Question about 2001 Audi S4

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Audi s4 rear caliper

My 2001 audi s4 driver side rear caliper will not colapse
it just spins around without going in. I am using the brake tool to rotate the piston but it wont colapse. Any ideas

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  • johnblaze101 Dec 07, 2008

    Where can I find the driver side rear caliper and how much?

  • Anonymous Mar 06, 2009

    I have the same problem with my 2004 S4. I've been searching online for an answer and unfortunately this is all I've found.



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I had the same problem with my A6 2000 and I find that I as able to colapse the caliper first after i spun it in the opposite direction retracting it to its full extent. After doing so I was able to retract the caliper spinning it the opposit way,

Hope this can help someone.


Posted on Mar 28, 2009

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Are you sure that the caliper piston is the type that rotates to retract, or is it possibly the type that you have to compress with a C-clamp? If you know for a fact that it is supposed to rotate to retract, then it sounds like your caliper will need replacing. If your brake pads get too low, the metal plate that the pad is secured to will begin to heat up from the friction between the rotor and the plate, causing your caliper to heat up and further causing the piston to expand and seize up. Calipers and heat just don't agree. Anyways, if it won't compress, that's what has happened. The good news is that, although you drive an Audi, brake calipers are usually rather inexpensive, so don't be too upset if you end up replacing it. One word of advise that I always stress though: If there is two of anything on a vehicle, I'll never replace one without replacing the other...just a standard I won't budge on. Not to mention, it's nice to have already done the preventative maintenance and trust'll appreciate your rear calipers being balanced too. Hope this helps! Have a great day!

Posted on Nov 23, 2008


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1. Do not disconnect the brake hose from the caliper, and do not allow the caliper to hang by the brake hose!
2. Remove top and bottom caps (on back side of the caliper) for access to guide pins, then unbolt and remove them from the brake carrier. Remove the caliper.
3. Now you must thoroughly clean the brake calipers (free of grease).
4. Remove outer brake pad from brake carrier.
5. Pull inner brake pad out of brake caliper piston.
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9. Install outer brake pad into brake carrier.
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11. Install both caps.
12. Insert retaining spring into brake caliper housing. Important: Depress the brake pedal firmly several times while the car is stationary so that the brake pads adjust to their normal operating positions!!! Check brake fluid level and top up if neccessary!!!

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