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The parking brake button is not engaging when the lever is lifted.

(1990 Jaguar XJS)
in Blaine, WA on May 16, 2017
When lifting the parking brake the brakes are certainly being applied but the button is not engaging so the brake will not stay on
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Popular Answer
on May 16, 2017
That is likely a broken spring, or contamination around the ratcheting mechanism causing it not to click in/lock.

Remove the cover for the parking brake, and you will be able to see what is going on, and if you can fix it with a little lubrication.

Let me know if you have further questions on this. It may be a fun little DIY project for you.
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