and laid in around the piston seal, the only way to fix this is overhaul the calipers, but if the bore is pitted then replacement is the only option. Make sense or clear as mud?

70,285

I would replace them,even if you get them working,it wont, last to long,if they are all ready sticking.T.S. i think it is mud ; )

Your Answer

Audi A6 Experts

  • #1
    JRKPerformax
    Reputation
    270
  • #2
    Tom Demyan
    Reputation
    230
  • #3
    tenspeed
    Reputation
    210
View All

Related Models For Sale

Used Audi A4
319 Great Deals out of 12,648 listings starting at $1,899
Used Audi A8
66 Great Deals out of 1,797 listings starting at $4,300
Used BMW 5 Series
578 Great Deals out of 15,865 listings starting at $1,650
Used Mercedes-Benz E-Class
719 Great Deals out of 22,934 listings starting at $1,450
Used BMW 3 Series
1,170 Great Deals out of 33,026 listings starting at $1,200
Used Audi S6
8 Great Deals out of 734 listings starting at $4,500
Used Audi S4
50 Great Deals out of 1,613 listings starting at $2,995
Used Mercedes-Benz C-Class
915 Great Deals out of 28,353 listings starting at $2,001
Used BMW 7 Series
120 Great Deals out of 5,233 listings starting at $1,750
Used Mercedes-Benz S-Class
160 Great Deals out of 8,097 listings starting at $1,200

Used Cars For Sale

2018 Audi A6 For Sale
3,312 listings starting at $45,955
2017 Audi A6 For Sale
16 Great Deals out of 729 listings starting at $36,499
2016 Audi A6 For Sale
14 Great Deals out of 426 listings starting at $23,999
2015 Audi A6 For Sale
47 Great Deals out of 718 listings starting at $17,800
2014 Audi A6 For Sale
43 Great Deals out of 651 listings starting at $15,888

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.